EP4295332B1 - Capteur pour le contrôle de documents de valeur - Google Patents

Capteur pour le contrôle de documents de valeur Download PDF

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Publication number
EP4295332B1
EP4295332B1 EP22708744.2A EP22708744A EP4295332B1 EP 4295332 B1 EP4295332 B1 EP 4295332B1 EP 22708744 A EP22708744 A EP 22708744A EP 4295332 B1 EP4295332 B1 EP 4295332B1
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Prior art keywords
sensor
specific
value document
correction
correction factor
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EP22708744.2A
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German (de)
English (en)
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EP4295332A1 (fr
Inventor
Julia DANHOF
Henning Geiseler
Wolfgang Deckenbach
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Giesecke and Devrient Currency Technology GmbH
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Giesecke and Devrient Currency Technology GmbH
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    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/1205—Testing spectral properties
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/121—Apparatus characterised by sensor details
    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/20—Testing patterns thereon
    • G07D7/2075—Setting acceptance levels or parameters

Definitions

  • the invention relates to a sensor for checking value documents, which is designed to determine a luminescence time constant of a value document, and the provision of a speed correction of the luminescence time constant in the sensor.
  • Sensors are usually used to check valuable documents, which are used to determine the type of valuable document and/or to check the authenticity or condition of the valuable documents.
  • the valuable documents are checked in a device for processing valuable documents, which contains one or more different sensors depending on the properties of the valuable document to be checked. To check the valuable documents, they are usually transported past the stationary sensor.
  • a value document to be checked can have one or more luminescent substances, of which, for example, the decay time of the temporal intensity profile of the luminescence or spectral properties of the luminescence are checked.
  • the luminescent substances of the value document can be present in regions or over the entire surface of or in the value document.
  • To check the decay time of the luminescence it is known to illuminate value documents with light pulses and, in the dark phase between the light pulses, to detect the luminescence intensity of the value document at different times after the end of the excitation pulse. The decay time of the luminescence is then determined from the temporal decay of the luminescence intensity, for example. It is also known to use such a luminescence time constant to authenticate value documents.
  • the disadvantage of the current security document inspection is that in the case of a high transport speed of the security document, a temporal intensity curve of the luminescence is detected that is falsified compared to a statically detected intensity curve. At high transport speeds of the valuable document, the luminescence time constant can therefore only be determined inaccurately
  • DE 10 2010 014912 A1 discloses a device for checking value documents using a luminescence decay time. Suitable luminescence values are selected in order to improve the determined time constant.
  • An object of the present invention is to provide a sensor for checking value documents, by means of which the luminescence time constant of the luminescence of a value document can be checked with improved accuracy at high transport speeds.
  • the detected intensity curve of the luminescence is not distorted by movement effects.
  • a luminescence time constant can then be determined directly from the statically detected intensity curve as a function of time. For stationary value documents, the measured luminescence time constants for different sensor specimens of a sensor series and for the same sensor specimen in different installation positions agree well.
  • the detected intensity curve is distorted due to movement effects.
  • the value document shifts during the measurement by a length that is comparable to the size of the detection and illumination area of the sensor. Since the area of the value document that is excited to luminescence is partially transported out of the (stationary) detection area during detection, this results in a distortion of the measured intensity curve, from which the luminescence time constant is then derived.
  • the actual time constant of the luminescent substance can be determined precisely.
  • the respective sensor is mounted in a measuring station and a reference medium is transported past the sensor at the specified distance in order to measure the intensity of its luminescence.
  • the sensor is calibrated in terms of signal intensity.
  • the sensor according to the invention is designed to test the luminescence of value documents that are transported past the sensor along a transport direction at a test transport speed for their testing.
  • the sensor is designed to measure the temporal change in the luminescence of the value document while the value document is being transported past, and to determine a luminescence time constant of the respective value document based on the measured temporal change in the luminescence.
  • the sensor has at least one excitation light source for exciting a luminescence of the value document, and at least one photodetector for detecting the luminescence of the value document excited by the excitation light source.
  • the sensor is designed to use the photodetector to measure the temporal change in the luminescence of the value document while the value document is transported past the sensor.
  • the sensor has an evaluation device that is designed to determine a luminescence time constant of the value document at the test transport speed based on the measured temporal change in the luminescence of the value document.
  • the evaluation device has, for example, appropriate software.
  • the sensor checks the luminescence time constant, e.g. for an authenticity check of the value document.
  • the security document to be checked has a security feature that contains one or more luminescent substances that emit luminescence.
  • the security feature In response to the luminescence excitation of the excitation light source, the security feature emits luminescence at one or more wavelengths.
  • the luminescence has an intensity curve I(t) with a luminescence time constant t as a function of time t.
  • the luminescence excitation is achieved, for example, by an excitation pulse A that the excitation light source directs at the value document.
  • the intensity curve I(t) then usually shows an increase in the luminescence intensity during the excitation pulse A of the luminescence excitation and a decrease in the luminescence intensity after the end of the excitation pulse of the luminescence excitation.
  • the sensor has a correction device to correct the luminescence time constant with respect to the transport speed of the value document to be checked.
  • a speed correction is provided in the correction device, which corrects a luminescence time constant determined for the respective value document when the sensor checks the luminescence of the value document.
  • One or more sensor-specific parameters are stored in the sensor, which apply individually to the respective sensor, i.e. individually to the respective sensor specimen.
  • the speed correction is contained in the correction device of the sensor.
  • the correction device can be a processor.
  • the speed correction can be carried out by software of the correction device.
  • the correction device In order to correct the luminescence time constant of the value document to be checked with respect to the transport speed, the correction device is set up to determine a sensor-specific correction factor based on the at least one sensor-specific parameter stored in the sensor by means of information about the check transport speed made available to the sensor, which applies to the check transport speed of the value document. For different check transport speeds, Different values are determined for the sensor-specific correction factor depending on the test transport speed.
  • the information about the test transport speed of the value document can be transmitted to the sensor by the value document processing device or determined by the sensor itself through measurement. It can be stored in the sensor.
  • the sensor-specific parameter can be stored in the sensor, e.g. in a memory area of the correction device or in another memory of the sensor outside the correction device.
  • the correction device is designed to correct the luminescence time constant determined for the value document using at least one sensor-specific correction factor applicable to the test transport speed of the value document in order to determine a corrected luminescence time constant for the value document.
  • the luminescence time constant determined for the value document is offset against the sensor-specific correction factor applicable to the test transport speed of the value document, e.g. multiplied or divided.
  • the luminescence time constant determined on the basis of the measured temporal change in luminescence can, if necessary, also be corrected by a further, cross-sensor correction before or after the sensor-specific correction according to the invention is carried out.
  • the sensor in particular the evaluation device, is designed to check the luminescence of the respective value document using the corrected luminescence time constant.
  • the corrected luminescence time constant can be adjusted to one or more values for the respective luminescent substance of the value document. expected reference value(s) or threshold(s), e.g. for authenticating the value document.
  • a sensor-specific correction of the measured luminescence time constant is carried out depending on the transport speed of the value documents.
  • the luminescence time constants corrected in this way which are determined by different sensor units of the same series and/or the same sensor unit in different installation positions, no longer have any movement-related errors and can thus be compared directly with each other and/or with a specified target value of the luminescence time constant.
  • a narrow acceptance range around the target value can be selected - in contrast to luminescence time constants that are falsified due to movement or only corrected across sensors, for which a relatively large acceptance range around the target value must be permitted.
  • the luminescence time constant of the value document to be checked can be determined in the evaluation device of the sensor based on the measured temporal change in the luminescence of the value document to be checked and transmitted to the correction device so that it carries out the speed correction.
  • the corrected luminescence time constant can then be transmitted from the correction device to the evaluation device so that it carries out a check of the value document based on the corrected luminescence time constant.
  • the correction device can be part of the evaluation device of the sensor, which is designed to determine the luminescence time constant of the value document to be checked based on the measured temporal change in the luminescence of the value document to be checked and to check the value document based on the luminescence time constant corrected by the correction device.
  • the correction device can also be present in the sensor, separate from the evaluation device.
  • the sensor-specific parameter is characteristic of or dependent on a (spatial) offset along the transport direction of the value document between the illumination area in which the value document to be checked by the sensor is excited to luminescence or in which the excitation light source of the sensor excites the value document, and a detection area in which the luminescence of the value document to be checked is detected by the sensor or in which the at least one photodetector detects the luminescence of the value document.
  • the illumination area and the detection area are located in the measurement plane of the sensor and are preferably approximately the same size and largely overlap with one another.
  • the sensor-specific parameter is determined based on (at least) one measurement on the sensor (i.e. on the respective sensor specimen) or based on (at least) one measurement using the sensor (i.e. using the respective sensor specimen).
  • the sensor-specific parameter can be determined based on a measurement on the sensor prior to the valuable document check, e.g. by measuring the sensor's offset length relating to the optical structure of the sensor.
  • the sensor-specific parameter can also be determined based on at least one measurement that the sensor itself carries out prior to the valuable document check, e.g. by measuring the luminescence time constant of at least one reference medium using the sensor and calculating a specific sensor-specific correction factor K(v0) or a sensor-specific offset parameter a from the measured luminescence time constant.
  • sensor-individual means that something is individual for the respective sensor specimen, e.g. sensor-individual means Parameter/correction factor that the respective sensor-specific parameter/correction factor is individual, ie unique, for the respective sensor specimen, whereby the sensor-specific parameters/correction factors of the individual (nominally identical) sensor specimens of the same sensor series differ from one another.
  • the sensor-specific parameter(s)/correction factor(s) is/are determined individually for each sensor specimen.
  • the sensor-specific parameter stored in the sensor is determined individually for the respective sensor, ie for the respective sensor specimen, eg before the value document check (eg before delivery of the sensor or when calibrating the sensor in the value document processing device).
  • a correction assignment that applies across sensors e.g. an offset value assignment D or correction table T or correction formula F
  • the correction assignment in particular offset value assignment D or correction table T or correction formula F, applies equally across sensors for all sensors of the same sensor series.
  • the correction assignment assigns an offset-related correction factor to different possible transport speeds of the value document to be checked for different possible sensor-specific offset values of the sensor (e.g. offset lengths d1, d2,... or offset parameters a1, a2,...), which applies to the respective offset value and the respective transport speed.
  • the sensor-specific correction factor is determined based on the correction assignment, in particular offset value assignment D or correction table T or correction formula F, with the help of the sensor-specific parameter stored in the sensor, which is used for the test transport speed of the valuable document, e.g. by selecting the correct correction factor from the table or by calculating using the correction formula.
  • the sensor-specific correction factor K(vP) corresponding to this speed can be easily calculated for all test transport speeds vP.
  • the speed correction of the luminescence time constant is then carried out using the sensor-specific correction factor, which was determined using the correction assignment.
  • the correction assignment stored in the sensor corresponds to a table which - for various possible offset values of the sensor - assigns an offset-related correction factor to several discrete transport speeds, or to a mathematical function which - for various possible offset values of the sensor - assigns an offset-related correction factor to the respective transport speed in at least one continuous interval of transport speeds.
  • the correction assignment specifies the offset-related correction factors for two mutually opposite transport directions of the value document to be checked relative to the sensor, e.g. for positive and negative possible transport speeds and/or for positive and negative offset values.
  • a correction assignment in the form of a table can be determined mathematically by calculating the movement-related temporal change in the overlap between the illumination area and the detection area on the value document, or it can be determined based on measurements of the luminescence time constant of a reference medium using one or more reference sensors (at different transport speeds of the reference medium).
  • the sensor-specific parameter stored in the sensor is a specific sensor-specific correction factor K(v0) that applies individually to the respective sensor and to a reference transport speed v0.
  • the value of the reference transport speed v0 is then also stored in the sensor.
  • it can then be provided to determine the sensor-specific correction factor that applies to the test transport speed of the respective value document to be tested based on the correction assignment and based on the value of the reference transport speed v0 and based on the specific sensor-specific correction factor K(v0) linked to the reference transport speed and by means of the information about the test transport speed of the value document made available to the sensor.
  • the sensor-specific correction factor K(vP) is determined only on the basis of this (exactly one) specific sensor-specific correction factor K(v0) determined with the aid of the (same) sensor specimen for the reference transport speed v0, without using further sensor-specific correction factors applicable to other transport speeds.
  • the sensor-specific parameter stored in the sensor can also be a sensor-specific offset value of the sensor, which is a measure of the sensor-specific (spatial) offset between the illumination area and the detection area of the sensor along the transport direction of the value document.
  • the correction assignment stored in the sensor is preferably an offset value assignment (offset value table D or corresponding mathematical function) which, for several offset values, each contains the offset-related correction factor applicable to the respective offset value as a function of the transport speed. of the value document. Based on the sensor-specific offset value, the sensor-specific correction factor that applies to the test transport speed of the value document to be checked can be determined using the offset value assignment and the information provided to the sensor about the test transport speed of the value document.
  • the sensor-specific offset value is, for example, a sensor-specific offset parameter a, which was determined, for example, based on the specific sensor-specific correction factor K(v0) and the reference transport speed v0 and applies individually to the respective sensor (for the respective sensor specimen).
  • the sensor-specific offset parameter a can have been determined before the value document check (e.g. before delivery of the sensor or when calibrating the sensor in the value document processing device).
  • the sensor-specific offset value can also be a sensor-specific offset length d of the sensor, which indicates the distance along the transport direction of the value document between the illumination area and the detection area of the sensor, e.g. the distance between the center or center of gravity of the illumination area and the center or center of gravity of the detection area.
  • the sensor-specific offset length d stored in the sensor can be determined by measuring the sensor, which is carried out on the sensor with the help of at least one other measuring instrument (e.g. ruler).
  • the provision of the speed correction is carried out for several sensor specimens of the same sensor series, whereby the sensor-specific parameter, in particular the specific sensor-specific correction factor K(v0) or the sensor-specific offset value (e.g. offset parameter a or offset length d), is determined individually for each sensor specimen or applies individually to the respective sensor specimen.
  • the sensor-specific parameters, in particular the specific sensor-specific correction factors K(v0) or the sensor-specific offset values (e.g. offset parameter a or offset length d) differ from one another in sensor specimens of the same sensor series.
  • a speed dependency of a (non-sensor-specific) sensor-wide (ideal) correction factor can also be stored in the sensor, e.g. in the form of discrete value pairs or as a mathematical function that assigns a sensor-wide (ideal) correction factor to several transport speeds of a value document to be checked.
  • the sensor-wide correction factor is used to correct the measured luminescence time constant with regard to the transport speed-dependent shift of the excited area of the value document against the detection area of the sensor, which occurs equally on all sensors in a series.
  • the cross-sensor correction factor applicable to the test transport speed of the value document can be used for the speed correction of the luminescence time constant determined for the respective value document.
  • the sensor-specific correction factor can be calculated using the cross-sensor correction factor or, for the speed correction, the two correction factors (the sensor-specific and the cross-sensor correction factor) are multiplied together.
  • the luminescence time constant determined for the value document is calculated using the sensor-specific correction factor applicable to the test transport speed of the value document and additionally using the correction factor for the test transport speed. of the value document is corrected using the sensor-wide correction factor applicable to the sensor in order to determine the corrected luminescence time constant of the value document.
  • the correction factor that applies across sensors is independent of the offset between the illumination area and the detection area of the respective sensor and would be sufficient to correct the speed of the luminescence time constant - i.e. no sensor-specific speed correction of the luminescence time constant would be necessary - if the sensor had no spatial offset between its illumination area and its detection area along the transport direction of the value document, or exactly the spatial offset that is fixed for the sensor series.
  • the (ideal) correction factor that applies across sensors therefore applies to an ideal sensor that belongs to the same sensor series, but has no offset between an illumination area and a detection area of the sensor, or exactly the specified offset.
  • the correction factor that applies across sensors also applies equally to the other sensors (sensor examples) in the sensor series to which the above-mentioned sensor belongs, and can also be used to correct the speed of the luminescence time constant in the other sensor examples in this sensor series.
  • a single reference medium can be used or several reference media whose measured time constant is averaged to determine the reference medium time constant.
  • These reference media can be specially prepared sheets of paper with luminescent material or genuine valuable documents.
  • the determination of the reference medium time constant of the reference medium can be carried out using the sensor before the sensor is delivered by the sensor manufacturer. This has the advantage that the sensor can be put into operation in various value document processing devices with little effort after delivery. Alternatively, the determination of the reference medium time constant of the reference medium can be carried out after the sensor is delivered when the sensor is calibrated in the value document processing device. This has the advantage that offset-dependent effects that only caused by the installation in the value document processing device, are compensated, thus enabling a particularly precise inspection of value documents by the sensor.
  • the correction device for the speed correction of the luminescence time constant of the respective value document is set up in particular to determine the sensor-specific correction factor K(vP), which applies to the test transport speed vP of the respective value document to be checked, by means of information provided to the sensor about the test transport speed vP of the value document and either on the basis of the value of the reference transport speed v0 stored in the sensor and the specific sensor-specific correction factor K(v0) stored in the sensor, or on the basis of of the sensor-specific offset parameter a stored in the sensor.
  • the sensor-specific offset parameter a of the sensor is a measure of a (spatial) offset along the transport direction of the value document between the illumination area and the detection area of the sensor, and corresponds in particular to the offset length mentioned above.
  • the specific sensor-specific correction factor K(v0) of the sensor is a measure of the reference medium time constant tR(v0) of the reference medium determined in step a3) for the reference transport speed v0.
  • the specified luminescence time constant of the reference luminescent substance tR0 and the reference medium time constant tR(v0) determined in step a3) for the reference transport speed v0 can be related to one another.
  • the target value of the luminescence time constant of the value document to be checked by the sensor deviates from the specified luminescence time constant tR0 of the reference luminescent substance of the reference medium by at most 50%, preferably at most 30%, in order to achieve the most accurate speed correction possible.
  • the luminescence time constant of the value documents to be checked by the sensor at least approximately matches the specified luminescence time constant of the reference medium. This achieves a very accurate speed correction.
  • the specified luminescence time constant tR0 of the reference medium comes from a data sheet or a static measurement of the reference medium.
  • a reference luminescent substance with a time constant of 100 ⁇ s is used for the reference medium
  • a reference luminescent substance with a time constant of 250 ⁇ s is used
  • a reference luminescent substance with a time constant of 900 ⁇ s is used for value document luminescent substances with a time constant between 350 ⁇ s and 5 ms.
  • a reference luminescent substance with a time constant of 250 ⁇ s can also be used for value document luminescent substances with a time constant between 100 ⁇ s and 5 ms.
  • a reference medium is used which has the same luminescent substance as the value documents to be checked with the respective sensor, ie the reference luminescent substance and the value document luminescent substance are the same.
  • At least two different correction assignments e.g. correction tables T, T' or offset value assignments D, D' or correction formulas F, F', are stored in the sensor, which apply to different value ranges of the luminescence time constant of the value documents.
  • the correction device is or will then be set up to select from these different correction assignments (T, T' or D, D' or F, F'), depending on information provided to the sensor about the target value of the luminescence time constant of the value document to be checked, the correction assignment (e.g. T or D or F) in whose value range the target value of the luminescence time constant lies, and to use this correction assignment to determine the sensor-specific correction factor applicable to the test transport speed vP.
  • the specific sensor-specific correction factor K(v0) applicable to the reference transport speed v0 and the reference transport speed v0 are stored in the sensor when the sensor is delivered (but not the sensor-specific offset parameter a).
  • the speed correction can be carried out using the correction table T even without explicitly determining the sensor-specific offset parameter a.
  • the specific sensor-specific correction factor K(v0) is then compared with the correction factors contained in the correction table that apply to the reference transport speed v0 and to various offset parameters (a1, a2, ). And from these, the correction factor that deviates the least from the specific sensor-specific correction factor K(v0) is found.
  • the sensor-specific correction factor K(vP) that applies to the test transport speed is then found, which is in the same table row (i.e. belongs to the same offset parameter a) in which the specific sensor-specific correction factor K(v0) is found. If none of the correction factors contained in the correction table for the reference transport speed v0 corresponds to the specific sensor-specific correction factor K(v0), the values of two table rows can also be offset against one another, e.g. interpolated, to calculate K(vP).
  • the sensor-specific offset parameter a of the sensor to which the correction factor K(v0) selected from the table belongs can be determined and, if necessary, stored in the sensor in order to have it available more quickly for later speed corrections with other transport speeds. If a test transport speed vP is used for which no correction factors are entered in the correction table T, two correction factors from the same table row that apply to different transport speeds can also be offset against one another, e.g. interpolated, to calculate K(vP).
  • the sensor-specific correction factor K(vP) applicable to the test transport speed vP can also be determined via the sensor-specific offset parameter a, which is calculated based on the reference transport speed v0 and the specific sensor-individual correction factor K(v0).
  • the sensor-specific correction factor K(vP) is then determined in step c), e.g. using a correction table T or a correction function F, which applies to the test transport speed vP of the value document (which is different from the reference transport speed v0).
  • the sensor-specific offset parameter a is already stored in the sensor when the sensor is delivered.
  • the table row belonging to this sensor-specific offset parameter a is selected from the correction table T, and in this table row the sensor-specific correction factor K(vP) is selected that applies to the test transport speed of the value document.
  • the sensor-specific offset parameter a does not exactly match one of the possible offset parameters a1, a2, ... in the correction table, the two correction factors of the possible offset parameters (e.g. a1, a2) that deviate the least from the sensor-specific offset parameter a can be offset, e.g. interpolated, in order to calculate a sensor-specific correction factor K(vP) that applies exactly to the sensor-specific offset parameter a.
  • the correction factor that applies to the offset parameter that deviates the least from the sensor-specific offset parameter a is used. If a test transport speed vP is used for which no correction factors are entered in the correction table T, two correction factors applicable to different transport speeds but the same offset parameter a can be offset against each other, e.g. interpolated, to calculate K(vP).
  • a correction formula stored in the sensor can be used to calculate the sensor-specific correction factor K(vP) based on the sensor-specific offset parameter a and on the basis of the test transport speed vP of the value document and on the basis of the sensor-specific correction factor applicable across all sensors for the test transport speed vP of the value document.
  • the cross-sensor correction factor K0(vP) can be calculated, e.g. interpolated, from two cross-sensor correction factors that apply to other transport speeds.
  • only one sensor-specific parameter is or will be stored in the sensor and, in addition, the above-mentioned (non-sensor-specific) correction assignment and, if applicable, the speed dependency of the correction factor that applies across all sensors, but no speed dependency of the sensor-specific correction factor is stored in the sensor.
  • the sensor-specific correction factor K(vP) applicable to the test transport speed vP of the value document - for each test transport speed of the value document - is determined (only) on the basis of exactly this one sensor-specific parameter that was determined with the help of this sensor (sensor specimen), i.e. that no further sensor-specific parameter of this sensor (i.e.
  • the exact one sensor-specific parameter can be the sensor-specific offset parameter a of the sensor or the offset length d of the sensor. Since only this one sensor-specific parameter is required for the speed correction, providing the speed correction is less complex than, for example, if several sensor-specific correction factors have to be determined for different test transport speeds. This is because for the exact one sensor-specific parameter, only a one-time measurement of a reference medium or the offset length is necessary for each sensor specimen.
  • the speed dependency of the sensor-specific correction factor K(v) can, for example, contain the specific sensor-specific correction factor K(v0) and its assignment to the reference transport speed v0. This speed dependency of the sensor-specific correction factor K(v) applies individually to the respective sensor, i.e. to the respective sensor specimen.
  • the assignment can in particular correspond to a table or be a mathematical function.
  • the sensor-specific correction factor K(v) Since exactly the speed dependency that applies individually to this sensor, i.e. to the respective sensor specimen, the sensor-specific correction factor K(v) is stored in the sensor, the determination of the sensor-specific correction factor in the sensor applicable to the inspection transport speed is simplified when checking the valuable documents.
  • no (sensor-wide) correction assignment (e.g. offset value assignment D, correction table T or correction formula F) needs to be stored in the sensor.
  • the above-mentioned correction assignment can be used to find or calculate the speed dependency of the sensor-specific correction factor K(v) applicable to the respective sensor using the measured sensor-specific correction factor K(v0) or the offset parameter a or the offset length d, e.g. by interpolating two table rows.
  • the speed dependency of the sensor-specific correction factor is determined using the individual sensor.
  • the luminescence time constant of a reference medium is measured at different transport speeds using the individual sensor and - using the specified luminescence time constant tR0 of the reference medium - the respective sensor-specific correction factor is calculated as a function of the transport speed.
  • the speed dependency of the sensor-specific correction factor K(v) obtained in this way can be stored in the sensor as a table or formula.
  • the above-mentioned steps a1) to a4) are carried out on the same sensor (sample) one after the other for several different reference transport speeds v0, v1, ... of the reference medium.
  • a specific sensor-specific correction factor K(v0), K(v1), ... is determined for the respective transport speed v0, v1, ... based on a specific reference medium time constant tR(v0), tR(v1), ... of the reference luminescent substance and based on the specified luminescence time constant tR0 of the reference luminescent substance.
  • the speed dependency K(v) of the sensor-specific correction factor is determined from the specific sensor-specific correction factors K(v0), K(v1), ... of the various reference transport speeds v0, v1, ..., e.g. in the form of a table or a mathematical function, through which the sensor-specific correction factor K(v0), K(v1), ... applicable to the respective transport speed is assigned to the various possible transport speeds v0, v1, ... of the value document, and stored in the sensor.
  • the speed dependency K(v) contains the specific sensor-specific correction factors K(v0), K(v1), ... for several possible transport speeds of the value document, i.e. several sensor-specific parameters.
  • the correction device for the speed correction of the luminescence time constant t of the respective value document is set up to determine the sensor-specific correction factor K(vP), which applies to the test transport speed vP of the value document to be checked, based on the speed dependency K(v) of the sensor-specific correction factor stored in the sensor and using the information about the test transport speed vP of the value document made available to the sensor.
  • the sensor-specific correction factors K(v0), K(v1), ... are determined individually for each sensor specimen in accordance with steps a1)-a4).
  • the sensor-specific correction factors K(v0), K(v1), ..., which are contained in the speed dependency K(v) stored in the sensor, apply individually to the respective sensor specimen and differ for different, nominally identical sensor specimens of the same sensor series.
  • the offset parameter a is determined with the aid of the individual sensor and, based on the offset parameter a, the speed dependence of the sensor-individual correction factor K(v) is determined with the aid of the correction assignment (correction table or correction formula) and stored in the sensor.
  • the offset length of the individual sensor is measured and, based on the offset length, the speed dependence of the sensor-individual correction factor K(v) is determined using an offset value assignment (offset value table or a corresponding correction formula) and stored in the sensor.
  • the above-mentioned correction assignment (e.g. offset value assignment D, correction table T or correction formula F) is used to determine the speed dependence of the sensor-specific correction factor K(v), e.g. before delivery of the sensor by the sensor manufacturer, which assigns an offset-related correction factor K1(v0), K1(v1), ..., K2(v0), K2(v1), ... (applicable for the respective offset value d, a and the respective transport speed v) to various possible offset values of the sensor and which may be suitable for the individual sensor.
  • the sensor-specific parameter e.g.
  • the speed dependency K(v) of the sensor-specific correction factor that applies to the respective sensor is determined and stored in the sensor, through which a sensor-specific correction factor K(v0), K(v1), ... is assigned to each of the different transport speeds v0, v1, ....
  • the correction device of the sensor uses the information provided to the sensor about the test transport speed vP and on the basis of the speed dependency stored in the sensor of the sensor-specific correction factor K(v), the correction device of the sensor then determines the sensor-specific correction factor K(vP), which applies to the inspection transport speed vP of the value document.
  • the correction device for correcting the luminescence time constant t of the value document to be checked can be set up to compare the test transport speed vP of the value document with those transport speeds v0, v1, ... for which sensor-specific correction factors K(v0), K(v1), ... are stored in the sensor, in particular in the speed dependency K(v) of the sensor-specific correction factors stored in the sensor. From these transport speeds, the correction device can then select the transport speed (e.g. v1) that corresponds to the test transport speed vP of the value document (is the same as or deviates the least from it), and use the correction factor K(v1) applicable to the selected transport speed (e.g.
  • the correction device can also calculate, e.g. interpolate, the sensor-specific correction factor K(vP) applicable to the test transport speed vP based on at least two of the sensor-specific correction factors K(v0), K(v1), ... stored in the sensor, whose respective associated transport speed v0, v1 deviates the least from the test transport speed vP.
  • the correction device is/is designed to determine the sensor-specific correction factor applicable to the test transport speed as a function of information about the transport direction of the value document to be checked relative to the sensor, along which the value document to be checked is transported past the sensor.
  • At least one correction assignment in particular offset value assignment D or correction table T or correction formula F, can be stored in the sensor, which specifies the offset-related correction factors for two mutually opposite transport directions of the value document to be checked relative to the sensor.
  • the offset-related correction factors for the two mutually opposite transport directions of the value document to be checked can be contained in exactly one correction assignment stored in the sensor (transport directions distinguishable by positive and negative signs of the transport speeds) or in two different correction assignments stored in the sensor, which apply to the two different transport directions of the value document relative to the sensor.
  • the correction device can be configured to select the sensor-specific correction factor that applies to the test transport speed of the value document in this transport direction, based on the at least one correction assignment, using the information about the test transport speed provided to the sensor and using the sensor-specific parameter stored in the sensor (e.g. K(v0), a, d) and depending on information about the test transport direction of the value document to be checked provided to the sensor, and to use this to correct the measured luminescence time constant.
  • the sensor-specific correction factor that applies to the test transport speed of the value document in this transport direction, based on the at least one correction assignment, using the information about the test transport speed provided to the sensor and using the sensor-specific parameter stored in the sensor (e.g. K(v0), a, d) and depending on information about the test transport direction of the value document to be checked provided to the sensor, and to use this to correct the measured luminescence time constant.
  • At least one speed dependency of the sensor-specific correction factor for opposing transport directions of the value document relative to the sensor can be determined and stored in the sensor.
  • exactly one speed dependency of the sensor-specific correction factor can be stored in the sensor be stored (transport directions distinguishable by positive and negative signs of the transport speeds) or two different speed dependencies of the sensor-specific correction factor can be stored in the sensor, which apply to the two different transport directions of the value document relative to the sensor.
  • the correction device can be set up to select, depending on information made available to the sensor about the test transport direction of the value document to be checked relative to the sensor, that of the two speed dependencies of the sensor-specific correction factor that applies to the test transport direction of the value document to be checked, and to determine the sensor-specific correction factor for the value document to be checked based on the selected speed dependency of the sensor-specific correction factor by means of the information made available to the sensor about the test transport speed and to use it to correct the measured luminescence time constant.
  • the correction device is/is configured to determine the sensor-specific correction factor applicable to the inspection transport speed as a function of information provided to the sensor about a target value of the luminescence time constant of the value document to be checked.
  • At least two correction assignments in particular offset value assignments D, D' or correction tables T, T' or correction formulas F, F', can be stored in the sensor, which specify the offset-related correction factors for different value ranges of the luminescence time constant of the value document to be checked.
  • the correction device is/will be set up to use these different correction assignments (D, D' or T, T' or F, F') depending on information provided to the sensor about a target value of the luminescence time constant of the valuable document to be checked, to select the correction assignment (D or D' or T or T' or F or F') in whose value range the target value lies, and to use this correction assignment to determine the sensor-specific correction factor K(vP) applicable to the test transport speed vP.
  • the correction device can be set up to use this selected correction assignment, using the information on the test transport speed made available to the sensor and the sensor-specific parameter stored in the sensor (e.g. K(v0), a, d), to select the sensor-specific correction factor that applies to the test transport speed of the valuable document to which this target value of the luminescence time constant is assigned, and to use this to correct the measured luminescence time constant.
  • the sensor-specific parameter stored in the sensor e.g. K(v0), a, d
  • At least two speed dependencies K(v), K'(v) of the sensor-specific correction factor can be determined and stored in the sensor, to which different value ranges of luminescence time constants of value documents to be checked are assigned or which apply to different value ranges of luminescence time constants of value documents to be checked.
  • the correction device is then set up to select from these speed dependencies K(v), K'(v) that speed dependency (K(v) or K'(v)) of the sensor-specific correction factor in whose value range this target value lies, depending on information provided to the sensor about a target value of the luminescence time constant of the value document to be checked, and to use this to determine the sensor-specific correction factor applicable to the test transport speed.
  • the speed dependencies K(v), K'(v) valid for different value ranges of luminescence time constants can be determined, for example, using several reference media whose specified luminescence time constant tR0 in the respective value range , in particular by measuring the reference medium time constants of the various reference media as a function of the transport speed.
  • the invention also relates to a device for processing value documents, which has the sensor described above.
  • the device has a transport device which is designed to transport the value document to be checked past the sensor along a transport direction at a check transport speed.
  • the device is a sorting device for value documents.
  • the device can have a device that is set up to determine the information about the test transport speed of the value document and whose information about the test transport speed is transmitted to the sensor and thus made available to it.
  • This device can be the control device of the device, which has the information about the test transport speed of the value documents set on the device.
  • the device can also be a speed sensor for measuring the test transport speed of the value document and/or use one or more light barriers for this purpose.
  • the device can also be the user interface of the device, at which the test transport speed of the value documents can be set by an operator of the device.
  • the test transport speed can also be determined by the sensor itself and thus made available, e.g. by means of the photodetector and, if necessary, an additional photodetector of the sensor positioned at a known distance from it, which detect the time interval of one of the edges of the value document transported past.
  • the valuable documents to be checked are, for example, banknotes, checks, ID cards, credit cards, bank cards, tickets, vouchers, etc.
  • the decay time of the luminescence is used as an example for the luminescence time constant.
  • the invention also relates to other luminescence time constants, such as the luminescence rise time or others.
  • Fig. 1 shows, by way of example, the schematic structure of a value document processing device 1 with an input compartment 2, in which a stack of value documents 3 to be processed is provided, and a separator 8, by which one (e.g. the lowest or highest) value document of the input stack is successively captured and sent to a - in the selected representation only schematically shown - transport device 10 (conveyor belts and/or transport rollers) which transports the value documents in the transport direction x past a sensor 25.
  • a separator 8 by which one (e.g. the lowest or highest) value document of the input stack is successively captured and sent to a - in the selected representation only schematically shown - transport device 10 (conveyor belts and/or transport rollers) which transports the value documents in the transport direction x past a sensor 25.
  • the sensor 25 comprises a photodetector 20 which has at least one photosensitive element which converts the luminescence intensities emitted by the value document being transported past into corresponding sensor signals.
  • the photodetector 20 can also have several such photosensitive elements, e.g. for different spectral components of the luminescence light.
  • the sensor 25 can also be designed to check the value documents 3 in one or more measuring tracks on the respective value document, with a photodetector 20 with one or more photosensitive elements being present for each of the measuring tracks.
  • the optical excitation of the value documents takes place, e.g. by means of excitation light sources 23, 24 arranged on both sides of the photodetector 20, which illuminate the value document with excitation light in an illumination area 6, cf.
  • the sensor 25 is arranged on the left side of the transport path, viewed in the transport direction x of the value documents.
  • Another sensor 29 can be arranged opposite the sensor 25, on the right side of the transport path.
  • the photodetector 20 is designed for time-resolved measurement of the luminescence of the value documents during or after the end of the optical excitation.
  • the photodetector forwards the sensor signals detected from the measuring location of the value documents to be checked to an evaluation device 22 of the sensor.
  • the evaluation device 22 can be contained in the housing of the sensor 25 or outside of it, e.g. in a central evaluation device of the value document processing device 1.
  • the evaluation device 22 determines the luminescence time constant t(vP) based on the detected sensor signals.
  • One or more sensor-specific parameters are stored in a memory area 26 of the evaluation device 22 - depending on the embodiment, either the sensor-specific correction factor K(v0) or the offset parameter a or the offset length d or the speed dependence of the sensor-specific correction factor K(v).
  • a correction device 21 of the evaluation device 22 can access the information stored in the memory area 26 in order to use it for the speed correction of the luminescence time constant.
  • Further information can be stored in the memory area 26, such as information about the test transport speed vP of the value documents, which can vary depending on the type or setting of the value document processing device 1.
  • one or more tables and/or one or more mathematical functions can also be stored in the memory area 26, which are used in the speed correction of the luminescence time constant, cf. the following embodiments.
  • the luminescence time constant t*(vP) corrected by the correction device 21 is then used by the evaluation device 22 as a test criterion for the value documents, in particular for assessing the authenticity of the value documents.
  • the switches 11 and 12 along the transport path are controlled by the control device 50 in such a way that the value document is transported to one of the output compartments 30, 31 of the value document processing device 1.
  • value documents that have been identified as genuine are deposited in a first output compartment 30, while value documents classified as fake or suspected of being forged are deposited in a second output compartment 31.
  • further output compartments and/or other devices for example for storing or destroying value documents, can be provided, such as cassettes for the protected storage of the value documents or a shredder. If, for example, a value document could not be recognized, a special output compartment can be provided for it, in which such value documents are deposited and made available for special treatment, for example by an operator.
  • the value document processing device 1 further comprises an input/output device 40 for the input of data and/or control commands by an operator, for example by means of a keyboard or a touch screen, and output or display of data and/or information on the processing process, in particular on the value documents being processed in each case.
  • an input/output device 40 for the input of data and/or control commands by an operator, for example by means of a keyboard or a touch screen, and output or display of data and/or information on the processing process, in particular on the value documents being processed in each case.
  • FIGs 2a-c the temporal behavior of the luminescence of a value document is shown, which is emitted by a luminescent security feature of the value document.
  • a static measurement is carried out, for example, during a manual inspection of individual valuable documents.
  • the luminescence is detected at three detection times t1, t2, t3, cf.
  • t0 250 ⁇ s.
  • different sensor examples 25a, 25b of the same sensor series deliver the same measurement result of the luminescence time constant.
  • the relative movement of the value document relative to the sensor 25 causes a shorter decay time ta to be determined than in the static case. This results from the fact that the value documents are moved further by a certain length during detection, which is comparable to the size of the detection and illumination area.
  • the position of the illumination area on the value document thus changes during the measurement, and the measured intensity curve at the detector corresponds to a convolution of the temporal behavior of the luminescent substance and the movement-related change in the overlap between the illumination area and the detection area on the value document.
  • very different decay times ta, tb are determined for the same value document at a test speed vP ⁇ 0.
  • one or more sensor-specific parameters are used for the speed correction of the luminescence time constant, which are individually applicable to the respective sensor specimen.
  • the determination of the sensor-specific parameter(s) is carried out, for example, before the sensor is delivered by the sensor manufacturer or after the sensor is delivered to the customer in the case of an occasional
  • the sensor can be installed in the value document processing device or in a specially designed sensor measuring station. During the calibration, the respective sensor can also be adjusted with regard to the detected intensity, for example.
  • a single, specific sensor-specific correction factor K(v0) is used as the sensor-specific parameter, which is determined using a reference medium transported past the sensor.
  • the reference medium is provided with a reference luminescent substance and is, for example, sheet-shaped.
  • the determination of the specific sensor-specific correction factor K(v0) is carried out by the sensor manufacturer or - after delivery of the sensor - when calibrating the sensor installed in the value document processing device.
  • the reference medium is transported past the respective sensor specimen once at a reference transport speed v0.
  • a time-resolved measurement of the luminescence emitted by the reference luminescent substance is detected using the sensor's photodetector 20. From the measured temporal change in the luminescence of the reference medium, a reference medium time constant tR(v0) of the reference luminescent substance for the reference transport speed v0 is determined.
  • the specific sensor-specific correction factor K(v0) which was determined individually for the respective sensor, is stored in the memory area 26 of the evaluation device 22 and assigned there to the reference transport speed v0, the value of which is also stored in the memory area 26.
  • a cross-sensor correction assignment e.g. a correction table T or a correction formula F, is stored in the memory area 26 of the respective sensor.
  • a correction table T for the speed correction of the luminescence time constant is created, which can be used for all sensor examples of this sensor series and which is then stored in the memory area 26 of the respective sensor 25 together with the specific sensor-individual correction factor K(v0).
  • an ideal reference sensor 25R4 is used, for example, which is known to have no offset between its illumination and detection range.
  • the above-mentioned reference medium is transported past the reference sensor 25R4 at various transport speeds v and a time-resolved measurement of the luminescence emitted by the reference luminescent substance is detected using the photodetector 20 of the reference sensor.
  • the reference medium time constant tR(v) of the reference luminescent substance is determined for the respective transport speed v from the measured temporal change in the luminescence of the reference medium.
  • the correction factors given therein apply to a sensor of this sensor series that has no spatial offset between its illumination area and its detection area.
  • a reference sensor is used in which the offset exactly corresponds to the predetermined offset, and a correction table is created whose correction factors apply to a sensor (ideal for the sensor series) whose offset between the illumination area and the detection area exactly corresponds to the predetermined offset.
  • Table 2 shows the correction table T determined in this way, which specifies the offset-related correction factors K1(v0), K1(v1), ..., K2(v0), K2(v1), ... for seven different reference sensors.
  • the correction table T can also be determined by a mathematical simulation of the detection process of the sensor, which is based on the temporal course of the luminescence intensity of the luminescent substance and from which the movement-related temporal change of the overlap between the illumination area and the detection area on the value document is calculated.
  • the correction table can also contain only the purely offset-related portion Bi(v) of these correction factors, from which the ideal correction factors K0(v) (applicable to an offset-free sensor) are calculated.
  • a correction table with the purely offset-related correction factors Bi(v) for various Reference sensors are stored and additionally the speed dependence of the ideal correction factor K0(v), see Table 1.
  • the sensor specimens 25a, 25b with the specific sensor-individual correction factor K(v0) stored therein and the correction table T stored therein are then delivered by the sensor manufacturer to the customer who uses the respective sensor, e.g. in a value document processing device.
  • the reference sensor is selected whose correction factor at the reference transport speed v0 corresponds to the specific sensor-specific correction factor K(v0) of the respective sensor specimen or deviates from it the least.
  • these correction factors can be used as sensor-specific correction factor K(vP) of the respective sensor specimen.
  • the correction factors of the two reference sensors whose correction factors Ki(v0), Kj(v0) deviate the least from the specific sensor-specific correction factor K(v0) at the reference transport speed v0 can alternatively be used to determine the sensor-specific correction factor K(vP).
  • these are reference sensors 25R4 and 25R5
  • these are reference sensors 25R1 and 25R2.
  • the two correction factors of these two reference sensors belonging to the transport speed vP are interpolated in order to determine the sensor-specific correction factor K(vP) more precisely.
  • test transport speed vP does not exactly match one of the transport speeds v contained in the correction table, the corresponding correction factors of the two transport speeds v closest to the test transport speed vP can be interpolated from the correction table T.
  • the respective sensor specimen 25a, 25b can carry out the speed correction of the measured value on the value document to be checked.
  • a mathematical correction formula F is stored in the individual sensors 25a, 25b of the sensor series, which specifies a family of possible speed dependencies of the correction factor K(vP) for various offset parameters a.
  • the correction formula F can be determined by the sensor manufacturer, for example using the correction table T (for example by adapting a fit function to the table values) or by mathematical simulation.
  • the correction formula K vP K0 vP ⁇ 1 + a ⁇ arctan ( vP/3 which indicates the speed dependence of the correction factor K(vP) as a function of the offset parameter a and as a function of the test transport speed vP of the value document.
  • the offset parameters a applicable to the reference sensors 25R1 - 25R7 are given in the first column of Table 2. For other sensor series, other correction formulas generally apply.
  • the calculation of a using the formula F* can be carried out by the sensor manufacturer or after delivery of the sensor.
  • the sensor-specific offset parameter a is also stored in the memory area 26 of the respective sensor specimen 25a, 25b in order to have it available for later speed corrections with other test transport speeds vP.
  • the sensor-specific correction factor K(vP) applicable to the test transport speed is calculated using the correction formula F before the value document is checked in a value document processing device.
  • the above-mentioned sensor-specific offset parameter a is used as the sensor-specific parameter and before delivery of the sensor in the memory area 26 of the sensor 25, together with a correction assignment that applies across all sensors, e.g. the correction table T or the correction formula F.
  • the sensor-specific offset parameter a of the sensor can - as described in the first embodiment - be calculated using the formula F* from the specific sensor-specific correction factor K(v0), which - as in the first embodiment - is determined by measuring the luminescence time constant of the reference medium transported past the sensor at the reference transport speed v0.
  • the correction table T described in the first embodiment is also stored in the sensor copies 25a,b, which specifies the offset-related correction factors Ki(v) for sensors of the sensor series of the sensor 25 as a function of the offset parameter a and as a function of the transport speed v of the value document.
  • the correction formula F can also be stored in the sensor copies 25a,b - in addition to the sensor-specific offset parameter a - which specifies the speed dependence of the correction factor K(v) as a function of the sensor-specific offset parameter a and as a function of the transport speed v of the value document for sensors of this sensor series.
  • the sensor with the sensor-specific offset parameter a stored therein and the correction table T or correction formula F stored therein is then delivered by the sensor manufacturer to the customer, who uses this sensor to carry out the value document check with a value document processing device.
  • the inspection transport speed vP of the value document is required. This can be transmitted to the sensor by the value document processing device and, if necessary, stored in the sensor.
  • the correction device 21 of the sensor uses the sensor-specific offset parameter a of the sensor and the correction table T to then determine the sensor-specific correction factor K(vP) that applies to the test transport speed vP of the value document and the sensor-specific offset parameter a of the sensor.
  • the sensor-specific offset parameter a of the respective sensor does not exactly match one of the possible offset parameters of the correction table T, the two correction factors of the possible offset parameters that deviate the least from the sensor-specific offset parameter a can be interpolated from the correction table T.
  • the test transport speed vP does not exactly match one of the transport speeds v contained in the correction table, the corresponding correction factors of the two transport speeds v closest to the test transport speed vP can be interpolated from the correction table T.
  • the sensor-specific correction factor K(vP) applicable to the sensor-specific offset parameter a of the sensor and to the inspection transport speed vP of the value document can be precisely calculated.
  • the speed dependence of the correction factors K0(v) applicable to the ideal reference sensor 25R4 is preferably also stored in the sensor (see Table 1). From this, the ideal correction factor K0(vP) is selected which is suitable for the
  • the correction device 21 of the sensor uses the correction formula F to calculate the sensor-specific correction factor K(vP) based on the sensor-specific offset parameter a, which applies to the test transport speed vP of the value document and the sensor-specific offset parameter a of the sensor.
  • the sensor-specific offset length d of the sensor is used as the sensor-specific parameter and is stored in the memory area 26 of the sensor 25 before delivery of the sensor, together with an offset value assignment that applies across all sensors.
  • the sensor 25 is then delivered to the customer with the offset length d stored therein and the offset value assignment, who uses this sensor to carry out the value document check in a value document processing device 1.
  • the sensor-specific offset length d is the distance measured along the transport direction of the value document in the measuring plane between the illumination area in which the value document to be checked by the sensor is excited to luminescence and the detection area in which the sensor detects the luminescence of the value document to be checked.
  • the distance between the center or centroid of the illumination area and the center or centroid of the detection area is used as the offset length d.
  • Fig. 3 four possible combinations of illumination area 6 and detection area 9 and their centers or focal points 7 and 4 respectively are shown.
  • the sensor manufacturer can position a flat projection surface (screen) in the measuring plane of the sensor, which is parallel to the sensor surface and is at the distance from the sensor surface at which the valuable documents are transported past the sensor when checking the valuable documents (measurement plane).
  • the excitation light sources of the sensor are then switched on and the illumination area illuminated by them is marked on the flat projection surface.
  • the detection area is then determined by illuminating only individual sections of the illumination area one after the other and observing the detected signal in each case: If a minimum signal is detected from there, the illuminated section belongs to the detection area, otherwise not.
  • the center or center of gravity 7 of the illumination area 6 and the center or center of gravity 4 of the detection area 9 are determined, marked, and their distance along the transport direction x is measured, which is used as the sensor-specific offset length d.
  • the offset value table D can also be determined by mathematical simulation.
  • the offset value table D is stored in the sensor.
  • the sensor-specific correction factor K(vP) that applies to the test transport speed vP of the valuable document is determined during the valuable document inspection based on the offset value table D and the information made available to the sensor about the test transport speed vP and the offset length d of the sensor.
  • the sensor-specific correction factor K(vP) can be taken directly from the offset value table D or calculated by interpolating the table values.
  • a corresponding mathematical correction formula for a family of curves K(v,d) can also be generated (e.g. by fitting the table values) and stored in the sensor and used to calculate K(vP) based on the offset length d and the test transport speed vP.
  • the correction factors Ki(v) of the offset value table D shown in Table 3 allow a complete movement-related correction of the luminescence time constant.
  • the offset value table D can also contain only the purely offset-related part Bi(v) of these correction factors, from which the ideal correction factors K0(v) (applicable to an offset-free sensor) are eliminated, see Table 4.
  • An offset value table D is then stored in the sensor with the purely offset-related correction factors Bi(v) for different offset lengths d1, d2, ... and additionally the speed dependence of the ideal correction factor K0(v), see Table 1.
  • the offset length d stored in the relevant sensor can then be used to select (or calculate by interpolation) the purely offset-related sensor-specific correction factor B(vP) of the relevant sensor based on this offset value table D, which applies to the inspection transport speed vP of the value document.
  • Table 4 Offset value table D with purely offset-related correction factors Bi(v) for sensors of the sensor series of sensor 25 with different offset lengths d for opposite transport directions of the value document offset [mm] speed [m/s] -12 -8 -4 0 4 8 12 -0.5 correction factor 1.09 1.08 1.06 1.00 0.94 0.92 0.91 0.0 correction factor 1.00 1.00 1.00 1.00 1.00 1.00 1.00 0.5 correction factor 0.91 0.92 0.94 1.00 1.06 1.06 1.09 1.0 correction factor 0.82 0.83 0.87 1.00 1.13 1.17 1.18 1.5 correction factor 0.73 0.75 0.81 1.00 1.19 1.25 1.27
  • the ideal correction factor K0(vP) is selected from the speed dependence of the ideal correction factor K0(v), which applies to the test transport speed vP of the value document.
  • sensor-specific parameters are calculated in the form of a speed dependency of the sensor-specific correction factor K(v) is determined and stored in the sensor.
  • the sensor, with the speed dependence of the sensor-specific correction factor K(v) stored therein, is then used to check valuable documents with a valuable document processing device.
  • the speed dependence of the sensor-specific correction factor K(v) is determined in the fourth embodiment by measuring the luminescence time constant of a reference medium at different transport speeds v with the aid of the respective sensor specimen, in which the speed dependence of the sensor-specific correction factor is then stored.
  • each sensor specimen is individually calibrated using a reference medium that is transported past the respective sensor specimen at different transport speeds v0, v1, ... This can be carried out by the sensor manufacturer before the sensor is delivered, e.g. at a suitable sensor measuring station, or only during or after the sensor is put into operation in the respective value document processing device.
  • the specified luminescence time constant tR0 of the reference medium preferably corresponds to the target value of the luminescence time constant t0 of the value documents to be checked.
  • a time-resolved measurement of the luminescence emitted by the reference luminescent substance is detected with the photodetector 20 of the sensor. From the measured temporal change in the luminescence of the reference medium, a reference medium time constant tR(v) of the reference luminescent substance is determined for the respective transport speed v. Based on the respective determined reference medium time constant tR(v) of the reference luminescent substance and based on the specified luminescence time constant tR0 of the reference luminescent substance, a sensor-specific correction factor K(v) is determined for the respective transport speed v1, v2, e.g.
  • the respective sensor-specific correction factor K(v) is assigned to the respective transport speed v0, v1, ..., as shown, for example, in Table 5.
  • Table 5 Speed dependence of the sensor-specific correction factor for sensor specimen 25a speed v [m/s] 0 2 3 4 5 6 7 8 9 10 correction factor K(v) 1 1.12 1.19 1.27 1.37 1.47 1.58 1.70 1.83 1.99
  • a mathematical function can also be stored in the respective sensor as the speed dependency K(v) of the sensor-specific correction factor, which continuously specifies values for the correction factor K(v) in a speed range (e.g. from 0 m/s to 12 m/s), e.g. for a third sensor example 25c, a fitting function G(v) which is fitted to the measured discrete values K(v0), K(v1), ... (cf. Fig. 2e ).
  • the correction device 21 of the respective sensor contains a speed correction which is used when checking the luminescence of the value documents to correct the luminescence time constant t determined for the respective value document.
  • the speed correction uses the speed dependency K(v) of the sensor-specific correction factor stored in the respective sensor, ie for sensor example 25a on Table 5, for sensor example 25b on Table 6 and for sensor example 25c on the fit function G(v).
  • test transport speed vP of the valuable documents matches one of the discrete transport speeds v0, v1, ... in Table 5 or 6 stored in the sensor. If a correction factor K(vP) is not explicitly stored in the sensor for the test transport speed vP of the respective valuable document processing device 1, it is possible, for example, to find out which of the stored transport speeds deviates the least from the test transport speed vP of the valuable documents.
  • the sensor-specific correction factor K(vP) assigned to this transport speed is then used to correct the decay time. This can be done under the proviso that the speed deviation is below a certain threshold, e.g. ⁇ 10%.
  • the test transport speed vP of the value documents deviates more than acceptable from all transport speeds v0, v1, ... stored in the sensor
  • at least two transport speeds v1, v2 are selected from the transport speeds stored in the sensor, e.g. those that deviate the least from the test transport speed vP, and the two sensor-specific correction factors K(v1), K(v2) assigned to them.
  • the sensor-specific correction factor K(vP) applicable to the test transport speed vP is determined from the at least two selected sensor-specific correction factors K(v1), K(v2), e.g. by interpolation.
  • sensor-specific parameters are also determined in the form of a speed dependency of the sensor-specific correction factor K(v) and stored in the memory area 26 of the sensor 25.
  • the sensor with the speed dependency of the sensor-specific correction factor K(v) stored therein is then used in a value document processing device for checking value documents.
  • the speed dependency of the sensor-specific correction factor K(v) is determined on the basis of a measurement of the luminescence time constant tR(v0) of a reference medium at just one reference transport speed v0 using this same sensor in which the speed dependency of the sensor-specific correction factor is stored.
  • the line (the reference sensor) is selected from the above-mentioned correction table T in which the correction factor in the column for v0 takes the value K(v0) determined for the individual sensor.
  • This line selected from the correction table T corresponds to the speed dependency of the sensor-specific correction factor K(v) and is stored in the sensor.
  • K(v0) does not exactly match a value in the correction table T in the column for v0
  • a line interpolated from the two closest lines can be determined and stored in the respective sensor as a speed dependency of the sensor-specific correction factor K(v). This can be done by the sensor manufacturer or after delivery of the sensor, for example when calibrating the sensor in the value document processing device.
  • the speed dependence of the sensor-specific correction factor K(v) can then be calculated using the formula F and stored in the sensor.
  • the sensor with the speed dependence of the sensor-specific correction factor K(v) stored in it is then used in a valuable document processing device for valuable document checking.
  • F - at least one further correction assignment T', F' can be determined using a different reference medium with a different luminescence time constant, which applies to value documents with a different target value of the luminescence time constant.
  • one or more further speed dependencies K'(v), K"(v) of the sensor-specific correction factor can be determined and stored in the sensor, each of which applies to a different value range of the luminescence time constant of the value documents to be checked.
  • several sensor-specific parameters are also determined in the form of a speed dependency of the sensor-specific correction factor K(v) and stored in the sensor, preferably before the sensor is delivered.
  • the sensor is then delivered to the customer with the speed dependency of the sensor-specific correction factor K(v) stored therein, who uses this sensor to carry out the value document check in a value document processing device.
  • the speed dependency of the sensor-specific correction factor K(v) is determined by measuring the offset length d of this very sensor (i.e. sensor specimen) in which the speed dependency of the sensor-specific correction factor is stored.
  • the speed dependency of the sensor-specific correction factor K(v) is determined using the offset value table D (or a corresponding correction formula), by finding the table row of the offset value table D that belongs to the offset length d, see Table 3 or 4, or by interpolating the two rows whose offset lengths are closest to the offset length d.
  • the speed dependency of the sensor-specific correction factor K(v) determined in this way is then stored in the memory area 26 of the sensor 25.
  • the sensor is then delivered to the customer, who carries out the value document verification, with the speed dependence of the sensor-specific correction factor K(v) stored in it.
  • the offset length of each individual measuring track is measured. If the correction device 21 uses measured values of the value document from several tracks to determine the luminescence time constant of the value document, the measured luminescence time constants can first be corrected depending on the measuring track and then combined to form a resulting luminescence time constant t(vP). Alternatively, an effective offset length can be calculated from the individual offset lengths of the various measuring tracks. To do this, the offset lengths of the various measuring tracks are weighted in the same way that the correction device 21 weights the luminescence time constants of the individual measuring tracks to determine the resulting time constant. To determine the speed dependency of the sensor-specific correction factor K(v), this effective offset length is then used as the offset length d of the sensor.
  • a separate speed dependency of the sensor-specific correction factor is stored for both opposite transport directions of the value documents relative to the sensor in the memory area 26 of the sensor 25. For example, for the transport direction in which the sensor - viewed along the transport direction of the value documents - is located on the left side of the transport path, a first speed dependency Kl(v) of the sensor-specific correction factor is stored in the sensor (negative speed values).
  • a second speed dependency Kr(v) of the sensor-specific correction factor is stored in the sensor (positive speed values).
  • the first speed dependency Kl(v) of the sensor-specific correction factor applies to the Figure 1 shown installation position of the sensor 25 in the value document processing device 1.
  • the second speed dependence Kr(v) of the sensor-specific correction factor applies to a different installation position in which the sensor 25 is installed on the opposite side, instead of the sensor 29 in the value document processing device 1, cf. Fig. 1 .
  • Tables 9 and 10 show the two speed dependencies Kl(v) and Kr(v) of the sensor-specific correction factor for the third sensor specimen 25c of the above-mentioned sensor series.
  • Table 9 Speed dependence Kl(v) of the sensor-specific correction factor for sensor specimen 25c in the left installation position speed v [m/s] -12 -8 -4 0 decay time tR [ ⁇ s] 135 178 229 250 correction factor Kl(v) 1.85 1.40 1.09 1.00 speed v [m/s] 0 4 8 12 decay time tR [ ⁇ s] 250 177 128 93 correction factor Kr(v) 1.00 1.41 1.95 2.69
  • Figure 2e shows a mathematical function G(v) which was determined on the basis of the two speed dependencies Kl(v) and Kr(v) for the third sensor specimen 25c.
  • Fig. 2e The sensor-specific correction factors for the sensor specimens 25a and 25b are also shown.
  • the procedure can be as in the fourth, fifth or sixth embodiment, but for both mutually opposite transport directions of the value document relative to the sensor.
  • the reference medium (with a known specified luminescence time constant tR0) can be transported past the sensor along both opposite transport directions at different transport speeds v0, v1, ... and the decay time tRl(v0), tRl(v1), ..., tRr(v0), tRr(v1), ... can be determined in each case.
  • the sensor-specific correction factors K1(v0), K1(v1), ..., Kr(v0), Kr(v1), ... for several transport speeds v0, v1, ... along the first transport direction and along the second transport direction are then determined from the respective measured decay times.
  • the correction device receives 21 information about the test transport direction of the value documents relative to the sensor, eg from the control device 50, which also transmits the information about the test transport speed vP.
  • the information about the test transport direction can be transmitted explicitly or simply by the sign of the transport direction from the control device, eg negative speed values for the Fig. 1 shown transport direction (or when the sensor 25 is installed on the left), positive speed values for the opposite transport direction (or when the sensor is installed on the right).
  • the correction device 21 selects either the first speed dependency of the correction factor Kl(v) or the second speed dependency of the correction factor Kr(v) depending on the information about the test transport direction made available to the sensor 25. Based on the selected first or second speed dependency of the sensor-specific correction factor Kl(v), Kr(v) and by means of the information about the test transport speed vP made available to the sensor, the correction device 21 determines the sensor-specific correction factor Kl(vP) or Kr(vP) that applies to the test transport speed vP and the test transport direction of the value documents.

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Claims (18)

  1. Procédé permettant de fournir une correction de vitesse d'une constante de temps de luminescence d'un document de valeur dans un capteur (25) qui est conçu pour mesurer une variation dans le temps d'une luminescence du document de valeur pendant que le document de valeur respectif est transporté devant le capteur, et qui est conçu pour déterminer la constante de temps de luminescence du document de valeur respectif à l'aide de la variation dans le temps mesurée de la luminescence et pour contrôler la luminescence du document de valeur respectif, comprenant les étapes consistant à :
    a) déterminer au moins un paramètre propre au capteur (K(v0), a, d) à l'aide d'une mesure au niveau du capteur ou à l'aide d'une mesure à l'aide du capteur,
    b) mémoriser ledit au moins un paramètre propre au capteur (K(v0), a, d) dans le capteur (25),
    c) fournir une correction de vitesse qui est utilisable lors du contrôle de la luminescence d'un document de valeur transporté devant le capteur (25) à une vitesse de transport de contrôle (vP) pour corriger une constante de temps de luminescence (t(vP)) déterminée pour le document de valeur respectif dans un dispositif de correction (21) du capteur, dans lequel le dispositif de contrôle pour la correction de vitesse de la constante de temps de luminescence (t(vP) du document de valeur respectif sera conçu pour
    - déterminer, sur la base dudit au moins un paramètre propre au capteur (K(v0), a, d) mémorisé et au moyen d'une information fournie dans le capteur concernant la vitesse de transport de contrôle (vP) du document de valeur, un facteur de correction propre au capteur (K(vP)) qui est valable pour la vitesse de transport de contrôle (vP) du document de valeur à contrôler respectivement, et
    - corriger la constante de temps de luminescence (t(vP)) déterminée pour le document de valeur, à l'aide du facteur de correction propre au capteur (K(vP)) valable pour la vitesse de transport de contrôle (vP) du document de valeur afin de déterminer une constante de temps de luminescence corrigée (t*(vP)) pour le document de valeur,
    dans lequel le capteur est réalisé pour contrôler la luminescence du document de valeur respectif à l'aide de la constante de temps de luminescence corrigée (t*(vP)).
  2. Procédé selon la revendication 1, caractérisé en ce que
    - dans le capteur est mémorisée une dépendance de la vitesse (K0(v)) d'un facteur de correction (K0(v0) , K0(v1), ...) valable pour tous les capteurs qui attribue à différentes vitesses de transport possibles d'un document de valeur à contrôler (v0, v1, ...) respectivement un facteur de correction valable pour tous les capteurs (K0(v0), K0(v1), ...), et
    - le facteur de correction valable pour tous les capteurs (K0(vP)) valable pour la vitesse de transport de contrôle (vP) du document de valeur respectif est utilisé pour la correction de vitesse de la constante de temps de luminescence (t(vP)) déterminée pour le document de valeur respectif.
  3. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que dans le capteur (25) est mémorisée au moins une attribution de correction (D, T, F), en particulier une attribution de valeur de décalage (D) ou une table de correction (T) ou une formule de correction (F) qui attribue pour différentes valeurs de décalage propres aux capteurs (a1, a2, ..., d1, d2, ...) possibles du capteur respectivement à différentes vitesses de transport (v) possibles d'un document de valeur à contrôler respectivement un facteur de correction dû au décalage, et en ce que lors de la correction de vitesse il est prévu de
    - déterminer à l'aide de l'attribution de correction (D, T, F), en particulier à l'aide de l'attribution de la valeur de décalage (D) ou d'une table de correction (T) ou d'une formule de correction (F), à l'aide du paramètre propre au capteur (K(v0), a, d) mémorisé dans le capteur, le facteur de correction propre au capteur (K(vP)) qui est valable pour le paramètre propre au capteur (K(v0), a, d), mémorisé dans le capteur, du capteur et pour la vitesse de transport de contrôle (vP) du document de valeur, et
    - effectuer la correction de la constante de temps de luminescence (t(vP)) du document de valeur à l'aide du facteur de correction propre au capteur (K(vP)) valable pour la vitesse de transport de contrôle, déterminé à l'aide de l'attribution de correction (D, T, F).
  4. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le dispositif de correction (21) est conçu pour déterminer le facteur de correction propre au capteur (K(vP)) valable pour la vitesse de transport de contrôle (vP), en fonction d'une information fournie au capteur concernant la direction de transport du document de valeur à contrôler par rapport au capteur,
    et/ou
    en ce que le dispositif de correction (21) est conçu pour déterminer le facteur de correction propre au capteur (K(vP)) valable pour la vitesse de transport de contrôle (vP) en fonction d'une information fournie au capteur concernant une valeur de consigne de la constante de temps de luminescence du document de valeur à contrôler.
  5. Procédé selon l'une quelconque des revendications précédentes, caractérisé en ce que le paramètre propre au capteur mémorisé dans le capteur est une valeur de décalage propre au capteur (a, d) du capteur, qui est caractéristique d'un décalage propre au capteur le long de la direction de transport du document de valeur entre une zone d'éclairage et une zone de détection du capteur, étant en particulier une longueur de décalage propre au capteur (d) du capteur qui indique la distance le long de la direction de transport du document de valeur entre la zone d'éclairage et la zone de détection.
  6. Procédé selon l'une quelconque des revendications précédentes, dans lequel à l'étape a), lors de la détermination du paramètre propre au capteur, les étapes suivantes sont effectuées consistant à :
    a1) transporter devant le capteur un support de référence pourvu d'une substance luminescente de référence, à une vitesse de transport de référence (v0) le long d'une direction de transport, dans lequel la substance luminescente de référence présente une constante de temps de luminescence spécifiée(tR0) spécifiée, et
    a2) mesurer la variation dans le temps de la luminescence de la substance luminescente de référence au moyen du capteur à la vitesse de transport de référence (v0) pendant le transport du support de référence, et
    a3) déterminer une constante de temps de support de référence (tR(v0)) de la substance luminescente de référence pour la vitesse de transport de référence (v0) à l'aide de la variation dans le temps mesurée à la vitesse de transport de référence (v0) de la luminescence de la substance luminescente de référence, et
    a4) déterminer un facteur de correction propre au capteur (K(v0)) valable pour la vitesse de transport de référence (v0) à l'aide de la constante de temps de support de référence (tR(v0)) déterminée de la substance luminescente de référence et à l'aide de la constante de temps de luminescence spécifiée (tR0) de la substance luminescente de référence,
    et dans lequel à l'étape b), lors de la mémorisation du paramètre propre au capteur dans le capteur, les étapes suivantes sont effectuées consistant à :
    b1) mémoriser le facteur de correction propre au capteur (K(v0)) spécifique, valable pour la vitesse de transport de référence (v0), en tant que paramètre propre au capteur dans le capteur (25), ou
    b2) mémoriser en tant que paramètre propre au capteur un paramètre de décalage propre au capteur (a) qui a été déterminé à l'aide du facteur de correction propre au capteur (K(v0)) spécifique et de la valeur de la vitesse de transport de référence (v0),
    et dans lequel à l'étape c) lors de la fourniture de la correction de vitesse, le dispositif de correction (21) pour la correction de vitesse de la constante de temps de luminescence (t(vP)) du document de valeur respectif est conçu pour déterminer, en particulier calculer, le facteur de correction propre au capteur (K(vP)) qui est valable pour la vitesse de transport de contrôle (vP) du document de valeur à contrôler respectivement, au moyen d'une information fournie au capteur concernant la vitesse de transport de contrôle (vP) du document de valeur, et
    • sur la base du facteur de correction propre au capteur (K(v0)) spécifique, mémorisé dans le capteur, et le cas échéant de la valeur mémorisée dans le capteur de la vitesse de transport de référence (v0), ou
    • sur la base du paramètre de décalage propre au capteur (a), mémorisé dans le capteur, du capteur,
    si la vitesse de transport de contrôle (vP) ne correspond pas à la vitesse de transport de référence (v0) .
  7. Procédé selon la revendication 6, caractérisé en ce que le facteur de correction propre au capteur (K(v0)) spécifique, valable pour la vitesse de transport de référence (v0), et la valeur de la vitesse de transport de référence (v0) sont/seront mémorisés dans le capteur, et ce que pour la correction de vitesse, il est prévu d'établir à l'aide
    ∘ du facteur de correction propre au capteur (K(v0)) spécifique, et
    ∘ de la vitesse de transport de référence (v0), et
    ∘ du facteur de correction valable pour tous les capteurs (K0(v0)) valable pour la vitesse de transport de référence (v0),
    le paramètre de décalage propre au capteur (a) du capteur, et de déterminer, à l'aide du paramètre de décalage propre au capteur (a) établi du capteur, le facteur de correction propre au capteur (K(vP)) qui est valable pour la vitesse de transport de contrôle (vP) du document de valeur, dans lequel le paramètre de décalage propre au capteur (a) du capteur est calculé à l'aide du facteur de correction propre au capteur (K(v0)) spécifique et de la valeur de la vitesse de transport de référence (v0) et du facteur de correction (K0(v0)) idéal, valable pour la vitesse de transport de référence, en particulier à l'aide de la formule de calcul suivante : a = K v0 − K0 v0 / K0 v0 . arctan v0/3 .
    Figure imgb0009
  8. Procédé selon l'une quelconque des revendications 6 à 7, caractérisé en ce que dans le capteur est/sera mémorisée une table de correction (T) qui indique pour plusieurs paramètres de décalage (a1, a2, ...) possibles respectivement le facteur de correction dû au décalage (K1(v0), K1(v1), ..., K2 (v0), K2(v1), ...), valable pour le paramètre de décalage (a1, a2, ...), en fonction de la vitesse de transport (v0, v1, ...) du document de valeur, et en ce que lors de la correction de vitesse il est prévu pour l'établissement du facteur de correction propre au capteur (K(vP)) valable pour la vitesse de transport de contrôle (vP)de
    - déterminer à l'aide de la table de correction (T) le facteur de correction propre au capteur (K(vP)) qui est valable pour la vitesse de transport de contrôle (vP) du document de valeur et le capteur respectif, et
    - effectuer la correction de la constante de temps de luminescence (t(vP)) du document de valeur à l'aide du facteur de correction propre au capteur (K(vP)) déterminé à l'aide de la table de correction (T) .
  9. Procédé selon l'une quelconque des revendications 6 à 8, caractérisé en ce que dans le capteur
    - la dépendance de la vitesse du facteur de correction valable pour tous les capteurs (K0(v0), K0(v1), ...) est/sera mémorisée, et
    - le paramètre de décalage propre au capteur (a) est/sera mémorisé, ou selon la revendication 8 ou 9 est déterminé pour la correction de vitesse à partir du facteur de correction propre au capteur (K(v0)) spécifique, et
    - une formule de correction (F) est/sera mémorisée, qui est réalisée pour calculer le facteur de correction propre au capteur (K(vP)) sur la base du paramètre de décalage propre au capteur (a) ainsi que sur la base de la vitesse de transport de contrôle (vP) du document de valeur et sur la base du facteur de correction valable pour tous les capteurs (K0(vP)) valable pour la vitesse de transport de contrôle (vP) du document de valeur, et en ce que lors de la correction de vitesse il est prévu de
    - déterminer, à l'aide de la dépendance de la vitesse du facteur de correction valable pour tous les capteurs (K0(v0), K0(v1), ...), le facteur de correction valable pour tous les capteurs (K0(vP)), valable pour la vitesse de transport de contrôle (vP) du document de valeur, et
    - calculer, au moyen de la formule de correction (F), le facteur de correction propre au capteur (K(vP)) du capteur, valable pour la vitesse de transport de contrôle (vP), à l'aide
    o du facteur de correction valable pour tous les capteurs (K0(vP)), valable pour la vitesse de transport de contrôle (vP) du document de valeur, et
    o du paramètre de décalage propre au capteur (a) du capteur, et
    o de la valeur de la vitesse de transport de contrôle (vP) du document de valeur,
    par exemple au moyen de la formule de correction K vP = K0 vP ⋅ 1 + a ⋅ arctan ( vP/3 .
    Figure imgb0010
  10. Procédé selon l'une quelconque des revendications 1 à 9, caractérisé en ce que dans le capteur est mémorisée une dépendance de la vitesse du facteur de correction propre au capteur (K(v)) qui attribue à différentes vitesses de transport (v) possibles du document de valeur respectivement un facteur de correction propre au capteur valable pour la vitesse de transport respective, et en ce qu'à l'étape c), lors de la fourniture de la correction de vitesse, le dispositif de correction pour la correction de vitesse de la constante de temps de luminescence (t(vP)) du document de valeur respectif sera conçu pour déterminer à l'aide de la dépendance de la vitesse, mémorisée dans le capteur, du facteur de correction propre au capteur (K(v)) et au moyen d'une information fournie au capteur concernant la vitesse de transport de contrôle (vP) du document de valeur, le facteur de correction propre au capteur (K(vP)) qui est valable pour la vitesse de transport de contrôle (vP) du document de valeur.
  11. Procédé selon la revendication 6 et la revendication 10, caractérisé en ce que
    - la détermination du paramètre propre au capteur selon les étapes a1) à a4) est effectuée au niveau du capteur successivement pour plusieurs vitesses de transport de référence (v0, v1, ...) différentes du support de référence, dans lequel pour chacune des vitesses de transport de référence, respectivement un facteur de correction propre au capteur (K(v0), K(v1), ...) spécifique est déterminé pour la vitesse de transport de référence (v0, v1, ...) respective à l'aide d'une constante de temps de support de référence (tR(v0), tR(v1), ...) déterminée respectivement de la substance luminescente de référence et à l'aide de la constante de temps de luminescence (tR0) spécifiée de la substance luminescente de référence,
    - la dépendance de la vitesse K(v) du facteur de correction propre au capteur est déterminée à partir des facteurs de correction propres aux capteurs (K(v0), K(v1), ...) spécifiques des différentes vitesses de transport de référence (v0, v1, ...), et
    - la dépendance de la vitesse K(v) valable pour le capteur respectif du facteur de correction propre au capteur est mémorisée dans le capteur (25).
  12. Capteur (25) permettant de contrôler des documents de valeur (3) qui sont transportés pour être contrôlés devant le capteur pour leur contrôle le long d'une direction de transport (x) à une vitesse de transport de contrôle (vP),
    dans lequel le capteur
    - présente au moins une source de lumière d'excitation (23, 24) pour exciter une luminescence du document de valeur (3), et
    - présente au moins un photodétecteur (20) pour détecter la luminescence du document de valeur excité par la source de lumière d'excitation,
    - est conçu pour mesurer au moyen dudit au moins un photodétecteur la variation dans le temps de la luminescence du document de valeur pendant le transport du document de valeur devant le capteur, et
    - présente un dispositif d'évaluation (22) qui est réalisé pour déterminer une constante de temps de luminescence (t(vP)) du document de valeur à la vitesse de transport de contrôle (vP) à l'aide de la variation dans le temps mesurée de la luminescence du document de valeur, et
    - présente un dispositif de correction (21) dans lequel une correction de la vitesse, en particulier selon l'une quelconque des revendications 1 à 11, est fournie pour corriger la constante de temps de luminance (t(vP)) déterminée pour le document de valeur respectif, et
    dans lequel au moins un paramètre propre au capteur (K(v0), a, d) est mémorisé dans le capteur (25), et
    dans lequel le dispositif de correction (21) est conçu pour corriger la constante de temps de luminescence (t(vP)) du document de valeur transporté devant le capteur à une vitesse de transport de contrôle (vP), pour déterminer, sur la base dudit au moins un paramètre propre au capteur (K(v0), a, d) mémorisé dans le capteur et au moyen d'une information fournie au capteur concernant la vitesse de transport de contrôle (vP), un facteur de correction (K(vP)) propre au capteur qui est valable pour la vitesse de transport de contrôle (vP) du document de valeur, et
    dans lequel le capteur, en particulier le dispositif de contrôle ou le dispositif d'évaluation du capteur, est conçu pour corriger la constante de temps de luminescence (t(vP)) déterminée pour le document de valeur à l'aide dudit au moins un facteur de correction propre au capteur (K(vP)) valable pour la vitesse de transport de contrôle (vP) du document de valeur afin de déterminer une constante de temps de luminescence corrigée (t*(vP)) pour le document de valeur, et
    dans lequel le capteur (22), en particulier le dispositif d'évaluation du capteur, est conçu pour contrôler la luminescence du document de valeur respectif à l'aide de la constante de temps de luminescence corrigée (t*(vP)).
  13. Capteur selon la revendication 12, caractérisé en ce que le paramètre propre au capteur, mémorisé dans le capteur, est une valeur de décalage propre au capteur mémorisée (d, a) du capteur qui est caractéristique du décalage propre au capteur le long de la direction de transport du document de valeur entre une zone d'éclairage et une zone de détection du capteur, étant en particulier une longueur de décalage propre au capteur (d) du capteur qui indique la distance le long de la direction de transport du document de valeur entre la zone d'éclairage et la zone de détection, et/ou
    en ce que le paramètre propre au capteur, mémorisé dans le capteur, est un facteur de correction propre au capteur (K(v0)) spécifique qui est valable individuellement pour le capteur respectif et pour une vitesse de transport de référence (v0) du document de valeur.
  14. Capteur selon l'une quelconque des revendications 12 à 13, caractérisé en ce que dans le capteur est mémorisée au moins une attribution de correction (D, T, F), en particulier une attribution de valeur de décalage (D) ou une table de correction (T) ou une formule de correction (F) qui attribue pour différentes valeurs de décalage propres aux capteurs (a1, a2, ..., d1, d2, ...) possibles du capteur respectivement à différentes vitesses de transport (v0, v1, ...) possibles du document de valeur à contrôler respectivement un facteur de correction dû au décalage (K1(v0), K1(v1), ..., K2(v0), K2(v1), ...), et en ce que lors de la correction de vitesse il est prévu de
    - déterminer, à l'aide de l'attribution de correction (D, T, F), en particulier de l'attribution de valeur de décalage (D) ou de la table de correction (T) ou de la formule de correction (F), à l'aide du paramètre propre au capteur (K(v0), a, d) mémorisé dans le capteur, le facteur de correction propre au capteur (K(vP)) qui est valable pour le paramètre propre au capteur (K(v0), a, d) mémorisé dans le capteur et pour la vitesse de transport de contrôle (vP) du document de valeur, et
    - effectuer la correction de la constante de temps de luminescence (t(vP)) à l'aide du facteur de correction propre au capteur (K(vp)) valable pour la vitesse de transport de contrôle (vP), déterminé à l'aide de l'attribution de correction (D, T, F).
  15. Capteur (25) selon la revendication 12, caractérisé en ce que
    - dans le capteur est mémorisée au moins une dépendance de la vitesse (K(v)), en particulier obtenue au moyen du procédé selon la revendication 10, du facteur de correction propre au capteur, qui attribue à différentes vitesses de transport (v0, v1, ...) respectivement un facteur de correction propre au capteur (K(v0), K(v1), ...), et
    - pour corriger la constante de temps de luminescence (t(vP)) du document de valeur transporté devant le capteur à la vitesse de transport de contrôle, le dispositif de correction (21) est conçu pour déterminer, au moyen de l'information fournie au capteur concernant la vitesse de transport de contrôle (vP) à l'aide de la dépendance de la vitesse mémorisée dans le capteur du facteur de correction propre au capteur (K(v)), le facteur de correction propre au capteur (K(vP)) qui est valable pour la vitesse de transport de contrôle (vP) du document de valeur.
  16. Capteur selon l'une quelconque des revendications 12 à 15, caractérisé en ce que le dispositif de correction (21) est conçu pour déterminer le facteur de correction propre au capteur (K(vP)) valable pour la vitesse de transport de contrôle (cP)
    - en fonction d'une information fournie au capteur concernant la direction de transport de contrôle (x, -x) du document de valeur à contrôler par rapport au capteur,
    et/ou
    - en fonction d'une information fournie au capteur concernant une valeur de consigne de la constante de temps de luminescence du document de valeur à contrôler.
  17. Dispositif (1) permettant de traiter des documents de valeur , comprenant
    - un capteur (25) selon l'une quelconque des revendications 12 à 16, et
    - un dispositif de transport (10) pour transporter le document de valeur (3) respectivement à contrôler devant le capteur (25) le long d'une direction de transport (x) à une vitesse de transport de contrôle (vP).
  18. Procédé permettant de contrôler des documents de valeur par un capteur selon l'une quelconque des revendications 12 à 16, dans lequel les étapes suivantes sont exécutées consistant à :
    A) transporter un document de valeur à contrôler devant le capteur (25) le long d'une direction de transport (x) à une vitesse de transport de contrôle (vP) et mesurer la variation dans le temps de la luminescence du document de valeur au moyen du capteur pendant le transport,
    B) fournir une information concernant la vitesse de transport de contrôle (vP) du document de valeur dans le capteur (25),
    C) déterminer un facteur de correction propre au capteur (K(vP)) qui est valable pour la vitesse de transport de contrôle (vP) du document de valeur, à l'aide du paramètre propre au capteur (K(v0), a, d) mémorisé dans le capteur et au moyen de l'information fournie au capteur concernant la vitesse de transport de contrôle (vP),
    D) déterminer une constante de temps de luminescence (t(vP)) du document de valeur à la vitesse de transport de contrôle (vP) à l'aide de la variation dans le temps mesurée de la luminescence du document de valeur,
    E) corriger la constante de temps de luminescence (t(vP)) du document de valeur à l'aide du facteur de correction propre au capteur (K(vP)) valable pour la vitesse de transport de contrôle (vP) du document de valeur afin de déterminer une constante de temps de luminescence corrigée (t*(vP)) pour le document de valeur,
    F) contrôler le document de valeur à l'aide de la constante de temps de luminescence corrigée (t*(vP)).
EP22708744.2A 2021-02-16 2022-02-15 Capteur pour le contrôle de documents de valeur Active EP4295332B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102021000807.3A DE102021000807A1 (de) 2021-02-16 2021-02-16 Sensor zur Prüfung von Wertdokumenten
PCT/EP2022/025049 WO2022174978A1 (fr) 2021-02-16 2022-02-15 Capteur pour le contrôle de documents de valeur

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EP4295332A1 EP4295332A1 (fr) 2023-12-27
EP4295332B1 true EP4295332B1 (fr) 2024-10-30

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US (1) US12450967B2 (fr)
EP (1) EP4295332B1 (fr)
DE (1) DE102021000807A1 (fr)
WO (1) WO2022174978A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US6686074B2 (en) * 2001-03-16 2004-02-03 Bundesdruckerei Gmbh Secured documents identified with anti-stokes fluorescent compositions
DE10113267B4 (de) * 2001-03-16 2019-05-09 Bundesdruckerei Gmbh Verwendung eines Anti-Stokes-Leuchtstoffes in Sicherheitsdokumenten
EP1532576A4 (fr) * 2002-06-07 2006-09-27 Univ Boston Systeme et procedes d'authentification de produits et documents
US7981362B2 (en) * 2003-11-04 2011-07-19 Meso Scale Technologies, Llc Modular assay plates, reader systems and methods for test measurements
DE102009058669A1 (de) * 2009-12-16 2011-06-22 Giesecke & Devrient GmbH, 81677 Echtheitsmerkmal in Form von lumineszierenden Substanzen
DE102010014912A1 (de) * 2010-04-14 2011-10-20 Giesecke & Devrient Gmbh Sensor zur Prüfung von Wertdokumenten
DE102012025263A1 (de) 2012-12-21 2014-06-26 Giesecke & Devrient Gmbh Sensor und Verfahren zur Prüfung von Wertdokumenten
US20150198528A1 (en) * 2014-01-11 2015-07-16 Xen Biofluidx, Inc. Assay detection system
AU2018242894B2 (en) 2017-03-27 2020-11-05 Glory Ltd. Optical sensor, light detection apparatus, sheet processing apparatus, light detection method, and phosphorescence detection apparatus
DE102018007289A1 (de) * 2018-09-14 2020-03-19 Giesecke+Devrient Currency Technology Gmbh Wertdokumentsystem
JP7262952B2 (ja) * 2018-09-19 2023-04-24 株式会社東芝 紙葉類処理装置および紙葉類処理方法
EP3982341A1 (fr) 2019-05-30 2022-04-13 Kabushiki Kaisha Toshiba Procédé d'étalonnage d'image fluorescente
EP4112171A1 (fr) * 2021-06-29 2023-01-04 Max-Planck-Gesellschaft zur Förderung der Wissenschaften e.V. Procede et appareil de manipulation spatiale d'au moins une particule dans un fluide, produit de programme informatique et moyen de memoire lisible par ordinateur

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WO2022174978A1 (fr) 2022-08-25
DE102021000807A1 (de) 2022-08-18
US12450967B2 (en) 2025-10-21
EP4295332A1 (fr) 2023-12-27
US20240127657A1 (en) 2024-04-18

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