EP3811343B1 - Procédé et capteur de contrôle de documents - Google Patents

Procédé et capteur de contrôle de documents Download PDF

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Publication number
EP3811343B1
EP3811343B1 EP19733663.9A EP19733663A EP3811343B1 EP 3811343 B1 EP3811343 B1 EP 3811343B1 EP 19733663 A EP19733663 A EP 19733663A EP 3811343 B1 EP3811343 B1 EP 3811343B1
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EP
European Patent Office
Prior art keywords
spectral
document
detector
excitation light
luminescence
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EP19733663.9A
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German (de)
English (en)
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EP3811343A1 (fr
Inventor
Wolfgang Deckenbach
Julia DANHOF
Ulf EHRHARDT
Martin Clara
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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

Definitions

  • the invention relates to a method and a sensor for checking documents, e.g. documents of value, in particular for checking the authenticity of documents, e.g. documents of value.
  • the luminescence of an examined value document is checked, for example, to distinguish genuine value documents from counterfeits.
  • the counterfeit documents of value to be recognized can be composed counterfeits, which are assembled from parts of different documents of value.
  • the composed forgeries can be composed of parts of genuine and forged documents of value. There are many suggestions for detecting composed forgeries, each of which will detect some composed forgeries but not others.
  • One way of detecting composed forgeries is if the substrate of the genuine value document is provided with a luminescent substance over its entire surface, but the forged section of the composed forgery was made from a non-luminescent substrate.
  • a composed forgery can be recognized by the fact that the luminescence is not fully present, but is missing in some places of the composed forgery (in the forged section of the composed forgery).
  • reflectance and luminescence measurement can be carried out at almost the same value document position. This is possible both statically, ie without relative movement between the document of value and the detector, but also in the case when the document of value and the detector are transported relative to one another. In the latter case, the measurement times for the remission and luminescence measurement should follow each other accordingly. Since only exactly one detector is used to detect the reflectance measurement value and the luminescence measurement value, an additional detector for reflectance measurement can be dispensed with.
  • the measured reflectance value can be falsified by luminescence occurring at the same time as the reflectance (in the case of fast-growing luminescence, for example organic luminescent substances).
  • a superimposition of remission and luminescence is detected during illumination with excitation light.
  • the reflectance measured value detected during illumination with excitation light then contains a proportion of the reflectance intensity and a proportion of the luminescence intensity.
  • One Quantitative evaluation of the measured remission value is made more difficult due to the falsification caused by the luminescence occurring at the same time as the illumination.
  • the invention is based on the idea of reducing the falsification of the reflectance measured value due to the luminescence (occurring at the same time as the reflectance) in that the excitation light in the detection beam path is not blocked as much as is otherwise usual, but part of the excitation light is targeted up to is passed to the detector. This ensures that the part of the excitation intensity that hits the detector far exceeds the luminescence intensity that occurs at the same time as the excitation. Because with the same illumination intensity or excitation intensity of the value document, a significantly increased remission intensity is then detected, while the detected luminescence intensity remains the same (since the excitation intensity impinging on the value document remains unchanged).
  • the relative proportion of the remitted excitation intensity in the reflectance measured value detected during the illumination thus increases sharply in comparison to the relative proportion of the luminescence.
  • the reflectance measured value detected during the illumination is therefore no longer or only slightly falsified by the luminescence emitted during the illumination with excitation light.
  • the same detector is used to record both measured values, ie the remission measured value and the luminescence measured value. If the detector comprises a plurality of sections that can be read out separately from one another, the same detector sections are illuminated and read out when the two measured values are recorded.
  • the luminescence of the security feature to be detected can be a phosphorescence and the respective Luminescence measurement value can be a phosphorescence measurement value of the document of value.
  • the spectral detection filter located in the detection beam path has a transmission of at least 0.5% in the spectral range of the excitation light.
  • the maximum of the transmission spectrum in the spectral range of the excitation light is at least 0.5%. This increased transmission of the spectral detection filter ensures that the excitation intensity hitting the detector far exceeds the luminescence intensity occurring at the same time as the excitation.
  • the spectral detection filter preferably has a transmission in the range from 0.5% to 20%, preferably in the range from 1% to 10%, in the spectral range of the excitation light.
  • a blocking filter is usually installed in the detection beam path between the document of value and the detector, which only lets the luminescence light through and blocks as far as possible all spectral ranges that are not to be detected, i.e. the excitation light is also almost completely blocked.
  • a blocking filter is used for this purpose, which specifically reduces the spectral range of the excitation light by a factor of 10 4 to 10 6 in order to ensure that as far as possible only the luminescence is measured.
  • the invention can be used for any type of value document check in which both remission measured values and luminescence measured values of a value document are evaluated.
  • the invention enables improved detection of remission measurement values and luminescence measurement values at almost the same value document position in order to compare these measurement values with one another.
  • This can be used as part of an authenticity check that seeks to detect composed forgeries aims, but also for other authenticity checks in which the luminescence of the value document is checked.
  • the luminescent substance to be checked can be present over the entire surface of the document of value or in the substrate of the document of value or only in one or more partial areas.
  • the spectral detection filter only transmits a portion of the excitation light remitted by the document of value.
  • the excitation light remitted by the document of value is partially absorbed or reflected by the spectral detection filter.
  • the spectral detection filter transmits at least a 0.5% portion of the excitation light incident on the spectral detection filter that was remitted by the document of value, but preferably at most a portion of 20% of the excitation light incident on the spectral detection filter that was remitted by the document of value.
  • the luminescence light of the document of value is preferably transmitted almost completely through the spectral detection filter.
  • the spectral detection filter preferably has a transmission of at least 80%.
  • the maximum of the transmission spectrum in the spectral range of the luminescent light is at least 80%.
  • the maximum transmission that the spectral detection filter has in the spectral range of the luminescence light is preferably greater by at least a factor of four than the maximum transmission that it has in the spectral range of the excitation light.
  • the spectral detection filter differs from common neutral density filters in that its transmission depends on the wavelength of the light incident on the spectral detection filter (i.e. its transmission spectrum is not uniform over all wavelengths).
  • the spectral detection filter is a bandpass filter with at least two transmission bands, in particular an interference filter.
  • the spectral detection filter has a transmission spectrum that has a (spectral) luminescence transmission band in the spectral range of the luminescence light of the document of value and one or more additional (spectral) transmission bands in the spectral range of the excitation light.
  • the luminescence transmission band overlaps spectrally with the luminescence light of the document of value.
  • the luminescence transmission band can partially overlap spectrally with the luminescent light of the document of value or can completely enclose it spectrally.
  • the at least one additional transmission band overlaps spectrally with the excitation light.
  • the transmission spectrum of the spectral detection filter can, for example, have an additional transmission band that spectrally completely encloses the excitation light.
  • the additional transmission band(s) can partially overlap spectrally with the excitation light.
  • the luminescence transmission band and the at least one additional transmission band are, for example, spectrally separated from one another (in particular not spectrally overlapping).
  • the transmission spectrum of the spectral detection filter--with appropriate modulation of the transmittance--can also extend continuously from the spectral range of the luminescence light to the spectral range of the excitation light.
  • the spectral detection filter preferably has a greater transmission in its luminescence transmission band than in its additional one(s). transmission band/s.
  • the maximum transmission in its luminescence transmission band is at least a factor of 4 greater than the maximum transmission in the at least one additional transmission band.
  • the detection filter has a uniform spectral transmission laterally (in the plane of the detection filter). Each lateral section of the spectral detection filter therefore has the same spectral transmission. Both the luminescence light of the document of value impinging on the spectral detection filter and at least 0.5% of the excitation light impinging on the spectral detection filter (remitted by the document of value) are transmitted through the spectral detection filter—in each case at the same lateral position of the detection filter.
  • the spectral detection filter thus transmits the luminescence light impinging on it and the excitation light impinging on it independently of the lateral position along the spectral detection filter.
  • the spectral detection filter has the luminescence transmission band and the at least one additional transmission band each at the same lateral position along the spectral detection filter.
  • the at least one additional transmission band is preferably at a spectral distance of at least 10 nm, preferably at least 20 nm, from the at least one luminescence transmission band. at which the transmission of the respective transmission band has dropped to 50% of the maximum value of the respective transmission band.
  • the spectrum of the excitation light can have a spectral excitation band that has an upper spectral edge (long-wavelength side of the spectrum) and a lower spectral edge (short-wavelength side of the spectrum).
  • the spectral detection filter has a first additional spectral transmission band that is spectrally in the lower spectral edge of the excitation band and a second additional spectral transmission band that is spectrally in the upper spectral edge of the excitation band.
  • a temperature drift of the excitation band has little or no influence on the level of the spectral detection filter transmitted excitation intensity.
  • the same advantage is achieved if the additional spectral transmission band of the spectral detection filter spectrally completely encloses the excitation band of the excitation light.
  • the document of value With some sensors, it is common for the document of value to be transported relative to the detector during detection, for example to be transported past it. This can be done at a relatively low speed of 0.1-1 m/s, but preferably at a high speed of 1-15 m/s.
  • the respective remission measured value is then detected in a first detection area of the document of value and the respective luminescence measured value, which is detected immediately after the reflectance measured value, in a second detection area of the document of value.
  • the reflectance measured value is detected at a point in time at which the respective first detection area is illuminated with an excitation light pulse of the excitation light.
  • the respective luminescence measurement value is detected at a point in time at which the second Detection area is no longer illuminated with an excitation light pulse of the excitation light.
  • the time interval between the detection of the remission measured value and the detection of the luminescence measured value is preferably chosen such that the respective first and second detection area, the first and second measured value of which are detected immediately one after the other, in terms of area (measured by their area on the document of value) overlap at least 50%, preferably at least 80%.
  • the relatively high transmission of the spectral detection filter in the spectral range of the excitation light means that the detector detects an increased intensity during illumination with excitation light, which usually far exceeds the luminescence intensity.
  • the transmission of the detection filter in the spectral range of the excitation light is not as great as in the case of a large falsification.
  • conventional photodetectors, amplifier circuits and A/D converters are suitable for determining both the low intensity of the luminescent light when the illumination is switched off and the intensity of the excitation light during illumination.
  • the detector detects the respective remission measured value and the respective luminescence measured value with the same sensitivity.
  • the dynamic range of the measurement is then large enough that both the remission measured value and the luminescence measured value can be detected without overdriving.
  • the transmission of the spectral detection filter is selected in particular in such a way that it is somewhat lower in the spectral range of the excitation light than the transmission from which the intensity of the excitation light transmitted through the detection filter increases detection is overridden.
  • one or more photodiodes of the material systems Si, Ge, InAs or InGaAs are preferably used as a detector.
  • the photocurrents thus detected can be processed with a transimpedance converter of suitable amplification and subsequent digitization with a sufficiently large dynamic range. This is preferably done linearly over the dynamic range.
  • the luminescent substance of the bank note to be detected occurs quickly (i.e. the measured remission value is strongly falsified), a relatively high transmission of the detection filter in the spectral range of the excitation light is required in order to keep the falsification low. However, this leads to a relatively high intensity for the measured remission value during illumination with excitation light.
  • the dynamic range during detection in particular the dynamic range of the amplifier circuit and/or the A/D converter, is not sufficient (so that the measured value saturates when the remission measured value is detected)
  • the measurement signals are recorded with carried out with different sensitivities.
  • the sensitivity of the detector is reduced for reflectance measurement during illumination with excitation light.
  • the measured reflectance value detected by the detector and the measured luminescence value detected by the detector can be measured with different sensitivities, the measured reflectance value being measured with a lower sensitivity than the measured luminescence value.
  • the control device can be set up to switch over the detector or an electronic circuit connected to it (for example an amplifier circuit) in such a way that the remission measured value has a lower sensitivity is measured as the luminescence reading. For example, in the period between the detection of the respective remission measured value and the respective luminescence measured value, a sensitivity setting of the detector or of an amplifier connected to the detector or of a current-voltage converter connected to the detector can be switched so that the remission -measured value is measured with lower sensitivity than the luminescence measured value.
  • the bias voltage of the detector or the gain of the electronic amplifier which amplifies the output signal of the detector, or the transimpedance of a current-to-voltage converter connected to the detector be switched over in such a way that the remission measured value is detected with less sensitivity than the luminescence measured value.
  • the sensitivity can be switched over by a switching signal from the control device, which is generated synchronously with the excitation light pulses, for example.
  • the sensitivity setting of the detector is preferably switched over immediately before the start of the excitation light pulse in such a way that the remission measured value is detected with lower sensitivity than the luminescence measured value, and switched back again immediately after the end of the excitation light pulse for the detection of the reflectance measured value.
  • the sensitivity can be switched with a switching time of 50 ⁇ s to 1 ms, preferably with a switching time of 70 ⁇ s to 300 ⁇ s.
  • the controller may be a processor programmed with appropriate software to control the illuminator and detector.
  • the processor can also be configured to generate a control signal that switches the sensitivity of the detector.
  • the evaluation device can also be a processor with the appropriate Software for evaluating the reflectance and luminescence measurements is programmed.
  • the processor is set up, for example, to analyze the measurement signals and to assess the authenticity, and it outputs the result of the authenticity assessment or forwards it for further processing.
  • the control device and the evaluation device can be different devices or can be formed by the same device, which is set up both to control the illumination device and the detector and to check the document of value based on the at least one remission measured value detected by the detector and based on the at least one luminescence measurement value detected by the detector.
  • the same processor can be used for both.
  • the detector is in particular a semiconductor-based detector, e.g. a photodiode, preferably with a charge carrier lifetime of at most 20 ⁇ s. Despite intensive irradiation with excitation light, the detector is then able to detect low intensities again after a short time. This allows a faster measurement or a short time interval between the two measurements and thus a large spatial overlap of the detection areas, especially in the case of high transport speeds of the document of value.
  • a detection beam path formed between the document of value and the detector contains a spectral detection filter whose spectral transmission is selected such that the luminescence light of the document of value impinging on the spectral detection filter and at least 0.5% of the excitation light impinging on the spectral detection filter, which was remitted by the document of value, is transmitted.
  • the evaluation can be based on a single discrete remission or luminescence measurement value or on the basis of several of the respective measurement values that are offset against each other (eg averaged).
  • the measured values can be detected at discrete points in time or by temporal integration over a period of time within the respective excitation pulse (for the reflectance measured value) or after the end of the respective excitation pulse (for the luminescence measured value). Between each two excitation light pulses there can also be two or more Luminescence measurement values are detected with different time intervals from the respective excitation light pulse and these luminescence measurement values are used to check the document of value, for example offset against one another.
  • the document of value and the detector can be moved relative to each other and the lighting along the document of value can be switched on and off alternately. Alternatively, the illumination and detection can also take place without relative movement.
  • the documents whose authenticity is checked using the method according to the invention and the sensor are, in particular, documents of value, for example banknotes, tickets, cheques, coupons, vouchers, etc.
  • documents of value for example banknotes, tickets, cheques, coupons, vouchers, etc.
  • other documents e.g. ID documents, can also be checked using the method according to the invention and the sensor .
  • a device for checking documents for example documents of value
  • the device can be used which has the above-mentioned sensor for checking (and optionally further sensors).
  • the device can be designed for processing documents of value, for example for checking the authenticity and/or for sorting.
  • the device can have a transport device which is set up to transport the document, eg document of value, and the detector or the sensor which has the detector relative to one another during detection, eg the document of value past the sensor or detector to transport.
  • the control device of the sensor can be set up to control the detector in such a way that the respective remission measured value and the respective luminescence measured value are detected with such a short time interval from one another that the detection ranges overlap by at least 50%, preferably by at least 80%, on the document, eg document of value, from which the respective remission measured value and the respective luminescence measured value are detected.
  • the invention is explained below using the example of the authenticity check of a banknote 3 in whose substrate a luminescent substance is introduced over the entire surface, the luminescence of which is evaluated for the authenticity check.
  • the banknote considered in this example Figure 2a has--in addition to the luminescent substance--an imprint of fluorescent printing ink 11. Furthermore, the denomination 13 of the bank note is printed and an area is provided with non-fluorescent ink 12 .
  • FIG. 1 shows a sensor 10 which is used both for detecting remission measured values and luminescence measured values of a document of value, such as banknote 3 Figure 2a , is set up.
  • the bank note 3 is transported in one direction (e.g. in 1 from right to left) past the sensor 10 so that the detector 6 can successively detect several measured values as a function of the position x along the banknote 3.
  • the same detector 6 is used to measure the remission and luminescence of the bank note.
  • the senor 10 has an illumination device with two light-emitting diodes 1a and 1b, which illuminate the banknote 3 from an oblique direction.
  • the spectral range of the lighting device is selected in such a way that the light emitted by the lighting device is designed to optically excite the luminescent substance present over the entire surface of the bank note.
  • the lighting device is switched on and off periodically in order to excite the banknote 3 to luminescence at a large number of positions x along the banknote with excitation light pulses.
  • the detection beam path 8 of the sensor 10 the light emanating from the bank note 3 passes through a front glass 2, then a lens 4, a spectral detection filter 5 and a further lens 4, which directs the light onto the detector 6.
  • the spectral detection filter 5 is used to attenuate the excitation light A.
  • the sensor 10 also has a control device 7, which provides for the periodic switching on and off of the lighting device, at specific times the detection of the remission and luminescence measurement values and forwards the reflectance and luminescence measurement values detected by the detector to the evaluation device 9, which carries out an authenticity check using the reflectance and luminescence measurement values.
  • the excitation light A of the illumination device is used both to excite the luminescence of the luminescence substance present over the entire surface and as illumination light for the remission measurement.
  • the detector 6 detects a measured remission value. After the end of the respective excitation light pulse, the detector 6 detects a measured luminescence value.
  • the remission measured value and the luminescence measured value are detected with the shortest possible time interval from one another. In this way, remission and luminescence measurement can be carried out at almost the same value document position x.
  • the detection area of the reflectance measurement (first detection area D1) and the detection area of the luminescence measurement (second detection area D2) preferably overlap by at least 80% in terms of area, cf. figure 5 .
  • the measured reflectance value can be falsified by luminescence occurring at the same time as the reflectance. So it comes from a fast onset of luminescence, as seen in Figure 3b shown results in an erroneous increase in reflectance reading.
  • a superimposition of remission and luminescence is detected, cf. 3c .
  • the measured remission value detected during illumination with excitation light in such a case does not result from the remission intensity alone, but also contains a proportion of luminescence intensity.
  • the measured remission value used for the authenticity check can therefore be falsified by luminescence occurring at the same time as the illumination.
  • the remission measured value can also be falsified by the fact that a fast-sounding additional fluorescence, such as that of the fluorescent printing ink 11, is detected, which the bank note emits in response to the excitation light pulse of the excitation light A only in the area of the fluorescent printing ink 11, cf .
  • Figures 2a and 2b the remission intensity R emanating from the bank note 3 along a line S is sketched as a function of the position x along the bank note.
  • the remission intensity of the bank note is also suppressed.
  • the fluorescence F of the fluorescent printing ink 11 emanates from the bank note 3 in this area--in addition to remission--which significantly increases the measured value detected in this area. Therefore, at the x-position of the fluorescent printing ink 11, there is also an erroneous increase in the reflectance measured value detected during the illumination with excitation light.
  • the reflectance measured values MR detected during the illumination with excitation light can therefore be falsified both in the case of a fast-sounding luminescent substance applied over the entire surface and by additional fluorescence F of other locally applied colors or fluorescent substances.
  • the measured luminescence values of a luminescent substance that is introduced over the entire surface of the substrate are examined and compared with the measured remission values of the banknote. If the falsified reflectance measured values are now used for this comparison, this can lead to an incorrect assessment of the authenticity of the respective bank note.
  • a portion of the excitation light A usually still penetrates to the detector.
  • the detector - despite the blocking filter - penetrating excitation light can have an intensity comparable to the luminescence to be detected, as is the case in the 3c is shown.
  • a blocking filter in the detection beam path 8 for the excitation light A, but using a larger proportion of the excitation light A up to the detector 6 is allowed through.
  • the low attenuation of the excitation light A in the detection beam path 8 means that the proportion of the detected excitation intensity is significantly increased, while (for falsification leading) contribution of the luminescence - due to unchanged excitation intensity of the bank note - remains the same (the excitation intensity hitting the bank note is not influenced by the changed attenuation in the detection beam path). Since the excitation intensity let through to the detector - due to the lower attenuation - is then much greater than the (falsifying) contribution that the luminescence intensity contributes to the remission measured value, the luminescence then only leads to a negligible falsification of the remission measured value.
  • the reflectance measured value MR detected at time t1 remains almost uncorrupted by the luminescence L.
  • the measured luminescence value ML is detected at time t2.
  • the falling branch of the luminescence curve 3d corresponds to that 3c , but the larger y-scaling in 3d results in the falling branch of the luminescence curve and thus also the measured luminescence value ML being further down the y-axis.
  • the reflectance measured value MR detected at time t1 is off compared to the case 3c is greatly increased.
  • the transmission of the spectral detection filter for the excitation light does not have to be increased so much. Then both the increased reflectance measured value MR and the significantly lower luminescence measured value ML can be detected with the same detector 6 with sufficient accuracy. If necessary, a special detector 6 can be used, which has a particularly large dynamic range.
  • a dynamic sensitivity switch can be carried out during the measurement.
  • a current-voltage converter with switchable gain is used for this purpose, cf 6 electronic circuit shown.
  • the control device 7 of the sensor 10 ensures that the amplification of the current-voltage converter is switched over with the aid of a semiconductor switch S1, which is optionally brought into the open or closed state via a control signal Us from the control device 7 .
  • the control device 7 opens the semiconductor switch S1 with the aid of the control signal Us so that the current-voltage converter—for the detection of the low luminescence measured value ML—has a high gain.
  • the timing of the Control signal Us preferably placed so that the semiconductor switch S1 is closed before the start of the excitation light pulse and is only opened again after the end of the excitation light pulse.
  • a semiconductor detector with a highly doped substrate is preferably used as detector 6, for example a silicon photodiode with a highly doped Si substrate.
  • a semiconductor detector is used whose substrate has a charge carrier lifetime that is significantly shorter than the time interval between the excitation light pulse and the detection of the luminescence measured value ML.
  • the charge carrier lifetime in the substrate of the semiconductor detector is preferably at most 20 ⁇ s, particularly preferably at most 10 ⁇ s. This means that the measured luminescence value ML can be detected at a very short time interval after the end of the excitation light pulse, for example as early as 50 ⁇ s-200 ⁇ s after the end of the excitation light pulse.
  • first detection area D1 the detection area of the luminescence measurement
  • second detection area D2 the detection area of the luminescence measurement
  • FIG 4a an example of the spectral profile of the excitation light A used to excite the banknote and of the luminescent light L emitted by the banknote is shown.
  • a transmission spectrum T of a spectral detection filter 5, which is located in the detection beam path 8 of the sensor 10, is shown as an example.
  • the transmission spectrum T in Figure 4a has a spectral luminescence transmission band BL in the spectral range of the luminescence light L and an additional spectral transmission band BA in the spectral range of the excitation light A, which spectrally completely encloses the spectral excitation band of the excitation light A.
  • the transmission band BL can likewise completely enclose the luminescence light, but alternatively only allow a spectral component of the luminescence light L to pass through.
  • the spectral detection filter 5 lets through, for example, 20% of the excitation light in the additional spectral transmission band BA and 95% in the spectral luminescence transmission band BL.
  • the spectral distance ⁇ F between the two transmission bands BA and BL, measured at the half-value points of the respective transmission band BA or BL, is preferably at least 10 nm, cf. Figure 4a .
  • an interference filter is used as the spectral detection filter 5, in which the transmission bands BL and BA are selected according to the spectral position of the luminescence light L and the excitation light A.
  • the transmission spectrum T of the spectral detection filter 5 can have different forms.
  • the additional spectral Transmission band BA can be positioned symmetrically or asymmetrically around the spectral curve of the excitation light A.
  • Fig. 4b-e four examples of the additional spectral transmission band BA are shown, which only partially overlap with the spectral excitation band of the excitation light A.
  • the additional spectral transmission band BA can, for example, lie in the upper spectral edge of the excitation light A (cf. Figure 4b ) or in the lower spectral edge of the excitation light A (cf. Figure 4c ).
  • the spectral shape of the additional spectral transmission bands Figures 4d and 4e is chosen so that the spectral detection filter 5 has an additional spectral transmission band in each of the two spectral flanks of the excitation light A, specifically a first additional transmission band BA u that lies spectrally in the lower spectral flank of the excitation light A, and a second additional transmission band BA o , which lies spectrally in the upper spectral edge of the excitation light A.
  • a spectral shift of the spectral excitation band to longer wavelengths would lead to an increased intensity in the transmission band BA o of the long-wave edge and to a reduced intensity in the transmission band BA u of the short-wave edge.
  • both changes run counter to each other and at least partially balance each other out.
  • a single additional transmission band in only one of the two flanks would be less favorable since no such compensation would take place.
  • a third additional transmission band BA m can also be present in the spectral center of the excitation light.

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

Claims (15)

  1. Capteur destiné à la vérification de documents, en particulier de documents de valeur, par exemple pour la vérification de l'authenticité des documents, comprenant :
    - un équipement d'éclairage (1a, 1b) pour l'éclairage d'un document (3) avec une ou plusieurs impulsions lumineuses d'excitation d'une lumière d'excitation (A) adaptée à exciter le document en émission de lumière luminescente (L), et
    - un détecteur (6) pour la détection d'au moins une valeur de mesure de réflectance (MR) du document, et d'au moins une valeur de mesure de luminescence (ML) du document, et
    - un filtre de détection (5) se trouvant dans un couloir de rayonnement de détection (8) constitué entre le document (3) et le détecteur (6), et
    - un équipement de commande (7) pour la commande de l'équipement d'éclairage (1a, 1b) et du détecteur (6), cependant que l'équipement de commande (7) est équipé pour commander le détecteur (6) de telle façon que le détecteur (6) détecte au moins une valeur de mesure de réflectance (MR) du document à au moins un moment auquel le document est éclairé avec une impulsion lumineuse d'excitation de la lumière d'excitation (A), et détecte au moins une valeur de mesure de luminescence (ML) du document à au moins un moment après la fin de l'impulsion lumineuse respective d'excitation de la lumière d'excitation,
    - un équipement d'évaluation (9) pour la vérification du document au moyen de la au moins une valeur de mesure de réflectance (MR) détectée par le détecteur et au moyen de la au moins une valeur de mesure de luminescence (ML) détectée par le détecteur,
    caractérisé en ce que le filtre de détection (5) est un filtre spectral de détection dont la transmission spectrale est choisie de telle façon que, par le filtre spectral de détection (5), tant la lumière luminescente du document arrivant sur le filtre spectral de détection qu'au moins 0,5 % de la lumière d'excitation (A) arrivant sur le filtre spectral de détection (5) sont transmis.
  2. Capteur selon la revendication 1, caractérisé en ce que la transmission spectrale du filtre spectral de détection (5) est choisie de telle façon qu'au moins 80 % de la lumière luminescente du document arrivant sur le filtre spectral de détection sont transmis par le filtre spectral de détection (5).
  3. Capteur selon une des revendications précédentes, caractérisé en ce qu'une transmission maximale que le filtre spectral de détection (5) présente dans la zone spectrale de la lumière luminescente (L) est supérieure d'au moins un facteur 4 à une transmission maximale que le filtre spectral de détection (5) présente dans la zone spectrale de la lumière d'excitation (A).
  4. Capteur selon une des revendications précédentes, caractérisé en ce que le filtre spectral de détection (5) présente un spectre de transmission qui présente une bande spectrale de transmission de luminescence (BL) dans la zone spectrale de la lumière luminescente (L) du document et au moins une bande spectrale supplémentaire de transmission (BA) dans la zone spectrale de la lumière d'excitation (A).
  5. Capteur selon la revendication 4, caractérisé en ce que au moins une bande supplémentaire de transmission (BA) se chevauche spectralement avec la lumière d'excitation (A), en particulier se chevauche spectralement partiellement ou englobe spectralement entièrement la lumière d'excitation (A).
  6. Capteur selon la revendication 4 ou 5, caractérisé en ce que le filtre spectral de détection (5) présente dans sa bande de transmission de luminescence (BL) une transmission plus élévée que dans sa au moins une bande supplémentaire de transmission (BA).
  7. Capteur selon une des revendications de 4 à 6, caractérisé en ce que la bande supplémentaire de transmission (BA) présente par rapport à la bande de transmission de luminescence (BL) un espacement spectral s'élevant à au moins 10 nm, de préférence à au moins 20 nm.
  8. Capteur selon une des revendications de 4 à 7, caractérisé en ce que la lumière d'excitation (A) présente une bande spectrale d'excitation ayant un flanc spectral supérieur et flanc spectral inférieur, et le filtre spectral de détection (5) présente une première bande spectrale supplémentaire de transmission (Bau) située spectralement dans le flanc spectral inférieur de la bande d'excitation (A), et une deuxième bande spectrale supplémentaire de transmission (Bao) située spectralement dans le flanc spectral supérieur de la bande d'excitation (A).
  9. Capteur selon une des revendications précédentes, caractérisé en ce que l'équipement de commande (7) est équipé pour commander de telle façon le détecteur (6) ou un circuit électrique relié à ce dernier que la valeur respective de mesure de réflectance (MR) est mesurée avec une plus faible sensibilité que la valeur respective de mesure de luminescence (ML).
  10. Capteur selon la revendication 9, caractérisé en ce que l'équipement de commande (7) est équipé pour, dans le laps de temps entre la détection de la valeur respective de mesure de réflectance (MR) et de la valeur respective de mesure de luminescence (ML), commuter de telle façon un réglage de sensibilité du détecteur (6) ou d'un amplificateur relié au détecteur (6) ou d'un convertisseur courant-tension relié au détecteur que la valeur de mesure de réflectance (MR) est mesurée avec une plus faible sensibilité que la valeur de mesure de luminescence (ML).
  11. Capteur selon une des revendications précédentes, caractérisé en ce que le détecteur (6) est un détecteur à base de semi-conducteurs ayant une durée de vie de porteurs de charge n'excédant pas 20 µs.
  12. Procédé de vérification de documents, par exemple pour la vérification de l'authenticité des documents, comprenant les étapes :
    - éclairage d'un document (3) avec une ou plusieurs impulsions lumineuses d'excitation d'une lumière d'excitation (A) adaptée à exciter le document en émission de lumière luminescente (L),
    - détection d'au moins une valeur de mesure de réflectance (MR) du document à au moins un moment auquel le document est éclairé avec une impulsion lumineuse d'excitation de la lumière d'excitation (A), au moyen d'un détecteur (6),
    - détection d'au moins une valeur de mesure de luminescence (ML) du document à au moins un moment après la fin de l'impulsion lumineuse respective d'excitation, au moyen du détecteur (6),
    - vérification du document (3) au moyen de la au moins une valeur de mesure de réflectance (MR) détectée par le détecteur (6) et au moyen de la au moins une valeur de mesure de luminescence (ML) détectée par le détecteur,
    cependant que, dans un couloir de rayonnement de détection (8) constitué entre le document (3) et le détecteur (6), il y a un filtre spectral de détection (5) dont la transmission spectrale (T) est choisie de telle façon que, par le filtre spectral de détection (5), tant la lumière luminescente (L) du document arrivant sur le filtre spectral de détection (5) qu'au moins 0,5 % de la lumière d'excitation (A) arrivant sur le filtre spectral de détection (5), qui est réémise par le document, est transmise.
  13. Procédé selon la revendication 12, caractérisé en ce que le document (3) et le détecteur (6) sont transportés relativement l'un à l'autre pendant la détection, et que la valeur de mesure de réflectance et la valeur de mesure de luminescence sont détectées avec un espacement temporel si faible entre elles que les zones de détection (D1, D2) sur le document desquelles la valeur respective de mesure de réflectance (MR) et la valeur respective de mesure de luminescence sont détectées se chevauchent à au moins 50 %, de préférence à au moins 80 %
  14. Dispositif de vérification d'un document comprenant un capteur selon une des revendications de 1 à 11.
  15. Dispositif selon la revendication 14 muni d'un équipement de transport équipé pour transporter relativement l'un à l'autre le document (3) et le détecteur (6) pendant la détection de la valeur de mesure de réflectance et de la valeur de mesure de luminescence, caractérisé en ce que l'équipement de commande (7) du capteur (10) est équipé pour commander le détecteur (6) de telle façon que la valeur respective de mesure de réflectance (MR) et la valeur respective de mesure de luminescence (ML) sont détectées avec un espacement temporel si faible entre elles que les zones de détection (D1, D2) sur le document desquelles la valeur respective de mesure de réflectance (MR) et la valeur respective de mesure de luminescence sont détectées se chevauchent à au moins 50 %, de préférence à au moins 80 %.
EP19733663.9A 2018-06-20 2019-06-17 Procédé et capteur de contrôle de documents Active EP3811343B1 (fr)

Applications Claiming Priority (2)

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DE102018004884.6A DE102018004884A1 (de) 2018-06-20 2018-06-20 Verfahren und Sensor zur Prüfung von Dokumenten
PCT/EP2019/000189 WO2019242879A1 (fr) 2018-06-20 2019-06-17 Procédé et capteur de contrôle de documents

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EP3811343B1 true EP3811343B1 (fr) 2022-08-17

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CN (1) CN112334957B (fr)
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DE102016000012A1 (de) * 2016-01-05 2017-07-06 Giesecke & Devrient Gmbh Echtheitsprüfung von Wertdokumenten
DE102021006158A1 (de) 2021-12-14 2023-06-15 Giesecke+Devrient Currency Technology Gmbh Sensor und Verfahren zum Prüfen von Wertdokumenten, Sensorsystem und Wertdokumentbearbeitungsvorrichtung
DE102023101915A1 (de) 2023-01-26 2024-08-01 Giesecke+Devrient Currency Technology Gmbh Datenträger mit maschinenlesbarem Sicherheitsmerkmal, Herstellungsverfahren und Sicherheitssubstratbogen

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DE102004035494A1 (de) * 2004-07-22 2006-02-09 Giesecke & Devrient Gmbh Vorrichtung und Verfahren zur Prüfung von Wertdokumenten
US7796242B2 (en) * 2005-08-22 2010-09-14 National University Corporation Information identification device, information identification method, and information identification system
DE102008044883A1 (de) * 2008-08-29 2010-03-04 Fraunhofer-Gesellschaft zur Förderung der angewandten Forschung e.V. Verfahren zur Messung der Lumineszenzstrahlung einer Halbleiterstruktur
DE102009058805A1 (de) * 2009-12-18 2011-06-22 Giesecke & Devrient GmbH, 81677 Spektralsensor zur Prüfung von Wertdokumenten
DE102011117678A1 (de) * 2011-11-04 2013-05-08 Giesecke & Devrient Gmbh Sensor zur Prüfung von Wertdokumenten
US10650630B2 (en) 2014-10-31 2020-05-12 Honeywell International Inc. Authentication systems, authentication devices, and methods for authenticating a value article
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US20210248855A1 (en) 2021-08-12
WO2019242879A1 (fr) 2019-12-26
CN112334957A (zh) 2021-02-05
US11756362B2 (en) 2023-09-12
DE102018004884A1 (de) 2019-12-24
CN112334957B (zh) 2022-10-04

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