EP2668643B1 - Système de sécurité pour ensemble de vitrage et procédé de détection d'une sollicitation mécanique ou thermique d'un élément de vitrage plan - Google Patents

Système de sécurité pour ensemble de vitrage et procédé de détection d'une sollicitation mécanique ou thermique d'un élément de vitrage plan Download PDF

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Publication number
EP2668643B1
EP2668643B1 EP12703003.9A EP12703003A EP2668643B1 EP 2668643 B1 EP2668643 B1 EP 2668643B1 EP 12703003 A EP12703003 A EP 12703003A EP 2668643 B1 EP2668643 B1 EP 2668643B1
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EP
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Prior art keywords
waveguide structure
optical waveguide
optical
glazing element
signal
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EP12703003.9A
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German (de)
English (en)
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EP2668643A1 (fr
Inventor
Udo WEINAND
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Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
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Fraunhofer Gesellschaft zur Foerderung der Angewandten Forschung eV
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    • G—PHYSICS
    • G08—SIGNALLING
    • G08B—SIGNALLING SYSTEMS, e.g. PERSONAL CALLING SYSTEMS; ORDER TELEGRAPHS; ALARM SYSTEMS
    • G08B13/00—Burglar, theft or intruder alarms
    • G08B13/02—Mechanical actuation
    • G08B13/04—Mechanical actuation by breaking of glass

Definitions

  • the present invention relates to a glazing assembly with safety function, to a security system for a glazing assembly and to a method for detecting a mechanical or thermal stress of a planar glazing member.
  • the present invention relates to a concept for monitoring a sheet glazing element, e.g. a glass pane or a laminated glass pane, in order to detect a mechanical or thermal stress by an external action on the planar glazing element early or promptly.
  • a sheet glazing element e.g. a glass pane or a laminated glass pane
  • the inventive concept can be applied to planar glazing elements which, when used, are subjected to strong mechanical and / or thermal stresses, such as e.g. on windshields in an airplane cockpit, on trains or other vehicles, to detect early excessive mechanical or thermal stress on the glazing elements and to avoid mechanical failure due to sudden, unforeseen breakage of the planar glazing element.
  • so-called safety glass is used to provide either the glazing, eg laminated glass or laminated safety glass, with as much intrusion-resistant effect as possible or unauthorized physical access to areas secured by safety glass, eg displays of jewelers, showcases etc., as safe as possible.
  • so-called passive glass breakage detectors are used for the respective glazing elements, which are arranged on the glazing to be monitored, and detect a broken glass or a physical destruction of the glazing element.
  • different DIN standards refer to so-called resistance classes (DIN V ENV 1627), which, for example, consider resistance times, ie the time that a product withstands burglary, the types of perpetrators and the modus operandi.
  • test standards DIN EN 356) for antiperspirant glazings, ie to what extent the glazings are burglary-resistant, puncture-resistant or attack-inhibiting.
  • safety glass is also used in areas such as e.g. as windshields in aircraft cockpits, high-speed trains or other vehicles which are exposed to very strong thermal and in particular mechanical stresses.
  • a disadvantage of the methods known hitherto in the prior art is that, for example, a break-in attempt is detected only when mechanical damage or destruction of the monitored glazing element occurs. If, for example, in the event of a break-in attempt, the safety glass is changed in stability by means of a gas burner or cutting torch until the safety glass finally melts, a possible burglar can reach the valuables issued behind the safety glazing relatively quickly, without issuing an alarm from a passive glass breakage detector becomes. Furthermore, so far had to be used to identify a heat source in the security area consuming thermal imaging cameras, a timely heat information should be obtained. In order to obtain the most comprehensive detection of burglary, different monitoring concepts therefore had to be combined according to the prior art in order to detect both mechanical and thermal effects on safety glazings. This leads to their realization to a high cost and thus also high costs.
  • the publication GB 2 193 825 A discloses a buried optical fiber building material to be bonded to a fiber optic system, which building material inherently meets the requirements for use as a physical barrier. Light transmission characteristics can be provided for this building material, and it can be used in conjunction with a safety detection system.
  • the building material comprises substantially rigid material, for example a layered arrangement of glass, wherein in the substantially rigid material at least one continuous optical fiber is embedded, said optical fiber optically stiffening at its ends substantially outside or rigid material is optically connectable.
  • the object of the present invention is to provide a concept for a glazing arrangement with a safety function, by means of which a detection of a mechanical and / or thermal stress or load acting on a planar glazing element can be detected early and, if possible, in real time.
  • the core idea of the present invention is to mechanically arrange an optical waveguide structure with an optical filter element, such as a fiber Bragg grating or Bragg filter, on the planar glazing element such that an optical property of the glazing element is due to mechanical or thermal stress Optical waveguide structure and in particular of the optical filter element is changed.
  • An optical connection between a glazing element and a Optical waveguide structure may be formed, for example, positive, cohesive or cohesive.
  • the planar glazing element in order to increase the detection reliability, "normal" thermal or mechanical effects, such as temperature changes due to solar radiation, on the planar glazing element in the evaluation of the optical property of the optical waveguide structure can be taken into account.
  • an optical waveguide structure with an optical filter element or a plurality of optical filter elements, which are formed, for example, as Bragg filters can be mechanically attached to a planar glazing element to be monitored.
  • optical filter elements or a plurality of optical filter elements which are formed, for example, as Bragg filters
  • these can have different filter center frequencies or filter center wavelengths in order to further obtain a spatial resolution of the mechanical or thermal stresses acting on the planar glazing element to be monitored, as will be explained in detail below.
  • the optical waveguide structure with the optical filter element or the optical filter elements can now, for example, on a multilayer, planar glazing element, for. B. a laminated glass arrangement are arranged, wherein the optical waveguide structure in a glass capillary, a milled groove or subsequently mounted on the safety glass in capillaries and is at least partially positively, positively and / or materially connected to the monitored, planar glazing element.
  • the optical waveguide structure is either already at the production of the glazing element in or on the same mechanically, ie, form, force and / or material fit, can be arranged or can be subsequently arranged on the glazing element in subsequently mounted recesses or recesses (eg capillary or groove).
  • the optical waveguide structure with the optical filter elements is already integrated in the material of the glazing element during the production of the glazing element or fixed within one of several layers of a laminated glass arrangement, for example using a transparent adhesive
  • the optical waveguide structure can readily form, force and / or materially bond be arranged on the glazing element, so that a mechanical stress or deformation (eg elongation) of the glass material is transmitted directly to the optical waveguide structure and the optical filter elements located therein.
  • a thermal stress on the glazing element ie a temperature increase, is transmitted directly to the optical waveguide structure and the optical filter elements located therein.
  • the optical waveguide structure can be inserted into an outwardly accessible recess (eg a milled groove) and connected substantially completely to the glazing element using an adhesive or if the optical waveguide structure is pushed in in a glass capillary provided in the glazing element substantially only at the end points (ie at the entry and exit point of the optical waveguide structure on the glazing element) can be mechanically connected to the same.
  • a mechanical stress e.g. in the form of an elongation of the glazing element, as a relatively uniform elongation of the optical waveguide structure between the two fixed end points.
  • the optical waveguide structure arranged on the planar glazing element to be monitored can be used simultaneously with the optically series-connected Bragg filters as a rupture sensor, since only signals from those filter elements (having a sufficient amplitude) that are reflected in the optical waveguide structure are reflected back Positions (in Lichteinkoppelraum) are located in front of the break, while reflection signals from one or more Bragg filters fail behind the break.
  • the procedure according to the invention for implementing the glazing arrangement with a safety function can now be used extremely advantageously for monitoring a planar glazing element, since the optical waveguide structure with the optical filter elements designed as Bragg filters can be used to feed an optical signal into the optical waveguide structure, and by the evaluation of The optical filter elements reflected or transmitted optical signal can be determined directly and almost in real time information about a mechanical and / or thermal stress of the monitored, planar glazing element.
  • the glazing arrangement according to the invention with security function is therefore everywhere applicable where valuables, goods or other objects are to be secured against unauthorized access or access, eg jewelers, banks, department stores, etc.
  • mechanical stresses in heavily used discs, such as Windscreens in aircraft cockpits, trains or other vehicles, can be detected in time.
  • Fig. 1a-b the basic structure and the basic operation of a glazing assembly 10 according to the invention with safety function according to a first embodiment of the present invention with reference to the in Fig. 2a-c illustrated basic configuration of an optical waveguide structure 30 with an optical filter element 32 described by way of example.
  • the glazing assembly 10 has a planar glazing element 20.
  • the planar glazing element can, for example, be a single-layered or multi-layered transparent material, eg glass, plastic or a composite material, exhibit.
  • the flat glazing element 20 for safety glazing as a laminated glass may have a combination of glass and transparent plastic films.
  • An optical waveguide structure 30 having an optical filter element, for example in the form of a fiber Bragg grating or an optical Bragg filter, is now arranged on the planar glazing element 20.
  • the optical waveguide structure 30 thus has an optical waveguide section 34 and the optical filter element 32.
  • the optical waveguide structure 30 has a coupling input 36 for coupling an optical signal S 1 into the optical waveguide structure 30.
  • the optical waveguide structure 30 also has an additional optical waveguide section 34, even after the optical filter element 32, wherein the further optical waveguide section 34, for example, to a Auskoppelausgang 38 on any side surface, such as an opposite side surface of the planar glazing element 20 for coupling out a through the optical filter element 32nd passing optical signal S Tr is performed.
  • the optical waveguide structure 30 is arranged within the material of the planar glazing element 20.
  • the planar glazing element 20 has, for example as a laminated glass, a plurality of individual layers 20-1,..., 20-5 (20-n), wherein the optical waveguide structure 30 is formed, for example, in a small capillary or a milled groove in the second glazing layer 20 -2 (behind the first disc 20-1) of the planar glazing element 20 is arranged.
  • the optical waveguide structure 30 can generally be introduced into a recess or recess 40 within the material of the planar glazing element 20 or else on a surface of the planar glazing element 20.
  • corresponding recesses or recesses may be provided on or in the glazing element 20 for insertion or insertion of the optical waveguide structure in advance.
  • the optical waveguide structure 30 can now be fastened, for example, in the provided recess 40 by means of a transparent adhesive material or another fastening material.
  • the optical waveguide structure 30 is also possible to subsequently arrange the optical waveguide structure 30 on a glazing element 20.
  • the optical waveguide structure 30 for example by means of a film (not shown in FIG Fig. 1a-b ), which are fixed to the surface of the planar glazing element 20 is glued to the surface of the planar glazing element 20 at least in the region of the recesses 40 for the optical waveguide structure 30.
  • optical waveguide structure 30 In connection with in Fig. 1a-b illustrated optical waveguide structure 30 is noted that this has only an optical filter element 32 to simplify the description.
  • a plurality of optical filter elements can be arranged in the optical waveguide structure 30, wherein the optical waveguide structure 30 can also be arranged along substantially arbitrarily shaped, eg meandering, recesses 40 in the planar glazing element 20.
  • further optical waveguide structures may be arranged separately from one another with respective coupling inputs and optional coupling inputs in the planar glazing element 20.
  • the optical waveguide structure (s) 30, each having a plurality of optical filter elements 32 can now be arranged on the planar glazing element 20, for example distributed over a grid of sensor elements (in the form of the optical filter elements 32) distributed over the base surface of the planar glazing element 20 to get.
  • Such an arrangement of the optical waveguide structure 30 on the planar glazing element 20 will be described in more detail below with reference to FIG Fig. 3 received.
  • the rectangular and straight shape of the surface of the planar glazing element 20, as shown in the figures, is to be regarded merely as an example.
  • the inventive concept is particularly applicable to arbitrarily shaped and curved surfaces of a planar glazing element 20.
  • the optical waveguide structure 30 with the optical filter element 32 for example, a diameter "a" of 80-200 .mu.m, so that, for example, provided in the sheet-like glazing element 20 recess 40 dimensions with a width "b" and a height "c" of, for example, 200-650 ⁇ m may have to accommodate the optical waveguide structure 30.
  • a transparent adhesive or other transparent bonding material (not shown in FIG Fig. 1a-b ) for filling any cavities, for maintaining the mechanical stability and for fixing to the glass (adhesion) may be provided, as far as the adhesive can be introduced into the recesses.
  • the optical waveguide structure 30 with the optical filter element 32 is now arranged on the planar glazing element 20 such that any mechanical and / or thermal stresses acting on the planar glazing element 20 are transmitted as directly as possible to the optical waveguide structure 30 with the optical filter element 32 or at least in be passed on to a certain extent. That is, the optical waveguide structure 30 is mechanically disposed on the planar glazing element 20 so that mechanical or thermal stress, i. the action of an elevated temperature or an external mechanical force on the planar glazing element 20 causes a change in the optical property of the optical waveguide structure 30 and in particular of the optical filter element 32 of the optical waveguide structure 30.
  • the optical waveguide structure 30 it is therefore necessary for the optical waveguide structure 30 to be sufficiently thermally and / or mechanically coupled to the planar glazing element 20 in order to ensure sufficient heat and / or force transmission from the planar glazing element 20 to the optical waveguide structure 30.
  • mechanical forces are meant, for example, tensile, compressive, impact, shock or bending loads.
  • the planar glazing element 20 and the optical waveguide structure 30 are arranged sufficiently close to each other or in (thermal) contact with each other.
  • a corresponding mechanical connection e.g. a force, shape and / or material connection
  • the optical waveguide structure 30 may be provided with the optical filter element 32 on the planar glazing element 20.
  • Fig. 2a-c discussed how the relationship between mechanical and / or thermal stress of the planar glazing element 20 and a change in an optical property of the optical waveguide structure 30 and in particular the optical filter element 32 of the optical waveguide structure 30, which is present for example in the form of a Bragg filter is obtained.
  • the optical filter element 32 is formed as a fiber Bragg grating or optical Bragg filter.
  • the Bragg filter 32 is an optical interference filter inscribed in the glass fiber core of the optical waveguide structure 30. Wavelengths of the optical signal S 1 (with the power distribution P 1 ) coupled into the optical waveguide structure 30 which lie within the filter bandwidth around the center bandwidth ⁇ B of the Bragg filter are (at least largely) reflected back and give the reflected signal S R1 with the power distribution P R1 .
  • the optical waveguide structure 30 in the form of a single-mode glass fiber thus has a highly transparent glass fiber core 30-1 with the refractive index n 2 , which is encased with a glass material 30-2 of lower refractive index n 1 .
  • the optical waveguide thus consists of a core 30-1 with the refractive index n 2 , a cladding (cladding) 30-2 with the refractive index n 1 and, for example, a protective coating (coating / buffer) 30-3 with a refractive index n 0 .
  • the light-guiding core 30-1 serves to guide and transmit the optical signal S 1 .
  • the cladding 30-2 has a lower optical refractive index than the core 30-1, ie n 1 ⁇ n 2 .
  • the cladding 30-2 thereby causes a total reflection at the boundary layer to the core 30-1 and thus a guiding of the radiation (ie the optical signal) in the core 30-1 of the optical waveguide 30.
  • the optical filter element 32 along the core 30-1 of Optical waveguide structure 34 is arranged in the fiber core 30-1 in the form of a periodic modulation of the refractive index, with high (n 3 ) and low refractive index regions (n 2 ), which reflect back the light in the fiber core 30-1 of a particular wavelength ⁇ B , and thus have the function of a band-stop filter, with n 3 >> n 2 .
  • neff is the effective refractive index of the fiber core 30-1 of the optical waveguide structure 30 and A is the grating period.
  • the spectral width of the band (blocking band) depends on the length of the fiber Bragg grating 32 and the strength of the refractive index change between the adjacent refractive index regions.
  • Fig. 2b now shows an example of the reflection behavior of the optical waveguide structure 30 with the Bragg filter 32.
  • the Bragg filter 32 acts as a bandpass filter, so that a portion of the injected spectrum is reflected back as a reflected component P R1 , ie the Bragg filter 32 acts as a band-stop filter about the center wavelength ⁇ B.
  • the transmission spectrum of the transmitted or continuous power P Tr in which the proportion was removed by the center frequency ⁇ B by the Bragg filter 32 from the transmission spectrum.
  • the center wavelength ⁇ B of the Bragg filter 32 depends on the effective refractive index as well as on the grating period A of the optical filter element 32 formed as a fiber Bragg grating.
  • the grating period A changes due to an applied mechanical load, ie an expansion or compression due to a tensile, compressive, impact, impact or bending load.
  • the optical waveguide structure 30 with the optical filter element 32 is mechanically coupled to the planar glazing element 20, so that strain or compression deformations due to mechanical or even thermal stress of the planar glazing element 20 at least partially transferred to the Bragg filter 32 of the optical waveguide structure 30,
  • the grating period A of the Bragg filter 32 and thus also the center wavelength ⁇ B of the Bragg filter 32 changes.
  • the refractive indices n 2 , n 3 in the fiber core 30-1 are also temperature-dependent, so that in addition the center wavelength ⁇ B changed according to the thermal load, which acts on the planar glazing element 20 and thus also on the optical filter element 32 of the optical waveguide structure 30.
  • a mechanical or thermal stress of the flat filter element 20 for example during a burglary attempt or during heavy use during use, for example, as a windscreen of a Vehicle, a change in the optical property of the optical waveguide structure 30 and in particular of the integrated therein Bragg optical filter 32 is caused.
  • Fig. 2c now shows by way of example resulting power spectra of an optical waveguide structure 30, the two optical filter elements (not shown in FIG Fig. 1a or 2a ) having.
  • the two Bragg filters are each designed so that they have different center wavelengths ⁇ B1 , ⁇ B2 , so that, knowing the position of the first and second optical filter element with a change in the center wavelength ⁇ B1 , ⁇ B2 in addition to the size of the mechanical or thermal stress can also be closed to a position at which the mechanical or thermal stress of the planar glazing element 20 takes place.
  • Bragg filters can now be embodied as extremely narrow bandstop filters with a fixed center wavelength ⁇ Bn , a larger number of Bragg filters 32-n in the optical waveguide structure 30 can also be realized, so that spatially resolved monitoring of the planar glazing element 20 can take place mechanical and / or thermal external stresses can be realized.
  • Fig. 3 shows a possible embodiment of the glazing assembly 10 according to the invention in the planar glazing element 20, an optical waveguide structure 30 having a plurality of optical filter elements 32-n is arranged.
  • the optical waveguide structure 30 is now formed again in order to couple the optical signal S 1 into the optical waveguide structure 30 at a coupling-in port 30, wherein, for example, at the first Bragg filter element 32-1 a first portion of the optical signal at the first center wavelength ⁇ B1 as the first reflection signal S R1 , at the second Bragg filter 32-2 at a second center wavelength ⁇ B2, a second reflection signal S R2 , etc., to the last Bragg filter element 32-n at a center wavelength ⁇ Bn, the reflection signal S Rn is reflected back to the coupling port 36.
  • the optical waveguide structure 30 with the optical filter elements 32-n is meandering on the planar glazing element 20 and, for example, within a specially provided recess (not shown in FIG Fig. 3 ) mechanically, for example, positive, non-positive or cohesive, attached to the flat glazing element 20.
  • a specially provided recess not shown in FIG Fig. 3
  • Bragg filter 32-n distributed in a grid on the flat glazing element 20 are arranged.
  • the distances A, B or C between adjacent Bragg filters 32-n can be chosen such that, depending on the thermal conductivity or the thermal diffusivity of the planar glazing element 20, ie the material surrounding the individual Bragg filters 32-n Heating the disk by eg 500 ° C (or more) at the nearest Bragg filter within a period of eg ⁇ 5 seconds, a clearly above the normal temperature fluctuations detected temperature increase, eg greater than 10 ° C, caused. Its center wavelength would typically increase by at least about 100 pm.
  • the optical waveguide structure 30 with the optical filter elements 32-n can be arranged on the planar glazing element 20 in such a way that at least one Bragg filter 32 is arranged per unit area (eg 0.01-1.0 m 2 ) in order to reliably detect a thermal or To detect mechanical stress on a change in the optical properties of the optical waveguide structure (s).
  • the plurality of optical filter elements 32-n are arranged along an optical waveguide structure 30.
  • optical waveguide structure 30 may be on the flat glazing element 20 also within a recess or recess in the planar glazing element 20, for example by means of a compound-producing adhesive (not shown in FIG Fig. 3 ) are mechanically arranged on the planar glazing element 20 in order to produce a sufficient mechanical and thermal coupling between the glazing element 20 and the optical waveguide structure 30, as already described with reference to FIG Fig. 1a-b
  • a compound-producing adhesive not shown in FIG Fig. 3
  • the comments made there are equally applicable to those in Fig. 3 shown arrangement is applicable.
  • Fig. 3 illustrated glazing assembly 10 with safety function is now on the one hand suitable to detect mechanical deformations due to a thermal or mechanical action on the planar glazing element 20.
  • a rupture of the planar glazing element 20 and thus also of the optical waveguide structure 30 are detected due to a corresponding break or bend.
  • a break point 60 is shown inside or on the planar glazing element 20.
  • the reflected signal S Rn obtained at the terminal 36 now contains no or greatly reduced reflection signals of the in Fig. 3 represented Bragg filters 32-9, 32-10 ... 32-n, which are arranged in Lichteinkoppel Rhein after the break point 60.
  • a mechanical breaking of the glazing element 20 and thus a breaking or bending of the optical waveguide structure 30 can be detected and assigned to a position between the two Bragg filter elements 32-8 and 32-9.
  • the reflection signal S R depending on the respective spacing of the Bragg filter elements 32-n, a local dissolution of a thermal or mechanical stress of the planar glazing element 20 via a change of individual center wavelengths ⁇ Bn , or a localization of a rupture of the planar glazing element, possible by a failure of the reflection signals or a large decrease (> 50%) of the amplitude of the reflection signal S Rn of the Bragg filter elements is detected after a break.
  • the optical waveguide structure 30 is mechanically connected to the glazing element 20 over the entire length, a local dissolution of a mechanical stress acting on the glazing element 20 can take place over the entire length of the optical waveguide structure 30, on which Bragg filter elements are arranged.
  • the local resolution corresponds to the spacing of the filter elements.
  • the optical waveguide structure 30 is subsequently introduced into a capillary 40 provided on the glazing element 20, it is often only possible to fix mechanically at the respective end pieces of the optical waveguide structure 30 which project from the glazing element 20 between the optical waveguide structure 30 and the glazing element 20 to make.
  • a local resolution at a thermal stress of the glazing element 20 i. W. is independent of the mechanical connection between the optical waveguide structure 30 and the glazing element 20, as long as a sufficiently good thermal coupling of the optical waveguide structure 30 with the glazing element 20 over the entire length of the optical waveguide structure 30 is present, which is already given by resting.
  • Fig. 4 an exemplary embodiment of a security system 70 for glazing described by way of example.
  • the security system 70 includes a glazing assembly 10 as shown in the previous FIGS Fig. 1a-b . 2a-c and 3 have been described and can be used in the embodiment shown below.
  • a signal input device 80 for coupling an optical signal S 1 into the optical waveguide structure 30 is shown on the coupling connection 36 intended.
  • the signal input device 80 is thus designed as an optical transmitter, while the signal detection device 82 is formed as an optical receiver.
  • the signal detection device 82 is designed such that it can detect, for example, the reflection signal S R provided at the coupling connection 36 and optionally the optional transmission signal S T provided at the optional coupling connection 38 or the respective power spectrum.
  • the detected optical signals are converted, for example, into electrical signals S e for further processing and / or evaluation by a processing device 90.
  • the processing device 90 is provided on the one hand, for example, to drive the signal input device 80 for coupling in the optical signal S l and also to evaluate the detection signal S e provided by the signal detection device 82 based on the reflection signal S R or the transmission signal S Tr .
  • the processing device 90 is in particular designed to determine a change in the property of the optical waveguide structure 30 in the case of mechanical or thermal stress on the glazing element 20.
  • the processing means and optionally also the signal injection and detection means 80, 82 may be adjacent to the glazing assembly 10 or via an optical fiber connection (not shown in Figs Fig. 4 ) may be disposed away from the glazing assembly 10, for example, to prevent unauthorized access and manipulation attempt, eg in the event of a break-in, to the security system 70.
  • the processing device 90 can apply a mechanical or thermal stress to the planar glazing element 20 and thus to the mechanically coupled optical waveguide structure 30 determine with the Bragg filter element 32 and the plurality of Bragg filter elements 32-n.
  • the processing device 90 can detect a change in the center wavelength ⁇ Bn of at least one of the Bragg filter elements 32-n and output a corresponding indication signal or alarm signal S OUT at an output port 92 if a comparison value for a wavelength change is exceeded.
  • the processing device 90 can output at the output terminal 92 a corresponding alarm output signal S OUT if the reflection signals S R do not include the reflection spectra of all the Bragg filter elements 32-n, since this is due to a break of the planar glazing element 20 and thus indicates a break or kink of the optical waveguide structure 30.
  • the processing device 90 is designed to compare the detection signal S e or a signal derived therefrom with a comparison value in order to determine whether the detection signal is within or outside a desired range, and to exceed the limit value for to indicate a mechanical or thermal load of the planar glazing element 20.
  • the comparison value may be determined, for example, based on an average or a plurality of preceding measurement values of the detection signal or signals derived therefrom. It can thus be achieved that, for example, a relatively slow thermal temperature change on the planar glazing element, as occurs, for example, due to solar radiation, does not lead to the triggering of an alarm, while, for example, a heat effect of high power, as is caused, for example, by a gas burner of a burglar, extremely fast or immediately leads to an alarm signal.
  • Today's gas burners have a heat radiation of more than 1900 ° C and a power of over 50 kW.
  • a second fixed comparison value can be provided, beyond which an alarm is triggered in any case, since this is in any case attributable to an indicates high thermal or mechanical stress of the planar glazing element 20, even if it has risen only slowly.
  • the detection signal or the signal derived therefrom is based on a center frequency of the respective Bragg filter or a level of the detected signal.
  • the processing device 90 is thus designed to detect the spectral distribution of the signal components in the reflection signal S R and also the respective level and to investigate a change in the respective signal components due to a mechanical or thermal stress.
  • Safety system 70 for glazing the signal input device 80, the signal detection device 82 and the processing device 90 are shown in the schematic diagram as separate elements or components, but these elements or components can also be combined into a single module 100.
  • the assembly 100 is also referred to as an optical sensor interrogator or fiber Bragg grating optical interrogator.
  • available fiber bragg grating interrogators can, for example, monitor up to 100 Bragg filter elements in series, so that with a single interrogator, relatively high spatial resolution can be achieved by monitoring a large number of Bragg filter elements in the array Optical waveguide structure 30 can be achieved.
  • the number of measuring points can be determined by the use of an optical switch (not shown in FIG Fig. 4 ).
  • the safety glazing arrangement according to the invention or security system according to the invention to perform an analysis of a mechanical action on the glazing assembly, for example, a distinction between the impact of one or more (intentional) shocks, the damage the glazing arrangement to entail, and incidental events that affect the glazing arrangement, such as a supersonic blast of an airplane, an incidental incident football, etc., to hit.
  • incidental events such as a supersonic blast of an airplane, an incidental incident football, etc.
  • the processing device 90 of the security system 70 can furthermore be used to evaluate the sensor results in the form of pattern recognition. It can be a pattern the change (s) of the optical properties of the optical waveguide structure in the form of the respective center wavelengths ⁇ B of the Bragg filters concerned are determined by the amplitudes of the changes of the central wavelengths ⁇ B of the respective mechanical action (s) and also of the temporal occurrence of the changes of the center wavelengths ⁇ B are analyzed.
  • a mechanical deformation in the glass material of the glazing arrangement will propagate from the point of action (eg wavelike), so that a pattern recognition or impact pattern recognition with respect to the acting mechanical load can be made.
  • a pattern of changes ⁇ B of the optical properties of the optical waveguide structure that decreases with time and distance, ie its amplitude and temporal appearance, is determined by the respective center wavelengths ⁇ B of the relevant Bragg beams. Filter result.
  • a strong mechanical load occurs in the form of a so-called supersonic bang of an aircraft (ie the mechanical load is based on a strong acoustic source in the near or far environment)
  • this mechanical load will be distributed relatively uniformly over the surface of the glazing arrangement a uniform distributed pattern of the change (s) ⁇ B of the optical properties of the optical waveguide structure, ie its amplitude and temporal appearance, will result from the respective center wavelengths ⁇ B of the relevant Bragg filters, ie essentially all Bragg filters.
  • the optical waveguide structure with the Bragg filters is used, for example, up to microseconds, e.g. with a clock of at least 1ms, 0.1ms or 10 ⁇ s (eg 1ms to 50 ⁇ s) and a readout frequency of at least 1kHz, 10kHz or 100kHz (eg 1 to 20kHz) to provide sufficient resolution of the resulting pattern in a to obtain mechanical action on the glazing structure.
  • the signal detection device 82 can thus be designed to provide a detection signal S e , based on the changes ⁇ B of the optical properties of the same Bragg filters of the optical waveguide structure, when subjected to a mechanical stress of the planar glazing element 20 has an information about the mechanical stress at the respective location of the affected Bragg filter, and further comprises a thermal stress on the planar glazing element 20 information about the thermal stress at the respective location of the affected Bragg filter.
  • the detected change .DELTA. ⁇ B of the optical properties of each of the Bragg filters can thus be used to distinguish both a mechanical and a thermal stress.
  • the processing device 90 can now be embodied to evaluate the detection signal S e in order to determine a local distribution of the mechanical stress over the planar glazing element when the planar glazing element 20 is subject to mechanical stress, and also when the planar glazing element 20 is subject to thermal stress to determine a local distribution of the thermal stress on the planar glazing element 20.
  • the local distribution of the mechanical and thermal stress is based on the local distribution of the plurality of Bragg filters on the planar glazing element 20.
  • a sufficiently high readout frequency of, for example, more than 1 kHz it is possible to distinguish between the mechanical load described above, which acts relatively locally on the glazing arrangement, for example in the form of a violent impact or impact load, and a strong mechanical load which is relatively high uniformly distributed over a larger area of the surface or the entire area of the surface of the glazing arrangement, although corresponding mechanical loads or their effects in the form of vibrations etc. of the glazing arrangement decay relatively quickly, for example in the range of 1 ⁇ s to 10 ms can.
  • optical decoupling signal of the optical waveguide structure 30 to make a distinction as to the occurrence of any short-term mechanical stress whose effects dissipate relatively rapidly and thermal stress due to thermal stress relatively slow heat propagation across the glazing assembly with a greater time delay adjacent Bragg grating only at a distance of a few seconds to minutes reached, depending on the distance of the respective Bragg grating and the specific disk structure.
  • the occurrence of different mechanical stresses and thermal stresses of the glazing assembly or their respective local distribution corresponding to the distribution of the plurality of Bragg filters on the planar glazing element can be resolved very accurately when the read-out frequency is chosen sufficiently high.
  • the changes ⁇ B of the optical properties of each Bragg filter can be used to detect both the occurrence of mechanical stresses (or different mechanical stresses) and thermal stresses (or different thermal stresses) of the glazing assembly and their respective local distribution.
  • a thermally conductive foil i. H. a film with a heat-conducting property increased in relation to the surrounding glass material
  • a thermal heat source to a sufficiently high heating of the glass material in the vicinity of a Bragg in real time Filter element in the optical waveguide structure 30 to immediately detect (within a few seconds) a tamper indicating heat action.
  • FIG. 5 An exemplary embodiment of a basic method 100 for detecting a mechanical or thermal stress of a planar glazing element is described, wherein an optical waveguide structure with an optical filter element is arranged on the planar glazing element.
  • an optical signal is first coupled into the optical waveguide structure in a first step 102.
  • an optical signal, eg in the form of a reflection signal or a transmission signal, of the optical waveguide structure is detected and converted into an electrical detection signal based on the detected optical signal of the optical waveguide structure (step 104).
  • This electrical detection signal or a signal derived therefrom is evaluated (step 106) in order to determine a change in the optical property of the optical waveguide structure due to a mechanical or thermal stress of the planar glazing element.
  • the electrical detection signal or the signal derived therefrom may be compared to a comparison value to determine if the detection signal is outside a desired range, indicating an exceeding of a mechanical or thermal stress limit on the sheet glazing element ,
  • the comparison value can be predefined or can be determined as a relative comparison value based on a statistical processing of a plurality of preceding measurement values of the electrical detection signal.
  • a burglar has thus relatively quickly access to the issued behind the safety glass valuables, as previous fracture sensors or vibration sensors often do not respond to the use of a gas burner and thus no alarm is triggered. For this reason, in order to identify a heat source in the security area, complex thermal imaging cameras had to be used in order to obtain timely information.
  • the concept according to the invention consists in providing a glazing arrangement (safety glass) with a reliably functioning safety function by providing an optical waveguide structure with one or more optical filter elements, such as one or more Bragg filters, on the planar glazing element, the optical waveguide structure being inside a recess or depression in a multi-layered safety glass, for example in a capillary or a milled groove, or subsequently applied to the safety glass in capillaries.
  • a glazing arrangement safety glass
  • one or more optical filter elements such as one or more Bragg filters
  • a plurality of Bragg filters within the optical waveguide structure are optically connected in series, so that the optical waveguide structure can also be used simultaneously as a rupture sensor.
  • an (at least rough) localization of the break point on the planar glazing element can also be effected.
  • a typical optical waveguide structure with an optical filter element embodied as a Bragg filter has a diameter of 80-200 ⁇ m, for example, so that it can be attached to the flat glazing element, for example, in small capillaries or milled grooves with a diameter of 200-650 ⁇ m.
  • Typical distances of adjacent rows of optical waveguides or of neighboring optical filter elements can be, for example, in the range of 10-100 or 10-40 cm. If, for example, the planar glazing element has a laminated glass, the optical waveguide structure can be located in a capillary behind the first pane (with respect to the outside of the planar glazing element).
  • the required maximum distance to the arrangement of the optical filter elements of the optical waveguide structure can be determined individually by the respective planar glazing element, i. whose thermal conductivity or thermal conductivity, are made dependent and adapted.
  • the inventive concept for a glazing arrangement with safety function can also be subsequently integrated into an existing safety glass, wherein in a subsequent installation in recesses or recesses to be provided (eg capillary or groove), the optical waveguide structure (s) to be selected by means of a film in an individually according to the respective safety glass Distance to be glued to the flat glazing element.
  • recesses or recesses to be provided eg capillary or groove
  • the optical waveguide structure (s) to be selected by means of a film in an individually according to the respective safety glass Distance to be glued to the flat glazing element.
  • precise values for the exact positioning of the optical waveguide structure with the optical filter elements can be based on the thermal conductivity or the thermal conductivity of the respective safety glass or laminated glass.
  • strain and heat sensor optical waveguide structure can now very effective (relatively) large amounts of heat, such as a gas burner, detect very quickly and almost in real time.
  • Today's gas burners have a heat radiation of more than 1900 ° Celsius and a power of over 50 kW.
  • erroneous measurements or disturbances of the measurements can be excluded, for example, that individual optical filter elements are evaluated as a reference filter or adjacent Bragg filter to prevent any incorrect assessment of a measurement result.
  • a comparison value with which the respective measured value of the reflective optical signal or a variable derived therefrom is compared can be provided with a correction factor which is determined, for example, on an average value or a quantity derived therefrom of a plurality of preceding measured values of the detection signal. Accordingly, the comparison value can also be determined based on or from an average value of all detected reflection components in the reflection signal.
  • the optical property of the optical waveguide structure in the form of the respective center wavelengths ⁇ B of the affected Bragg filter (at least in regions or up to a damage of the optical waveguide structure) will change continuously or continuously at a thermal load of the glazing assembly, which Change is evaluated accordingly and a thermal load can be assigned.
  • the optical property of the optical waveguide structure in the form of the respective center wavelengths ⁇ B of the affected Bragg filters will be relatively abrupt or damaged if the optical waveguide structure is damaged change, whereby this change is evaluated accordingly and a mechanical load can be assigned.
  • the glazing arrangement with safety function according to the invention is not only applicable for the prevention or detection of burglary, but also in safety-relevant applications in which planar glazing elements are exposed, for example, strong thermal or mechanical loads and also determines any increased mechanical or thermal load conditions as quickly as possible or almost in real time should be.
  • the glazing arrangement according to the invention with safety function on the windshield of a train cockpit or other vehicle or rail vehicle used and monitored according to the procedure of the invention it should be noted that an optical waveguide structure with an optical filter element, which is designed as a break, strain or thermal sensor, is substantially insensitive to electrical or electromagnetic interference signals and thus extremely reliable and insensitive to interference can perform the respective monitoring function.
  • the inventive glazing arrangement with safety function thus enables the optical waveguide structure designed as strain, fracture and thermal sensor to directly supply the required information with regard to the mechanical or thermal stress of the planar glazing element to be monitored, and thus no different sensor types for detecting heat, strain and fracture needed.
  • the optical waveguide structure designed as strain, fracture and thermal sensor to directly supply the required information with regard to the mechanical or thermal stress of the planar glazing element to be monitored, and thus no different sensor types for detecting heat, strain and fracture needed.
  • the inventive concept for a safety glass can thus be used everywhere where valuables or other goods are to be secured against unauthorized access or access, such as e.g. Banks, jewelers, department stores, etc.
  • the inventive concept can be used equally on flat glazing elements that are relatively strong mechanical or thermal stresses exposed to use, as early as possible to excessive mechanical or thermal stress of the respective planar glazing element or almost in real time.
  • aspects have been described in the context of a device, it will be understood that these aspects also constitute a description of the corresponding method, so that a block or a component of a device is also to be understood as a corresponding method step or as a feature of a method step. Similarly, aspects described in connection with or as a method step also represent a description of a corresponding block or detail or feature of a corresponding device.
  • Some or all of the method steps may be performed by a hardware device (or using a hardware device). Device), such as a microprocessor, a programmable computer or an electronic circuit. In some embodiments, some or more of the most important method steps may be performed by such an apparatus (sensor interrogator).
  • embodiments of the invention may be implemented in hardware or in software.
  • the implementation may be performed using a digital storage medium, such as a floppy disk, a DVD, a Blu-ray Disc, a CD, a ROM, a PROM, an EPROM, an EEPROM or FLASH memory, a hard disk, or other magnetic disk or optical memory are stored on the electronically readable control signals that interact with a programmable computer system so can or can work together to carry out the respective procedure. Therefore, the digital storage medium can be computer readable.
  • some embodiments according to the invention include a data carrier having electronically readable control signals capable of interacting with a programmable computer system such that one of the methods described herein is performed.
  • embodiments of the present invention may be implemented as a computer program product having a program code, wherein the program code is operable to perform one of the methods when the computer program product runs on a computer.
  • the program code can also be stored, for example, on a machine-readable carrier.
  • Other embodiments include the computer program for performing any of the methods described herein, wherein the computer program is stored on a machine-readable medium.
  • an embodiment of the method according to the invention is thus a computer program which has a program code for performing one of the methods described herein when the computer program runs on a computer.
  • a further embodiment of the inventive method is thus a data carrier (or a digital storage medium or a computer-readable medium) on which the computer program is recorded for carrying out one of the methods described herein.
  • Another embodiment includes a processing device, such as a computer or a programmable logic device, that is configured or adapted to perform one of the methods described herein.
  • a processing device such as a computer or a programmable logic device, that is configured or adapted to perform one of the methods described herein.
  • Another embodiment includes a computer on which the computer program is installed to perform one of the methods described herein.
  • a programmable logic device eg, a field programmable gate array, an FPGA
  • a field programmable gate array may cooperate with a microprocessor to perform one of the methods described herein.
  • the methods are performed by any hardware device. This can be a universally applicable Hardware such as a computer processor (CPU) or hardware specific to the process, such as an ASIC.
  • a glazing security system 70 includes a glazing assembly 10 having a security function with a planar glazing element 20; and an optical waveguide structure 30 having an optical filter element 32; wherein the optical waveguide structure 30 is mechanically arranged on the glazing element 20 in order to cause a change in an optical property of the optical waveguide structure 30 under mechanical stress of the planar glazing element 20, and furthermore upon thermal stress of the planar glazing element 20, a change in an optical property of the optical waveguide structure 30 to effect; a signal input device 80 for coupling an optical signal S 1 into the optical waveguide structure 30; a signal detecting means 82 for detecting an optical signal S R; S Tr of the optical waveguide structure 30 and outputting an electrical detection signal S e based on the detected optical signal S R , S Tr ; and a processing device 90 for driving the signal input device 80 and for evaluating the detection signal provided by the signal detection device 82, wherein the processing device 90 is designed to detect a change in the optical property of the optical waveguide structure 30, 32 due to a mechanical stress of the
  • the optical filter element 32 further comprises a Bragg filter or a plurality of Bragg filters.
  • the optical waveguide structure 30 of the security system comprises a plurality of serially arranged, spaced-apart optical filter elements 32 in the form of Bragg filters, the Bragg filters each having a different filter center wavelength.
  • the optical waveguide structure 30 is further arranged such that the Bragg filters 32 are arranged in a distributed arrangement or in a grid on the planar glazing element 20.
  • the optical waveguide structure of the security system is positively, positively or materially connected to the planar glazing element 20.
  • the optical waveguide structure 30 of the security system is integrated with the optical filter elements 32 in the material of the glazing element.
  • the change in the optical property of the optical waveguide structure of the security system is based on a force- and / or temperature-dependent material strain or on a temperature-dependent refractive index change of the material of the optical filter element designed as a Bragg filter.
  • the security system further has a further optical waveguide structure 30 'with at least one further optical filter element 32' in the form of a Bragg filter.
  • the further optical waveguide structure 30 'furthermore has a plurality of serially arranged, spaced-apart optical, further filter elements 32' in the form of Bragg filters, the Bragg filters each having a different filter center wavelength.
  • the processing device 90 is further configured to evaluate the detection signal S e or a signal derived therefrom in order to determine a spatial association of the acting mechanical or thermal load on the glazing element based on a filter element 32 'affected by an acting mechanical and / or thermal stress ,
  • the processing unit 90 of the safety system is designed to compare the detection signal S e or a signal derived therefrom with a comparison value in order to determine whether the detection signal S e is within or outside a desired range, leaving the desired range indicates an exceeding of a limit value for a mechanical or thermal load of the planar glazing element 10.
  • the processing unit 90 of the security system is designed to evaluate the detection signal S e as to whether the optical property of the optical waveguide structure in the form of the respective center wavelengths ⁇ B of the relevant Bragg filters changes continuously or continuously in order to determine a thermal load , and wherein the processing device 90 is further configured to evaluate the detection signal S e to determine whether the optical property of the optical waveguide structure in the form of the respective center wavelengths ⁇ B of the affected Bragg filter changes abruptly or abruptly to determine a mechanical load.
  • the comparison value of the security system is based on an average or a derived quantity of a plurality of preceding ones Measured values of the detection signal of a Bragg filter or a plurality of Bragg filters based.
  • the detection signal S e or the signal derived therefrom of the safety system is based on a center wavelength ⁇ B of the respective Bragg filter or on a power level of the detected signal.
  • the processing device 90 of the security system is designed to output an indication or alarm signal S out if exceeding a limit value for mechanical or thermal loading of the planar glazing element 20 occurs.
  • the signal detection device 2 of the safety detection system is designed to read the optical signal S R , S Tr of the optical waveguide structure 30 at a read-out frequency of at least 1 kHz.
  • the processing device 90 of the safety detection system is designed to evaluate the detection signal in order to determine a local distribution of the mechanical stress over the planar glazing element under mechanical stress of the planar glazing element 20, and also in the case of thermal stress of the planar surface Glazing element 20 to determine a local distribution of the thermal stress on the planar glazing element 20.
  • a safety glazing assembly 10 includes a planar glazing element 20; and an optical waveguide structure 30 having an optical filter element 32; wherein the optical waveguide structure 30 is mechanically arranged on the glazing element 20 in order to cause a change in an optical property of the optical waveguide structure 30 under mechanical stress of the planar glazing element 20, and furthermore upon thermal stress of the planar glazing element 20, a change in an optical property of the optical waveguide structure 30 to effect.
  • the optical filter element 32 further comprises a Bragg filter or a plurality of Bragg filters.
  • the optical waveguide structure 30 of the glazing assembly includes a plurality of serially arranged spaced apart optical filter elements 32 in the form of Bragg filters, wherein the Bragg filters each have a different filter center wavelength.
  • the optical waveguide structure 30 is further arranged such that the Bragg filters 32 are arranged in a distributed arrangement or in a grid on the planar glazing element 20.
  • the optical waveguide structure of the glazing arrangement is connected to the planar glazing element 20 in a positive, non-positive or cohesive manner.
  • the optical waveguide structure 30 of the glazing assembly is integrated with the optical filter elements 32 in the material of the glazing element.
  • the change in the optical property of the optical waveguide structure of the glazing arrangement is based on a force- and / or temperature-dependent material strain or on a temperature-dependent refractive index change of the material of the optical filter element designed as a Bragg filter.
  • the glazing arrangement furthermore has a further optical waveguide structure 30 'with at least one further optical filter element 32' in the form of a Bragg filter.
  • the further optical waveguide structure 30 'furthermore has a plurality of serially arranged, spaced-apart optical, further filter elements 32' in the form of Bragg filters, the Bragg filters each having a different filter center wavelength.
  • a method for detecting a mechanical or thermal stress of a planar glazing element 20 wherein on the planar glazing element 20, an optical waveguide structure 30 is mechanically arranged with an optical filter element 32, a coupling 102 of an optical signal in the optical waveguide structure; detecting 104 an optical signal of the optical waveguide structure and generating an electrical detection signal based on the detected optical signal of the optical waveguide structure; an evaluation 106 of the electrical detection signal or a signal derived therefrom in order to determine a change in the optical property of the optical waveguide structure due to a mechanical stress of the planar glazing element, and further to a change in the to determine optical property of the optical waveguide structure due to thermal stress of the planar glazing element.
  • the method further comprises comparing 108 the electrical detection signal or the signal derived therefrom with a comparison value to determine if the detection signal is outside a desired range, indicating an exceeding of a mechanical or thermal stress limit of the planar glazing element ,
  • the method further comprises evaluating the electrical detection signal S e as to whether the optical property of the optical waveguide structure in the form of the respective center wavelengths ⁇ B of the relevant Bragg filters changes continuously or continuously in order to determine a thermal load Evaluation of the electrical detection signal S e to the effect of whether the optical property of the optical waveguide structure in the form of the respective center wavelengths ⁇ B of the affected Bragg filter abruptly or abruptly changes to determine a mechanical load.
  • the comparison value is further fixed or is determined on the basis of a statistical processing of a plurality of preceding measured values of the electrical detection signal of one or a plurality of Bragg filters.
  • the method further comprises evaluating the detection signal S e or a signal derived therefrom, based on a filter element 32 'affected by an acting mechanical and / or thermal stress, a spatial allocation of the acting mechanical or thermal load on the glazing element to investigate.
  • Another aspect has a computer program with a program code for carrying out the method for detecting a mechanical or thermal stress of a planar glazing element 20, wherein on the planar glazing element 20, an optical waveguide structure 30 is mechanically arranged with an optical filter element 32, the coupling 102 of an optical Signal in the optical waveguide structure; detecting 104 an optical signal of the optical waveguide structure and generating an electrical detection signal based on the detected optical signal of the optical waveguide structure; an evaluation 106 of the electrical detection signal or a signal derived therefrom to a change in the optical property of the optical waveguide structure due to a mechanical stress of the planar To determine glazing element, and also to determine a change in the optical property of the optical waveguide structure due to thermal stress of the planar glazing element when the program runs on a computer or a microprocessor.

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Claims (15)

  1. Système de sécurité (70) pour un vitrage, aux caractéristiques suivantes:
    un ensemble de vitrage (10) à fonction de sécurité avec un élément de vitrage plat (20); et une structure de guide d'ondes de lumière (30) avec un élément de filtre optique (32); dans lequel la structure de guide d'ondes de lumière (30) est disposée mécaniquement sur l'élément de vitrage (20) pour provoquer, en cas de sollicitation mécanique de l'élément de vitrage plat (20), une modification d'une propriété optique de la structure de guide d'ondes de lumière (30), et pour provoquer par ailleurs, en cas de sollicitation thermique de l'élément de vitrage plat (20), une modification d'une propriété optique de la structure de guide d'ondes de lumière (30), l'élément de filtre optique (32) présentant un filtre de Bragg ou une pluralité de filtres de Bragg;
    un dispositif de couplage de signal (80) destiné à coupler un signal optique (S1) dans la structure de guide d'ondes de lumière (30);
    un moyen de détection de signal (82) destiné à détecter un signal optique (SR; STr) de la structure de guide d'ondes de lumière (30) et à sortir un signal de détection électrique (Se) sur base du signal optique détecté (SR, STr); et
    un moyen de traitement (90) destiné à activer le dispositif de couplage de signal (80) et à évaluer le signal de détection mis à disposition par le moyen de détection de signal (82),
    dans lequel le moyen de traitement (90) est réalisé pour déterminer une modification de la propriété optique de la structure de guide d'ondes de lumière (30, 32) sur base d'une sollicitation mécanique de l'élément de vitrage plat (20), et pour déterminer par ailleurs une modification de la propriété optique de la structure de guide d'ondes de lumière (30, 32) sur base d'une sollicitation thermique de l'élément de vitrage plat (20), et est réalisé par ailleurs pour distinguer entre la modification de la propriété optique de la structure de guide d'ondes de lumière (30, 32) sur base d'une charge mécanique et la modification de la propriété optique de la structure de guide d'ondes de lumière (30, 32) sur base d'une charge thermique; et
    dans lequel le moyen de traitement (90) est par ailleurs réalisé pour évaluer le signal de détection (Se) pour savoir si la propriété optique de la structure de guide d'ondes de lumière sous forme de la longueur d'onde moyenne respective λB du filtre de Bragg concerné varie de manière constante ou en continu, pour déterminer une sollicitation thermique, et dans lequel le moyen de traitement (90) est par ailleurs réalisé pour évaluer le signal de détection (Se) pour savoir si la propriété optique de la structure de guide d'ondes de lumière sous forme de la longueur d'onde moyenne respective λB du filtre de Bragg concerné varie de manière abrupte ou par sauts, pour déterminer une sollicitation mécanique.
  2. Système de sécurité selon la revendication 1, dans lequel la structure de guide d'ondes de lumière (30) présente une pluralité d'éléments de filtre optiques (32) sous forme de filtres de Bragg disposés en série, distants l'un de l'autre, les filtres de Bragg présentant, chacun, une longueur d'onde moyenne de filtre différente.
  3. Système de sécurité selon l'une des revendications précédentes, dans lequel la structure de guide d'ondes de lumière est connectée en liaison de forme, de force ou d'étanchéité aux poussières à l'élément de vitrage plat (20).
  4. Système de sécurité selon l'une des revendications précédentes, dans lequel la structure de guide d'ondes de lumière (30) avec les éléments de filtre optique (32) est intégré dans le matériau de l'élément de vitrage.
  5. Système de sécurité selon l'une des revendications précédentes, par ailleurs aux caractéristiques suivantes:
    une autre structure de guide d'ondes de lumière (30') avec au moins un autre élément de filtre optique (32i) sous forme d'un filtre de Bragg.
  6. Système de sécurité selon l'une des revendications précédentes, dans lequel le moyen de traitement (90) est réalisé pour comparer le signal de détection (Se) ou un signal dérivé de ce dernier avec une valeur de comparaison, pour déterminer si le signal de détection (Se) se situe dans ou en-dehors d'une plage de consigne, le fait de sortir de la plage de consigne indiquant un dépassement d'une valeur limite pour une charge mécanique ou thermique de l'élément de vitrage plat (10).
  7. Système de sécurité selon l'une des revendications précédentes, dans lequel la valeur de comparaison se base sur une valeur moyenne ou une grandeur dérivée de cette dernière d'une pluralité de valeurs de mesure précédentes du signal de détection d'un filtre de Bragg ou d'une pluralité de filtres de Bragg.
  8. Système de sécurité selon l'une des revendications précédentes, dans lequel le signal de détection (Se) ou le signal dérivé de ce dernier se base sur une longueur d'onde moyenne (λB) du filtre de Bragg respectif ou sur un niveau de puissance du signal détecté.
  9. Système de sécurité selon l'une des revendications précédentes, dans lequel le moyen de détection de signal (82) est réalisé pour lire le signal optique (SR, STr) de la structure de guide d'ondes de lumière (30) à une fréquence de lecture d'au moins 1 kHz.
  10. Système de sécurité selon l'une des revendications précédentes, dans lequel le moyen de traitement (90) est réalisé pour évaluer le signal de détection pour déterminer, en cas de sollicitation mécanique de l'élément de vitrage plat, une répartition locale de la sollicitation mécanique sur l'élément de vitrage plat (20), et par ailleurs pour déterminer, en cas de sollicitation thermique de l'élément de vitrage plat (20), une répartition locale de la sollicitation thermique sur l'élément de vitrage plat (20).
  11. Procédé pour détecter une sollicitation mécanique ou thermique d'un élément de vitrage plat (20), sur l'élément de vitrage plat (20) étant disposée mécaniquement une structure de guide d'ondes de lumière (30) avec un élément de filtre optique (32), l'élément de filtre optique (32) présentant un filtre de Bragg ou une pluralité de filtres de Bragg, aux étapes suivantes consistant à:
    coupler (102) un signal optique dans la structure de guide d'ondes de lumière;
    détecter (104) un signal optique de la structure de guide d'ondes de lumière et générer un signal de détection électrique sur base du signal optique détecté de la structure de guide d'ondes de lumière;
    évaluer (106) le signal de détection électrique ou un signal dérivé de ce dernier, pour déterminer une modification de la propriété optique de la structure de guide d'ondes de lumière sur base d'une sollicitation mécanique de l'élément de vitrage plat, et pour déterminer par ailleurs une modification de la propriété optique de la structure de guide d'ondes de lumière sur base d'une sollicitation thermique de l'élément de vitrage plat, et pour distinguer par ailleurs entre la modification de la propriété optique de la structure de guide d'ondes de lumière (30, 32) sur base d'une sollicitation mécanique et la modification de la propriété optique de la structure de guide d'ondes de lumière (30, 32) sur base d'une sollicitation thermique;
    évaluer le signal de détection électrique (Se) pour savoir si la propriété optique de la structure de guide d'ondes de lumière sous forme de la longueur d'onde moyenne respective λB du filtre de Bragg concerné varie de manière constante ou en continu, pour déterminer une charge thermique, et
    évaluer le signal de détection électrique (Se) pour savoir si la propriété optique de la structure de guide d'ondes de lumière sous forme de la longueur d'onde moyenne respective λB du filtre de Bragg concerné varie de manière abrupte ou par sauts, pour déterminer une charge mécanique.
  12. Procédé selon la revendication 11, par ailleurs à l'étape suivante consistant à:
    comparer (108) le signal de détection électrique ou le signal dérivé de ce dernier avec une valeur de comparaison, pour déterminer si le signal de détection se situe en-dehors d'une plage de consigne, cela indiquant un dépassement d'une valeur limite pour une charge mécanique ou thermique de l'élément de vitrage plat.
  13. Procédé selon la revendication 11 ou 12, dans lequel la valeur de comparaison est prédéterminée de manière fixe ou est déterminée sur base d'un traitement statistique d'une pluralité de valeurs de mesure précédentes du signal de détection électrique d'un ou d'une pluralité de filtres de Bragg.
  14. Procédé selon l'une des revendications 11 à 13, par ailleurs aux étapes suivantes consistant à:
    évaluer le signal de détection (Se) ou un signal dérivé de ce dernier pour déterminer, sur base d'un élément de filtre (32') concerné par une charge mécanique et/ou thermique agissante, une association spatiale de la charge mécanique ou thermique agissante à l'élément de vitrage.
  15. Programme d'ordinateur avec un code de programme pour réaliser le procédé selon l'une des revendications 11 à 14 lorsque le programme est exécuté sur un ordinateur ou un microprocesseur.
EP12703003.9A 2011-01-24 2012-01-24 Système de sécurité pour ensemble de vitrage et procédé de détection d'une sollicitation mécanique ou thermique d'un élément de vitrage plan Active EP2668643B1 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE201110003073 DE102011003073B4 (de) 2011-01-24 2011-01-24 Sicherheitssystem zur Erfassung eines Einbruchversuchs an einer Sicherheitsverglasung
PCT/EP2012/051057 WO2012101126A1 (fr) 2011-01-24 2012-01-24 Système de sécurité pour ensemble de vitrage, ensemble de vitrage avec fonction de sécurité et procédé de détection d'une sollicitation mécanique ou thermique d'un élément de vitrage plan

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EP2668643A1 EP2668643A1 (fr) 2013-12-04
EP2668643B1 true EP2668643B1 (fr) 2015-12-09

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DE102018108399B4 (de) * 2018-04-10 2024-02-29 Dr. Ing. H.C. F. Porsche Aktiengesellschaft Kraftfahrzeugkarosserieelement mit einem Formüberwachungssystem für eine Kraftfahrzeugkarosserie
CN110714505A (zh) * 2019-10-08 2020-01-21 天津瀚侨车体制造有限公司 一种用于挖掘机防辐射驾驶室的框架

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EP2668643A1 (fr) 2013-12-04
DE102011003073A1 (de) 2012-07-26
WO2012101126A1 (fr) 2012-08-02

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