EP2377104A1 - Dispositif et procédé de détection de lumière réfléchie et/ou émise par un objet - Google Patents

Dispositif et procédé de détection de lumière réfléchie et/ou émise par un objet

Info

Publication number
EP2377104A1
EP2377104A1 EP09801661A EP09801661A EP2377104A1 EP 2377104 A1 EP2377104 A1 EP 2377104A1 EP 09801661 A EP09801661 A EP 09801661A EP 09801661 A EP09801661 A EP 09801661A EP 2377104 A1 EP2377104 A1 EP 2377104A1
Authority
EP
European Patent Office
Prior art keywords
light
sensor
illumination device
emitted
reflected
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP09801661A
Other languages
German (de)
English (en)
Other versions
EP2377104B1 (fr
Inventor
Christoph Reinhard
Reto Schletti
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
CI Tech Sensors AG
Original Assignee
BEB Industrie Elektronik AG
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Application filed by BEB Industrie Elektronik AG filed Critical BEB Industrie Elektronik AG
Publication of EP2377104A1 publication Critical patent/EP2377104A1/fr
Application granted granted Critical
Publication of EP2377104B1 publication Critical patent/EP2377104B1/fr
Active legal-status Critical Current
Anticipated expiration legal-status Critical

Links

Classifications

    • 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

Definitions

  • the invention is based on a device and a method for detecting reflected and / or emitted light of an object, in particular a flat object.
  • Such devices are used in the inspection of objects. These include, for example, detecting, controlling, verifying and verifying the authenticity of objects and identifying counterfeits.
  • the items include in particular notes of value or documents such as banknotes, checks, stocks, papers with security imprint, certificates, tickets or tickets, vouchers, but also credit or debit cards, identification or access cards.
  • Devices for detecting reflected and / or emitted light of an object are often part of a multi-component system for processing flat objects.
  • Devices for detecting reflected and / or emitted light serve to distinguish counterfeit from real objects.
  • the objects in particular banknotes, security, identity or value documents, are printed with suitable security printing inks. These give the viewer in the visible spectral range a specific
  • the intensity of the light reflected or emitted by the object is either so high that the detector used for detection saturates or is so weak that the detector can not detect the effect
  • the intensity of the reflected or emitted light can not be limited to a predetermined value or a narrow range and the detector or sensor can not be set to this range
  • the device with the features of claim 1 has the advantage that it is equipped with a power supply for a lighting device, which supplies the lighting device with a temporally periodic current, wherein a period of time course has at least two current pulses with different amount
  • the different strong current pulses of the power supply lead to different intensities of the light pulses of the illumination device
  • Each area of the object is thereby irradiated with a strong and a weak light pulse.
  • the frequency of the pulsed light and the temporal resolution of a sensor which detects the light reflected by the object and / or emitted by fluorescence and phosphorescence is thereby compared to the velocity of the light Transportation device so high that the movement of the object between two light pulses is vemachgligigbar It can therefore be assumed that the object rests between the lighting with a strong and a weak light pulse
  • the sensor detects the light reflected and / or emitted by the object both in relation to the strong and to the weak Light pulse If saturation of the sensor is achieved during the strong light pulse, then only the reflected and / or emitted light is evaluated with respect to the weak light pulse. On the other hand, due to the weak light pulse, the reflected and / or emitted light is too low with respect to its intensity Detect sensor, so only the reflected and / or emitted light is evaluated with respect to the strong light pulse In this way, the dynamic range of the optical measuring system is extended This allows a quantified detection without the strength of the optical properties to be detected in advance
  • the number of different current pulses per period of the time-periodic current can be increased.
  • the current strengths of the current pulses and the duration of the current pulses in relation to the duration of the current strength 0, which as duty cycle can be specified as a function of the objects to be examined. This also applies to the period duration or the frequency of the time-periodic current
  • Time periodic current in this case means that the current is a periodic function over time and thus has a penodicity over time
  • the inventive method with the features of claim 10 is characterized in that the illumination device irradiates the object with pulsed light, wherein within a period of the pulsed
  • At least two light pulses of different intensity are generated
  • the illumination input is supplied with a pulsed current by means of a power supply, each period having at least two current pulses with different current intensity
  • the illumination device has at least one light-emitting diode LED
  • excitation lamps such as fluorescent lamps and gas discharge lamps
  • light emitting diodes LED are characterized by a compact dimension, a lower manufacturing price, a faster
  • the illumination with monochromatic light or at least light of a narrow spectral range is advantageous in this way is a distinction of the fluorescence and phosphorescence of real objects on the one hand and counterfeit On the other hand, it was easier to do so
  • the light-emitting diode LED is a UV-emitting diode UV-LED UV light has the advantage that the fluorescence and phosphorescence in the visible spectral range or near the visible spectral range and therefore easily detected with optical sensors can be
  • the first and the second sensor are located at different positions
  • the illumination device is preferred , in particular the light-emitting diode LED with its optical axis arranged at an angle different from 0 ° and 90 ° to the transport direction of the transport means
  • the first sensor for detecting the light reflected from the object is with its optical axis at the same angle to the surface of the object arranged like that
  • Lighting device symmetrical to a plane perpendicular to the surface of the object and through the intersection between optical axis of the illumination device and the surface of the object runs. It is exploited that the reflection and the angle of incidence of the light are identical in the reflection.
  • the second sensor may be in any position, for example, vertically above the surface of the article. This means that its optical axis is aligned perpendicular to the surface of the object. Since the wavelength of the reflected light is different from that of the emitted light, different sensors are used. The wavelength of the reflected light coincides with the wavelength of the light of the lighting device. The wavelength of the emitted light is less than that of the light of the illumination device.
  • the second sensor is an RGB sensor.
  • RGB stands for the abbreviation red green blue.
  • This sensor is based on the three-color theory, in which the entire color space is made up of the superimposition of the colors red, green and blue. For each of the three primary colors, a separate sensor element is used.
  • Lighting device and the second sensor disposed an optical shield. This prevents that the light of the illumination device leads to an impairment of the second sensor.
  • a filter can be arranged on the illumination device, which filters out the typical wavelengths of the fluorescence and phosphorescence from the light of the light source
  • Lighting device filters out.
  • the power supply of the lighting device is equipped with at least two parallel input resistors and a Differe ⁇ zverlochr. Furthermore, the power supply has a voltage source which supplies at least two pulsed input voltages. The number of pulsed input voltages coincides with the number of current pulses per period of the power supply. With two input voltages, the frequency of one input voltage is twice as large as the frequency of the other input voltage. For a number n of input voltages, the largest frequency is n times the smallest frequency. The maximum of
  • Input voltages may be the same or different.
  • the phase shift between the input voltages is 0. This particularly simple circuit with inexpensive components reliably generates a periodic current with at least two different current pulses per period.
  • the sensors convert the light reflected or emitted by the article into an electrical signal proportional to the intensity of the light. It may be, for example, photodiodes or CCD. In this case, a plurality of such components can be arranged in a row or in an array. Furthermore, the sensor is equipped with an optical system, in particular a lens system. In addition, the sensor may include a filter to mask out those wavelengths of light that are to be detected with the other sensor. For example, the second sensor for detecting the light based on fluorescence and phosphorescence is equipped with a filter which absorbs the light in the wavelength range of the illumination device.
  • FIG. 1 shows a basic structure of the device
  • FIG. 2 device according to FIG. 1 with additional optical shielding and a filter
  • FIG. 3 shows a longitudinal section through a device with the basic structure according to FIG. 1, FIG.
  • FIG. 4 detail from FIG. 3,
  • FIG. 5 shows a circuit diagram of the device according to FIGS. 1 to 4,
  • FIG. 6 shows the time curve of the input voltages for the circuit diagram according to FIG. 5
  • FIG. 7 shows the time profile of the current intensity at the UV LED resulting from the two input voltages according to FIG.
  • Figures 1 and 2 show the basic structure of a device for detecting reflected and emitted light of an article 1.
  • the article is a banknote.
  • the object 1 is irradiated with light, which generates a lighting device 2.
  • the lighting device 2 is a UV LED.
  • Axis of the illumination device 2 is shown in Figure 1 by an arrow 3.
  • the light reflected from the surface of the article 1 is detected by a first sensor 4.
  • the optical axis of the first sensor 4 is indicated by the arrow 5. Further, the object 1 irradiated with the light of the illumination device 2 emits due to
  • Fluorescence and phosphorescence Light whose wavelength differs from the incident light of the illumination device.
  • a second sensor 6 is disposed above the article 1.
  • the optical axis 7 of this second sensor 6 runs perpendicular to the surface of the article 1.
  • the reflected light detected by the first sensor 4 is symbolized by an arrow 8 in FIG.
  • the light emitted by fluorescence or phosphorescence is symbolized by the arrow 9 in FIG.
  • FIG. 2 shows the same schematic structure as FIG. 1.
  • FIG. 2 shows an optical shield 10 between the illumination device 2 and the second sensor 6, and a filter 11 in front of the illumination device 2.
  • the filter is a UV transmission filter which filters out the visible components of the light of the illumination device, in particular blue components.
  • the second sensor 6 is an RGB sensor.
  • the optical shield 10 in the form of a partition wall ensures that the UV reflected directly from the object 1
  • FIG. 3 shows a complete device, which is constructed according to the principle of Figure 1 and 2.
  • the device consists of twovonseinrich- tions 2, two not visible in the drawing first sensors and two second sensors 6. Both lighting devices 2 are equipped with UV-LED and a filter 11. They are each in a housing 12, which also serves as an optical shield against the two second sensors 6.
  • Thedessei ⁇ cardien 2 and the second sensors 6 are arranged on a printed circuit board 13, which is equipped with further electrical components.
  • Printed circuit board and components arranged thereon are surrounded by a housing 14.
  • the housing 14 is equipped with a protective glass 15 permeable to this light.
  • FIG. 4 shows the detail of the device according to FIG.
  • FIG. 5 shows a circuit diagram of the power supply of the illumination device to the device according to FIGS. 1 to 4.
  • Inputs 18 and 19 of a differential amplifier 20 are provided at the inputs 16 and 17 of the circuit.
  • the two input resistors are connected in parallel.
  • the switchesspan ⁇ ache U 1 and U 2 are generated by a digital device, not shown, for example, a microcontroller, an FPGA or a CPLD.
  • the differential amplifier determines the base current of a transistor 21 which is connected to the UV LED of the illumination device 2.
  • the current through the diode is limited by a resistor 22.
  • FIG. 6 shows a diagram of the time profile of the two input voltages Ui and U 2 .
  • the frequency of the input voltage Ui is twice as large as that of the input voltage U ⁇ .
  • the phase shift is 0.
  • FIG. 7 shows the time profile of the current ILE D of the LED of the illumination device resulting from these input voltages in the case of the circuit according to FIG.
  • two current pulses 23 and 24 are generated.
  • the current pulse 23 has a higher current than the current pulse 24.
  • the duty cycle is 1/5.
  • the magnitude of the current pulses and the duty cycle depend on the input voltages U 1 and U 2 and the input resistances 18 and 19.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

L'invention concerne un dispositif et procédé de détection de lumière réfléchie et/ou émise par un objet (1), le dispositif comprenant au moins un système d'éclairage (2) qui éclaire l'objet (1) au moyen d'une lumière pulsée, et au moins un capteur (4, 6) qui détecte la lumière réfléchie et/ou émise par l'objet (1). Le dispositif de détection comprend également un système de transport qui transporte l'objet dans une direction de transport par rapport au système d'éclairage (2), en le faisant passer devant le capteur (4, 6), ainsi qu'une alimentation en courant électrique (16, 17, 18, 19, 20, 21, 22) du système d'éclairage (2) qui alimente ce dernier en courant électrique, constituant une fonction périodique par rapport au temps, une période présentant au moins deux impulsions de courant (23, 24) de valeur différente.
EP09801661.1A 2009-01-15 2009-12-04 Dispositif et procédé de détection de lumière réfléchie et/ou émise par un objet Active EP2377104B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE102009005171.6A DE102009005171B4 (de) 2009-01-15 2009-01-15 Vorrichtung und Verfahren zum Nachweis von reflektiertem und/oder emittiertem Licht eines Gegenstandes
PCT/EP2009/008688 WO2010081507A1 (fr) 2009-01-15 2009-12-04 Dispositif et procédé de détection de lumière réfléchie et/ou émise par un objet

Publications (2)

Publication Number Publication Date
EP2377104A1 true EP2377104A1 (fr) 2011-10-19
EP2377104B1 EP2377104B1 (fr) 2019-09-18

Family

ID=41682371

Family Applications (1)

Application Number Title Priority Date Filing Date
EP09801661.1A Active EP2377104B1 (fr) 2009-01-15 2009-12-04 Dispositif et procédé de détection de lumière réfléchie et/ou émise par un objet

Country Status (5)

Country Link
US (1) US8472025B2 (fr)
EP (1) EP2377104B1 (fr)
CN (1) CN102282592B (fr)
DE (1) DE102009005171B4 (fr)
WO (1) WO2010081507A1 (fr)

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DE102012006347A1 (de) * 2012-03-28 2013-10-02 Brose Fahrzeugteile Gmbh & Co. Kg, Hallstadt Verfahren und Sensorsystem zur Erfassung eines Objektes und/oder zur Bestimmung eines Abstands zwischen dem Objekt und einem Fahrzeug
CN103218870A (zh) * 2013-03-04 2013-07-24 上海古鳌电子科技股份有限公司 一种能够利用红外测厚及紫外鉴伪的清分机及其使用方式
DE102015008409A1 (de) * 2015-07-02 2017-01-05 Eisenmann Se Anlage zur optischen Überprüfung von Oberflächenbereichen von Gegenständen
US10180248B2 (en) 2015-09-02 2019-01-15 ProPhotonix Limited LED lamp with sensing capabilities
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Also Published As

Publication number Publication date
EP2377104B1 (fr) 2019-09-18
DE102009005171A1 (de) 2010-07-22
CN102282592B (zh) 2014-11-05
US20110273717A1 (en) 2011-11-10
WO2010081507A1 (fr) 2010-07-22
US8472025B2 (en) 2013-06-25
CN102282592A (zh) 2011-12-14
DE102009005171B4 (de) 2025-05-08

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