EP4295333A1 - Capteur pour le contrôle de la luminescence de documents de valeur - Google Patents

Capteur pour le contrôle de la luminescence de documents de valeur

Info

Publication number
EP4295333A1
EP4295333A1 EP22709947.0A EP22709947A EP4295333A1 EP 4295333 A1 EP4295333 A1 EP 4295333A1 EP 22709947 A EP22709947 A EP 22709947A EP 4295333 A1 EP4295333 A1 EP 4295333A1
Authority
EP
European Patent Office
Prior art keywords
value
luminescence
document
sensor
speed
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Pending
Application number
EP22709947.0A
Other languages
German (de)
English (en)
Inventor
Wolfgang Deckenbach
Werner Heimann
Johann Wagner
Current Assignee (The listed assignees may be inaccurate. Google has not performed a legal analysis and makes no representation or warranty as to the accuracy of the list.)
Giesecke and Devrient Currency Technology GmbH
Original Assignee
Giesecke and Devrient Currency Technology GmbH
Priority date (The priority date is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the date listed.)
Filing date
Publication date
Priority claimed from DE102021000807.3A external-priority patent/DE102021000807A1/de
Priority claimed from DE102021003334.5A external-priority patent/DE102021003334A1/de
Application filed by Giesecke and Devrient Currency Technology GmbH filed Critical Giesecke and Devrient Currency Technology GmbH
Publication of EP4295333A1 publication Critical patent/EP4295333A1/fr
Pending legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G07—CHECKING-DEVICES
    • G07D—HANDLING OF COINS OR VALUABLE PAPERS, e.g. TESTING, SORTING BY DENOMINATIONS, COUNTING, DISPENSING, CHANGING OR DEPOSITING
    • G07D7/00—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency
    • G07D7/06—Testing specially adapted to determine the identity or genuineness of valuable papers or for segregating those which are unacceptable, e.g. banknotes that are alien to a currency using wave or particle radiation
    • G07D7/12—Visible light, infrared or ultraviolet radiation
    • G07D7/121—Apparatus characterised by sensor details
    • 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
    • G07D7/20—Testing patterns thereon
    • G07D7/2075—Setting acceptance levels or parameters

Definitions

  • the invention relates to a sensor for checking the luminescence of value documents and the provision of a speed correction of a luminescence index in the sensor.
  • Sensors are usually used to check documents of value, with which the type of documents of value is determined and/or with which the documents of value are checked for authenticity or for their condition.
  • the documents of value are checked in a device for processing documents of value, in which one or more different sensors are contained, depending on the properties of the document of value to be checked. To check the documents of value, they are usually transported past the stationary sensor.
  • a document of value to be checked can have one or more luminescent substances, of which, for example, the decay time of the temporal intensity profile of the luminescence or spectral properties of the luminescence are checked.
  • the luminescent substances of the document of value can be present on or in the document of value in areas or over the entire surface.
  • To check the decay time of the luminescence it is known to illuminate documents of value with light pulses and to detect the luminescence intensity of the document of value in the dark phase between the light pulses at different times after the end of the excitation pulse.
  • the decay time of the luminescence is then determined from the time decay of the luminescence intensity and used to check the authenticity of documents of value.
  • An object of the present invention is to provide a sensor for checking documents of value, by means of which the luminescence of a document of value can be checked with improved accuracy.
  • the detected intensity profile of the luminescence is not falsified by movement effects.
  • a luminescence time constant can then be determined directly from the statically detected intensity profile as a function of time.
  • the sensor has at least one excitation light source for exciting a luminescence of the value document and at least one photodetector for detecting the luminescence of the value document excited by the excitation light source.
  • the excitation light source of the sensor is designed to illuminate an illumination area of the document of value with excitation light.
  • the luminescence excitation is achieved, for example, by an excitation pulse which the excitation light source directs onto the document of value.
  • the document of value to be checked has a security feature which contains one or more luminescent substances which emit luminescence. In response to luminescence excitation by the excitation light source, the security feature emits luminescence at one or more wavelengths.
  • the correction device is set up to calculate a correction factor based on a speed dependency of the correction factor stored in the sensor and using information about the test transport speed made available to the sensor to be determined, which applies to the test transport speed of the document of value. To determine the correction factor, the correction factor applicable to the test transport speed is sought out from the stored speed dependency of the correction factor. If a test transport speed is used for which the speed dependency of the correction factor does not explicitly indicate a correction factor, two correction factors applicable to different other transport speeds can also be offset against each other to calculate the correction factor, eg interpolated or extrapolated.
  • the sensor in particular the evaluation device, is designed to check the luminescence of the respective document of value using the corrected luminescence index.
  • the corrected luminescence index which has been subjected to the above-mentioned speed correction, can be compared with one or more reference value(s) or threshold(s) expected for the respective luminescent substance of the document of value.
  • a code derived from one or more corrected luminescence code(s) can also be used to check the respective value document using the corrected luminescence code, e.g. in the case of a speed correction for each measurement time, a characteristic time constant determined from the intensity-time curve corrected for the measurement time .
  • the luminescence parameters corrected with a speed correction according to the invention which are determined by different sensors of the same series and/or the same sensor in different installation positions, can be compared directly with one another and/or with a specified target value of the luminescence. minescence index can be compared. In the comparison with the specified target value, a narrow acceptance range around the target value can be selected—in contrast to luminescence indicators that are falsified by movement, for which a relatively large acceptance range around the target value must be allowed. This leads to a selective security document check.
  • the luminescence index of the document of value to be checked can be summed in the evaluation device of the sensor using the measured luminescence intensity(s) of the document of value to be checked and transmitted to the correction device so that it carries out the speed correction.
  • the corrected luminescence index can then be transmitted by the correction device to the evaluation device so that the latter carries out an examination of the document of value using the corrected luminescence index.
  • the correction device can be part of the evaluation device of the sensor. Alternatively, the correction device can also be present in the sensor separately from the evaluation device.
  • the reference sensor is set up to measure the luminescence of the reference medium and is assigned to the sensor in which the speed correction of the luminescence index is provided and which is to be used to check the documents of value.
  • the reference sensor assigned to the sensor belongs in particular to the same sensor series as the sensor in which the speed correction is provided.
  • the reference sensor is nominally identical (except for manufacturing tolerances) to that specific sensor in which the speed correction is provided.
  • the luminescence index of the reference medium corresponds to the luminescence index of the document of value or is identical to it.
  • the luminescence index of the reference medium is determined with the reference sensor - e.g.
  • the first speed dependency of the luminescence index applies to a first transport direction in which the reference medium is transported past the reference sensor or the document of value is transported past the sensor.
  • the second speed dependency of the luminescence index applies to the second transport direction, which is opposite to the first transport direction and in which the reference medium is transported past the reference sensor or the document of value is transported past the sensor.
  • the following steps in particular are carried out to determine the speed dependency of the correction factor: a) determining a first speed dependency L+(v) of the luminescence index corresponding to the luminescence index L of the document of value of a reference medium that can be excited to emit luminescence using the reference sensor for a first transport direction of the reference medium relative to the reference sensor, and b) determining a second Speed dependency L-(v) of the luminescence index of the reference medium corresponding to the luminescence index L of the value document using the reference sensor for a second transport direction (-x) of the reference medium opposite the first transport direction relative to the reference sensor, and c) averaging the first speed dependency L+(v) of the luminescence index of the reference medium and the second speed dependency L-(v) of the luminescence index of the reference medium at the respective speed v, by an average speed dependency Lm(v), of the luminescence index of the reference medium s to be determined, e.g.
  • the luminescence index corrected here is the same luminescence index as the luminescence index measured on the reference medium, eg a time constant or an intensity value.
  • the speed dependency of a correction factor K(v) can, for example, be calculated directly from the mean speed dependency of the luminescence parameter Lm(v) or determined using a fit curve F(v) for the mean speed dependency Lm(v).
  • a luminescence index of the reference medium is determined with the reference sensor when the ses is transported past the reference sensor along both transport directions at different transport speeds.
  • At least one luminescence intensity e.g. luminescence intensity at one or more measurement times, luminescence intensity over time or integrated luminescence intensity
  • the reference medium is measured at the respective transport speed along the respective transport direction is transported past the reference sensor
  • a single reference medium can be used here, or several reference media of the same type can be used, the measured luminescence intensities of which are averaged in order to determine the first and second speed dependency of the luminescence index of the reference medium.
  • These reference media can be specially prepared sheets provided with luminescent material or real documents of value.
  • Exactly one luminescence intensity or several luminescence intensities of the reference medium can be measured at different measurement times and/or in different spectral channels for the respective transport speed and direction.
  • the measurement time refers to the time of a pulsed luminescence excitation, e.g. at its end.
  • the determination and storage of the speed dependency of a correction factor K(v) is preferably carried out by the sensor manufacturer before the sensor is delivered. This has the advantage that the sensor provided with the speed correction can be put into operation in various value-document processing devices with little effort after delivery.
  • the speed dependency of the respective luminescence index determined solely for the first and second transport direction differs only slightly from the mean speed dependency of the respective luminescence index averaged over the two transport directions, the latter can be used for the two opposite transport directions.
  • the actual transport direction of the value documents to be checked in the respective value document processing device or the installation position of the sensor in the respective value document processing device takes for the speed correction of the respective luminescence index not to be taken into account. This makes it easier to put the sensor into operation in different installation positions or in different value-document processing devices.
  • the mean speed dependency of the respective luminescence index averaged over the two mutually opposite transport directions is essentially the same for different sensors of the same sensor series.
  • the mean speed dependency of the luminescence index applies to all sensors in the same sensor series.
  • the mean speed dependency of the luminescence index Lm(v) of the reference medium can therefore be used to determine the respective speed dependency of the correction factor K(v).
  • the average speed dependence of the respective luminescence index of one of these sensors, which is declared as the reference sensor is therefore representative for all sensors of this sensor series (which are nominally identical to the reference sensor, but de facto slightly different) for determining the speed used depending on the correction factor. It is therefore sufficient to determine the mean speed dependency of the respective luminescence index on just a single reference sensor in the sensor series, i.e. it is not necessary to determine the speed dependency of the respective luminescence index for each individual sensor in the sensor series.
  • Different measurement times are understood to mean different measurement times in relation to the pulsed luminescence excitation, eg different delay times in relation to the time of the excitation pulse of the pulsed excitation.
  • the luminescence index of the reference medium is determined using luminescence intensities that were measured by the reference sensor at different measurement times on the reference medium
  • the luminescence index of the value document is determined using luminescence intensities that are measured by the sensor at different measurement times were measured against the document of value. This is the case, for example, when the time constant, the intensity ratio or an averaged or integrated intensity is used as the luminescence index.
  • the luminescence index of the document of value to be checked is a corresponding luminescence time constant, in particular the attack or decay time, of the luminescence of the document of value to be checked, which is derived from a time profile of the luminescence intensities of the document of value measured by the sensor.
  • the luminescence index (of the reference medium or of the document of value to be checked) can also be a ratio of two of the measured luminescence intensities (of the reference medium or of the document of value to be checked), in particular the ratio of the luminescence intensities of two different measurement times or the ratio of the Luminescence intensities from two different time intervals or the ratio of the luminescence intensities measured in two different spectral channels of the reference medium or of the document of value to be checked.
  • the luminescence index of the reference medium is then a ratio of the luminescence intensities of two different measurement times of the reference sensor or the ratio of the luminescence intensities of the reference medium measured in two different spectral channels of the reference sensor.
  • the luminescence index of the document of value to be checked is the corresponding ratio of the luminescence intensities of two different measurement times of the sensor or the speaking ratio of the luminescence intensities of the value document measured in the two different spectral channels of the sensor.
  • the luminescence index (of the reference medium or of the value document to be checked) can also be obtained at a discrete measurement time (measurement time determined in relation to the time of a pulsed luminescence excitation) from the reference sensor on the reference medium or from the sensor on the value document measured luminescence intensity.
  • the luminescence index of the reference medium is then a luminescence intensity measured by the reference sensor on the reference medium at a discrete measurement time (e.g. in relation to the time of a pulsed luminescence excitation).
  • the luminescence index of the document of value to be checked is a luminescence intensity measured by the sensor on the document of value at the corresponding discrete measurement time (e.g. in relation to the time of a pulsed luminescence excitation).
  • the method can be carried out on the same reference medium and the same reference sensor as well as on the same sensor and the same document of value for several different (different with respect to the point in time of the pulsed luminescence excitation) discrete measuring points in time.
  • the luminescence intensity (by the reference sensor on the reference medium or by the sensor on the document of value) is measured for the various discrete measurement times and the luminescence index at the respective measurement time (from the reference sensor on the reference medium or from the sensor to the document of value) measured luminescence intensity used.
  • the reference sensor measures a discrete luminescence intensity on the reference medium for different discrete measurement times, and the sensor measures a discrete luminescence intensity for different discrete measurement times. intensity of the value document.
  • the corresponding discrete measurement times of the document of value can be the same as the discrete measurement times of the reference medium or at least approximately correspond to them. However, they can also be different, since the equality of the discrete measurement times is not necessary, for example for determining a time constant.
  • the luminescence intensity measured at the respective measurement time is used as the luminescence index for various discrete measurement times, with the different discrete measurement times respectively
  • the respective average speed dependency of the respective luminescence intensity of the reference medium is used to determine a measurement time-specific speed dependency of the correction factor (applicable for the respective measurement time), which is used in the sensor (according to step e)) is stored and is assigned there to the respective discrete measurement time.
  • the correction device is set up (when providing the speed correction according to step f)) for the speed correction of luminescence intensities of the respective value document, which the sensor measures at corresponding measurement times on the value document, to
  • the sensor is designed to use the corrected luminescence intensities, which were determined for the corresponding measurement times, to check the luminescence of the respective document of value.
  • several correction factors are then determined based on the information about the test transport speed, which apply to the test transport speed of the value document and to the respective measurement time, using several speed dependencies of the correction factor that are stored in the sensor and are specific to the measurement time.
  • the luminescence intensity of the value document measured at the respective measurement time is determined with the help of the test transport speed and for the respective measurement corrected by the correction factor applicable at the time, with different correction factors being used for the different measurement times.
  • the first and second speed dependency of the luminescence intensity measured at the respective discrete measurement time is determined by the reference sensor on the reference medium for the respective discrete measurement time (as the first and second speed dependency of the luminescence index of the reference medium according to steps a), b)) and
  • the respective mean Ge speed dependency of the respective luminescence intensity for the respective time discrete measurement time determined (as average speed dependency of the luminescence index of the reference medium according to step c)) and - on the basis of the average speed dependencies of the respective luminescence intensity, which were determined for the different discrete measurement times er, by averaging over the different discrete measurement times points representative speed dependency of the correction factor is determined, which applies or is used for several or all measuring times, or which applies independently of the measuring time.
  • the representative speed dependency of the luminescence intensity is used to determine the speed dependency of the correction factor (applicable to several or all measurement times) (according to step d)), which is stored in the sensor (according to step e)) (and there all discrete measurement times or several is assigned to discrete measurement times of the document of value).
  • the speed correction of the second variant is not as precise as that of the first variant, but it is less complex than the latter.
  • the average speed dependencies of the respective luminescence intensity are combined by averaging to form a representative speed dependency of the luminescence intensity, e.g luminescence intensity.
  • the first and second speed dependencies of all measurement times can be combined or averaged for this purpose.
  • the luminescence intensities of the different discrete measurement times, which were measured at the same transport speed can be combined or averaged for different transport speeds.
  • you can do this first the speed dependency of the correction factor is determined for several measurement times and these are combined or averaged.
  • the correction device is used (when providing the speed correction according to step f)) for the speed correction of luminescence intensities of the respective value document, which the sensor measures at several (any) measurement times on the value document (the discrete measurement times (t1, t2) of the reference medium may or may not comply), set up to
  • the value on the value document at the several measurement times measured luminescence intensities are corrected in particular with the aid of the same representative correction factor applicable to the test transport speed.
  • the sensor is designed, for example, to use the corrected luminescence intensities, which were determined for the measurement times, to check the luminescence of the respective document of value.
  • the sensor is set up to check the document of value using the corrected luminescence intensities that are used for the measurement times of the document of value were determined, to determine a time constant of the luminescence of the value document and to check the value document using the time constant.
  • At least two speed dependencies K(v), K'(v) of the correction factor are determined using one or more different reference media and stored in the sensor, to which different value ranges of the luminescence index, e.g. the luminescence time constant, from to are assigned to documents of value to be checked, or which apply to different value ranges of the luminescence index, eg the luminescence time constant, of documents of value to be checked.
  • the correction device is/is then set up to determine the correction factor applicable to the test transport speed as a function of information made available to the sensor about a target value of the luminescence index, eg the luminescence time constant, of the document of value to be checked.
  • the correction device is/is then set up to select that speed dependency of the correction factor from these speed dependencies as a function of information made available to the sensor about a target value of the luminescence index, e.g. the luminescence time constant, of the value document to be checked, in whose range of values lies within this target value, and to use this to determine the correction factor applicable to the test transport speed.
  • the speed dependencies applicable to different value ranges of the luminescence index e.g. the luminescence time constant, can be determined, for example, using a number of reference media whose specified luminescence index, e.g.
  • the device can have a device which is set up to determine the information about the test transport speed of the document of value and whose information about the test transport speed is transmitted to the sensor and thus made available to it.
  • This device can be the control device of the device, which has the information about the test transport speed set on the device for the documents of value.
  • the device can also be a speed sensor for measuring the test transport speed of the document of value and/or use one or more light barriers for this purpose.
  • the facility can also be the operator interface of the device, at which the test transport speed of the documents of value can be set by an operator of the device.
  • the test transport speed can also be determined by the sensor itself and made available in this way, e.g. by means of the photodetector and, if necessary, an additional photodetector of the sensor positioned at a known distance from it, which detects the time interval between one of the value document edges transported past.
  • the invention also relates to a method for checking documents of value using the sensor according to the invention, past which the documents of value are transported for checking them along a transport direction at a checking transport speed, with the steps: A) Transporting a document of value past the sensor at the test transport speed and measuring at least one luminescence intensity of the document of value by means of the sensor while being transported past,
  • Transport speed of the document of value applies, based on the speed dependency of the correction factor stored in the sensor and using the information made available to the sensor about the test transport speed,
  • an intensity-time curve of the luminescence of the document of value can be determined to check the document of value.
  • the luminescence intensity I of the document of value is measured at different measurement times TI, T2,...
  • step D) several intensity indicators In (vP), In (vP), ... the luminescence of the document of value at the test transport speed vP an- determined using the luminescence intensities of the document of value measured at the various measurement times, with the luminescence intensity measured at the respective measurement time being determined as the respective intensity index of the respective measurement time (e.g. the first luminescence index is the luminescence intensity ITI( measured at a first measurement time TI VP), the second luminescence index is the luminescence intensity IT2(VP), ... measured at a second measurement time point T2, and
  • step F the document of value is checked using the corrected luminescence indexes, i.e. using the corrected luminescence intensities In*(vP), Ix2*(vP), . . . , of the document of value.
  • the corrected luminescence intensities In*(vP), IT2*(VP), . . . a corrected luminescence time constant t e.g. decay or build-up time
  • t e.g. decay or build-up time
  • the value documents to be checked are e.g. banknotes, cheques, identity cards, credit cards, check cards, tickets, vouchers etc.
  • Fig. 1 shows an example of the schematic structure of a value document processing device 1 with an input compartment 2, in which a stack of value documents 3 to be processed is made available, and a separator 8, from which one value (e.g. the respective bottom or top) value is output one after the other document of the input stack is recorded and transferred to a transport device 10 (conveyor belts and/or transport rollers), which transports the documents of value in the transport direction +x past a sensor 25 - shown only schematically in the selected representation.
  • a transport device 10 conveyor belts and/or transport rollers
  • the sensor 25 comprises a photodetector 20 which has at least one photosensitive element which converts the luminescence intensities emitted by the document of value transported past into corresponding sensor signals.
  • the photodetector 20 can also have a number of such photosensitive elements, for example for different spectral components of the luminescence light.
  • the sensor 25 can also be used to check the documents of value 3 in one or more measurement tracks can be formed on the respective document of value, with a photodetector 20 having one or more photosensitive elements being present for each of the measurement tracks.
  • the optical excitation of the luminescence feature of the documents of value takes place, for example, by means of excitation light sources 23, 24 arranged on both sides of the photodetector 20, which illuminate the document of value with excitation light in an illumination area.
  • the Sen sor 25 is - viewed in the transport direction x of the documents of value - arranged on the left side of the transport path. Opposite the sensor 25, on the right side of the transport path, another sensor 29 can be arranged.
  • the speed dependency of the correction factor K(v) is stored in a memory area 26 of the evaluation device 22 .
  • a correction device 21 of the evaluation device 22 can access the information stored in the memory area 26 in order to use it for the speed correction of the luminescence index.
  • further information can be stored, such as information about the Test transport speed vP of the value documents, which can vary depending on the type or setting of the value document processing device 1.
  • the evaluation device 22 uses the luminescence index L*(vP) corrected by the correction device 21 as a test criterion for the documents of value, in particular for assessing the authenticity of the documents of value.
  • the switches 11 and 12 along the transport route are controlled by the control device 50 in such a way that the value document is transported into one of the output compartments 30, 31 of the value document processing device 1.
  • documents of value are stored, which were recognized as genuine, while value documents classified as fake or suspected forgery are stored in a second output compartment 31 .
  • additional output compartments and/or other facilities can be provided, for example for storing or destroying valuable documents, such as e.g. B. Cassettes for the protected storage of valuable documents or a shredder.
  • a special output compartment can be provided for it, in which documents of value of this type are deposited and made available for separate treatment, for example by an operator.
  • FIGS. 2a and 2b show the time behavior of the luminescence of a document of value, which is emitted by a luminescent security feature of the document of value.
  • the intensity profile I(t) of the luminescence then usually has a build-up of the luminescence intensity (not shown) during the excitation pulse A of the luminescence excitation and a decay of the luminescence intensity after the end of the excitation pulse of the luminescence excitation.
  • the intensity profile I(t) of the luminescence then usually has a build-up of the luminescence intensity (not shown) during the excitation pulse A of the luminescence excitation and a decay of the luminescence intensity after the end of
  • a static measurement is carried out, for example, during a manual check of individual value documents.
  • the detected luminescence intensity of the security feature decays with the specified luminescence time constant tO of the security feature.
  • the sensors 25a, 25b of the same sensor series deliver the same measurement result of the luminescence time constant tO.
  • the determination of the speed dependency K(v) of the correction factor, which applies to the respective luminescence index L, is usually carried out on the reference sensor before the sensors are delivered by the sensor manufacturer, e.g. at a suitable measuring station for the reference sensor or if this is in a Value document processing device is installed.
  • the luminescence index L of a reference medium is determined at different transport speeds v using a reference sensor that belongs to the same sensor series as those sensors in which the speed correction according to the invention is provided.
  • the reference sensor on the reference medium determines the speed dependency of that luminescence index L, based on which the sensors used to check the documents of value are to check the documents of value to be checked.
  • the reference medium is provided with a reference luminescent substance and is e.g. sheet-shaped.
  • the luminescence intensity is measured at one or more discrete measurement times, e.g. to determine the change in luminescence over time for each transport speed and direction, or measured integrated over a time interval, e.g. to determine the speed and direction for each transport speed and direction to determine the time-integrated intensity.
  • the measured luminescence intensity itself can be used as the luminescence index L of the reference medium at the respective transport speed and direction, e.g. the luminescence intensity of the reference medium measured at a discrete measurement time or integrated over a time interval.
  • the luminescence index L of the reference medium at the respective transport speed and direction can also be determined from a number of luminescence intensities measured in each case, such as the time constant from the chronological progression of the luminescence intensities or the ratio or the mean value of the points at the several discrete measurement times Value document measured luminescence intensities.
  • an average speed dependency Lm(v) of the luminescence index is determined, which is determined by averaging the first speed dependency of the luminescence index applicable to the first transport direction and that applicable to the opposite second transport direction second Ge speed dependency of the luminescence index is determined.
  • the speed dependency of the correction factor K(v) is then determined from the average speed dependency Lm(v) of the luminescence index.
  • the mean speed dependency of the luminescence index Lm(v) can be fitted using a fit curve and the speed dependency of the correction factor K(v) can be calculated from the fit curve, with the fit curve itself or the reciprocal of the fit curve being analogously multiplied by a factor offset (multiplied or divided) who can.
  • an intensity-time curve measured on a value document is corrected measuring point by measuring point and the value document is checked using the corrected intensity-time curve, e.g. by determining a time constant or a characteristic number for the intensity from the corrected intensity-time -Curve.
  • the correction factor depends either only on the speed (4th exemplary embodiment) or on the speed and the time of measurement (3rd exemplary embodiment).
  • This second type of speed correction (measurement point correction) has the advantage that more complex evaluations, e.g. of the time behavior, are possible.
  • the speed dependency K(v) of the correction factor that can be used for the integrated luminescence intensity is then determined from the mean speed dependency of the integrated luminescence intensity Im(v), which was determined using the reference sensor, and is stored in the respective sensor provided for checking the value document, see Fig 3c.
  • the mean speed dependency K(v) of the correction factor can be determined using the formula
  • the speed correction in the respective sensor is then set up in such a way that a correspondingly different correction formula (with division by the correction factor K(vP)) is used when checking the value document:
  • the average speed dependency of the correction factor K(v) can be determined from the average speed dependency Im(v) of the integrated intensity using a fit curve.
  • the test transport speed vP of the documents of value deviates more than acceptable from all transport speeds vl, v2, v3, ... stored in the sensor
  • at least two transport speeds vl, v2 are selected from the transport speeds stored in the sensor, e.g. the least of the test transport speed vP and the two correction factors K(v1), K(v2) assigned to them.
  • the correction factor K(vP) applicable to the test transport speed vP is determined from the at least two correction factors K(v1), K(v2) e.g. by interpolation.
  • the corrected integrated intensity I*(vP) is then calculated from the measured integrated intensity I(vP) of the luminescence of the document of value with K(vP) according to the above formula (1) or (2).
  • the intensity I*(vP) which has been corrected and integrated in this way is compared with a reference value, for example, and the document of value is classified as genuine or suspected of being a forgery depending on this.
  • a luminescence time constant for example the decay time or build-up time of the luminescence, is considered as the luminescence index L.
  • a reference medium is used whose reference luminescence substance has a specified luminescence time constant that matches the document of value to be checked.
  • the target value of the luminescence time constant of the document of value to be checked by the sensor deviates from the specified luminescence time constant of the reference luminescent substance of the reference medium by a maximum of 50%, preferably by a maximum of 30%, in order to achieve a speed correction that is as accurate as possible.
  • the luminescence time constant of the value documents to be checked by the sensor corresponds at least approximately to the specified luminescence time constant of the reference medium. This achieves a very precise speed correction.
  • a reference luminescent substance with a time constant of 100 ps is used for document of value luminescent substances with a time constant between 60 ps and 160 ps for the reference medium, and a reference luminescent substance with a time constant of between 160 ps and 350 ps for document of value luminescent substances with a time constant of 250 ps, and for value document luminescent substances with a time constant between 350 ps and 5 ms a reference luminescent substance with a time constant of 900 ps is used.
  • a reference luminescent substance with a time constant of 250 ps can also be used for value document luminescent substances with a time constant between 100 ps and 5 ms.
  • a reference medium which has the same luminescent substance as the value documents to be checked with the respective sensor, ie the reference luminescent substance and the value document luminescent substance are the same.
  • a first luminescence time constant t+(vl), t+(v2), t+(v3) of the reference medium is measured with the reference sensor at the different transport speeds vl, v2, v3 along the first transport direction (+x) and a second luminescence time constant t-(v1), t-(v2), t-(v3) of the reference medium was measured along the opposite, second transport direction ( ⁇ x), see FIG. 4a.
  • FIG. 4a shows the speed dependencies t+(v), t-(v) of the luminescence time constant t of the reference medium for the two transport directions (+x, -x) and the mean speed dependency tm(v) of the luminescence determined therefrom - Time constant shown.
  • the luminescence time constants measured by the value-document sensor differ somewhat from the luminescence time constants measured by the reference sensor due to the manufacturing-related tolerances.
  • the mean speed dependencies of the luminescence time constant of the reference sensor tm(v) and of the value document sensor t'm(v) averaged over the two transport directions are essentially identical (solid curves in FIGS. 4a and 4b).
  • the average speed dependence of the luminescence time constant tm(v), which was determined using the reference sensor, is therefore used as a representative value for the value document sensors that are nominally identical in construction.
  • the speed dependency K(v) of the correction factor that can be used for the luminescence time constant is then determined and stored in the respective sensor provided for value document testing., see figure 4c.
  • the sensor uses the information about the check transport speed vP to look for the correction factor K(vP) from the speed dependency of the correction factor K(v), which is assigned to the check transport speed of the value document vP, see Fig. 4c. If the speed dependency of the correction factor K(v) is only stored in the sensor in the form of discrete values K(vl), K(v2), ..., the correction factor K(vP) applicable to the test transport speed vP of the value document can can also be calculated from these discrete values K(v1), K(v2), ... by interpolating or extrapolating.
  • the luminescence time constant t*(vP) corrected in this way is compared with a reference value, for example, and the document of value is classified as genuine or as a suspected counterfeit depending on this.
  • At least one further mean speed dependency of the time constant t # m(v) can be determined, which applies to documents of value with a different target value of the luminescence time constant. Based on this - in addition to the speed dependency of the correction factor K(v) indicated above - one or more other speed dependencies K # (v) of the correction factor can also be determined and stored in the sensor, each for a different value range of the luminescence time constant of the value documents to be checked apply.
  • the respective speed dependency of the correction factor K(v), K # (v) is then used for speed correction, which applies to the luminescence time constant of the respective value document to be checked, ie depending on the luminescence time constant expected for the document of value corrects the measured luminescence time constant either with K(vP) or with K # (vP).
  • the intensity-time curve is corrected for each measuring point.
  • a separate speed dependency of the correction factor is stored in the sensor, e.g. the speed dependency of the correction factor K ti (v) for the measurement time tl, the speed dependency of the correction factor K t 2(v) for the measurement time t2 , ....
  • FIG. 5a A second luminescence intensity I ti -(vl), I ti -(v2), I ti -(v3) des Reference medium for the first measurement time tl and another second luminescence intensity I t 2- (vl), I t2 -(v2) I t2 -(v3) of the reference medium for the second measurement time t2 ge (and the same if necessary also for further measurement times t3 , t4, ... and/or further transport speeds v4, v5, ...), cf. Fig. 5a.
  • 5a shows the speed dependencies I ti +(v), I ti -(v), I t 2+(v), I t 2-(v) of the respectively measured luminescence intensity of the reference medium for the two transport directions ( +x, -x) and for the two measurement times tl, t2 and the mean speed dependence I ti m(v) and I t 2m(v) of the luminescence intensity determined therefrom for the two measurement times tl, t2 of the intensity-time -Curve shown.
  • the speed dependency of the correction factor can also be stored in the form of mathematical functions K ti (v), K t 2 (v), ... as a function of the transport speed v for different measurement times tl, t2, ... or in the form of mathematical functions K vi (t), K V 2(t), ... as a function of the measurement time t for different transport speeds vl, v2, ..., which are determined, for example, by means of a fit function.
  • the document of value sensor When checking documents of value, the document of value sensor detects the luminescence intensity of the document of value, for example, at such measurement times TI, T2 after the end of the luminescence excitation, which correspond to the discrete measurement times tl, t2 of the reference sensor when measuring the reference medium, for which there is a speed dependency of the correction factor K ti (v), K t 2(v) is stored in the sensor.
  • the corresponding speed dependencies of the correction factor Kn(v), K T 2(V) can be calculated from the stored K ti (v), K t 2(v) extrapolated or interpolated and, if necessary, stored in the sensor.
  • the luminescence of the document of value can then be checked on the basis of the corrected luminescence intensities In*(vP), It 2* (nR).
  • the corrected luminescence intensities In*(vP), IT2*(VP) ZB can be set in relation to one another and compared with a reference value, and the document of value can be classified as genuine or suspected of being a fake depending on this.
  • the representative speed dependency KR(V) of the correction factor is then stored in the sensor and the sensor is set up in such a way that the representative speed dependency KR(V) is used in the speed correction for all discrete measurement times T1, T2 of the document of value.
  • K R (v) (K ti (v), +K t2 (v))/2.
  • the respective document of value can be checked on the basis of the luminescence intensities ITI*(VP), Ii2*(vP) corrected in this way in a manner analogous to the third exemplary embodiment.

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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)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

L'invention concerne un capteur pour le contrôle de documents de valeur, qui est conçu pour déterminer un indice de luminescence d'un document de valeur passant devant le capteur de contrôle, et la fourniture d'une correction de l'indice de luminescence du document de valeur en fonction de la vitesse dans ledit capteur. Le mouvement relatif entre le document de valeur et le capteur permet d'obtenir, en raison d'effets de mouvement, une altération des intensités de luminescence mesurées. Une dépendance vis-à-vis de la vitesse moyenne de l'indice de luminescence d'un milieu de référence est déterminée à l'aide d'un capteur de référence, la moyenne étant obtenue par l'intermédiaire des deux directions de transport mutuellement opposées, et est utilisée pour déterminer une dépendance vis-à-vis de la vitesse d'un facteur de correction pour l'indice de luminescence. Le facteur de correction de l'indice de luminescence, qui est valable pour la vitesse de transport aux fins de contrôle du document de valeur, est déterminé sur la base de celle-ci, ce qui permet de corriger ensuite l'indice de luminescence.
EP22709947.0A 2021-02-16 2022-02-15 Capteur pour le contrôle de la luminescence de documents de valeur Pending EP4295333A1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE102021000807.3A DE102021000807A1 (de) 2021-02-16 2021-02-16 Sensor zur Prüfung von Wertdokumenten
DE102021003334.5A DE102021003334A1 (de) 2021-06-29 2021-06-29 Sensor zur Prüfung der Lumineszenz von Wertdokumenten
PCT/EP2022/025050 WO2022174979A1 (fr) 2021-02-16 2022-02-15 Capteur pour le contrôle de la luminescence de documents de valeur

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EP4295333A1 true EP4295333A1 (fr) 2023-12-27

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EP (1) EP4295333A1 (fr)
WO (1) WO2022174979A1 (fr)

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* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102010014912A1 (de) * 2010-04-14 2011-10-20 Giesecke & Devrient Gmbh Sensor zur Prüfung von Wertdokumenten
WO2018181134A1 (fr) * 2017-03-27 2018-10-04 グローリー株式会社 Capteur optique, dispositif de détection de lumière, dispositif de traitement de feuille de papier, procédé de détection de lumière et dispositif de détection de phosphorescence
JP7262952B2 (ja) * 2018-09-19 2023-04-24 株式会社東芝 紙葉類処理装置および紙葉類処理方法
EP3754619A3 (fr) * 2019-05-30 2021-04-21 Kabushiki Kaisha Toshiba Dispositif de traitement de feuille de papier, procédé de traitement de feuilles de papier et procédé de correction d'image fluorescente

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