EP0943087A1 - Dispositif et procede pour la detection de la lumiere fluorescente et phosphorescente - Google Patents

Dispositif et procede pour la detection de la lumiere fluorescente et phosphorescente

Info

Publication number
EP0943087A1
EP0943087A1 EP97954730A EP97954730A EP0943087A1 EP 0943087 A1 EP0943087 A1 EP 0943087A1 EP 97954730 A EP97954730 A EP 97954730A EP 97954730 A EP97954730 A EP 97954730A EP 0943087 A1 EP0943087 A1 EP 0943087A1
Authority
EP
European Patent Office
Prior art keywords
light
intensity
sheet material
emitted
sensor
Prior art date
Legal status (The legal status is an assumption and is not a legal conclusion. Google has not performed a legal analysis and makes no representation as to the accuracy of the status listed.)
Granted
Application number
EP97954730A
Other languages
German (de)
English (en)
Other versions
EP0943087B1 (fr
Inventor
Nikolai Lipkowitsch
Bernd Wunderer
Heinz-Philipp Hornung
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 GmbH
Original Assignee
Giesecke and Devrient 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
Application filed by Giesecke and Devrient GmbH filed Critical Giesecke and Devrient GmbH
Publication of EP0943087A1 publication Critical patent/EP0943087A1/fr
Application granted granted Critical
Publication of EP0943087B1 publication Critical patent/EP0943087B1/fr
Anticipated expiration legal-status Critical
Expired - Lifetime 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

Definitions

  • the invention describes an apparatus and a method for the detection of fluorescent and phosphorescent emitted light of a sheet material, such as e.g. Securities or banknotes.
  • Such a device is already known from US Pat. No. 3,473,027.
  • the device described there has an illumination device which illuminates the sheet material with ultraviolet excitation light.
  • the sheet material is preferably continuously illuminated by the ultraviolet excitation light. If necessary, clocked lighting of the sheet material is also possible.
  • the light emitted by the sheet material is detected by a sensor.
  • the emitted light is imaged on a prism by means of a lens system, which then splits the emitted light into specific wavelength ranges.
  • the individual wavelength ranges are each imaged on a detector by means of a further lens system, which then emits an electrical signal proportional to the intensity of the wavelength range.
  • the sheet material is conveyed past the illumination device and the sensor by a transport system along a transport direction.
  • a disadvantage of the known device is that the light emitted by the sheet material cannot be divided into fluorescent and phosphorescent parts.
  • the invention is therefore based on the object of providing an apparatus and a method for detecting fluorescent and phosphorescent light from a sheet material, in which the light emitted by the sheet material fluorescent and a phosphorescent portion can be divided.
  • the object is achieved by the features in the characterizing part of the main claim and the subordinate claim.
  • an intensity of the emitted light is detected by the sensor during the bright phase of the clocked excitation light and a further intensity of the emitted light is detected during the dark phase of the clocked excitation light.
  • an intensity of the fluorescent light and an intensity of the phosphorescent light are derived from the intensities detected in the light phase and in the dark phase of the clocked excitation light.
  • the intensity of the phosphorescent light corresponds to the intensity of the dark phase and the intensity of the fluorescent light is derived as the difference between the intensity in the light phase and the intensity in the dark phase.
  • the light emitted by the sheet material can be broken down into a fluorescent and a phosphorescent portion.
  • the sensor preferably detects the intensities of the emitted light inside and in the transport direction towards the end of the area of the sheet material illuminated by the lighting device.
  • the area of the sheet material illuminated by the lighting device is selected to be so large that it is a multiple of the desired resolution. The result of this is that the intensity of the phosphorescent light emitted becomes relatively high, since the longest possible pre-illumination with high intensity is ensured.
  • Fig. La shows a schematic diagram of a preferred embodiment of the device according to the invention.
  • An illuminating device 20 and two sensors 30 and 40 are located in a light-tight housing 10 with a translucent window 11.
  • the window 11 transmits both the wavelength range of the excitation light and the wavelength range of the fluorescent and phosphorescent emitted light.
  • the lighting device 20 has a light-tight housing 21 with a filter 22 which does not transmit the wavelength range of the fluorescent and phosphorescent emitted light to be detected.
  • an excitation lamp 23 which is suitably clocked via a control device, not shown here.
  • the light emitted by the excitation lamp 23 contains at least the wavelength range necessary for the excitation of the fluorescent and phosphorescent emitted light.
  • a gas discharge lamp which emits at least UV light, is preferably used as the excitation lamp 23.
  • fluorescent lamps or gas discharge lamps without fluorescent can also be used as the excitation lamp 23. It is also possible to use gas discharge lamps which emit light due to a reaction of excited noble gases with halogen.
  • the sensors 30 and 40 are constructed essentially analog. You preferably have a detector array 31, 41 with which the light emitted by the sheet material is converted into an electrical signal proportional to the intensity of the emitted light. Photodiode arrays or CCD arrays, for example, can be used as detector arrays 31, 41. For example, if only one track is to be detected on the sheet material, the detector array 31, 41 can also be replaced by a single detector. The detector array 31, 41 is preferably selected such that the light emitted over the entire width of the sheet material can be detected in adjacent tracks.
  • the sensors 30, 40 each have an optical system 33, 43 which images an area of the sheet material, which is preferably smaller than the desired resolution, onto a detector of the detector array 31, 41.
  • lens systems can be used as the optical system 33, 43.
  • optical systems 33, 43 are preferably used which have at least one imaging unit made of light-conducting material.
  • the advantage of an imaging unit made of light-guiding material is that it has a significantly more compact design compared to lens systems.
  • a filter 32, 42 can be provided in the optical axis 34, 44 of a sensor 30, 40. The suitable choice of the wavelength ranges of the filters 32, 42 will be discussed in the following.
  • the optical axes 34, 44 of the sensors 30, 40 are rotated by an angle a with respect to a perpendicular to the transport direction V. Undesired reflections on the window 11 are prevented in that the translucent window 11 is at least anti-reflective for light that is incident at the angle a.
  • the sheet material 50 is transported past the lighting device 20 and the sensors 30 and 40 in a transport direction (not shown) in a transport direction indicated by an arrow and a predetermined transport speed V.
  • FIG. 1b shows the intensity of the excitation light generated by the lighting device in relative units relative to the spatial extent in the transport direction.
  • area B illuminated by the lighting device the intensity of the excitation light initially rises to a maximum and then drops again at the other end of the area.
  • the sensors 30, 40 are arranged symmetrically to the maximum of the intensity of the excitation light and detect the intensities of the emitted light within the illuminated area B. In the embodiment shown, the sensors 30 and 40 detect the intensity of the emitted light where the intensity of the Excitation light has dropped to half.
  • a cycle T is generated, the frequency of which results as a quotient of the transport speed V of the transport system and a desired local resolution A in the transport direction.
  • T V / A applies.
  • a clock frequency T 5 kHz results.
  • the bank note 50 is shown with the clock T.
  • the above definition of the clock frequency of the clock T ensures that, regardless of the transport speed V, the logical 1 or the logical 0 of the clock T is linked to a specific location of the bank note 50.
  • the desired resolution A contains one bar of the bar T.
  • the sheet material 50 is first illuminated with a clocked excitation light from the illumination device 20.
  • the light emitted by the sheet material 50 is detected by the sensor 30 within the illuminated area B in the transport direction towards the end of the illuminated area, preferably behind the maximum of the intensity of the excitation light.
  • each area of the resolution A is illuminated by the excitation light of the illumination device 20 during the transport of the sheet material 50 over several cycles of the cycle T. Since the detection of the intensity of the emitted light by the sensor 30 only in the transport direction against de of the illuminated area, preferably detected behind the maximum of the intensity of the exposure light, ensures that each area A of the sheet material 50 receives a relatively long pre-illumination with high intensity before the emitted light is detected by the sensor 30.
  • the initial intensity lo of a phosphorescent emitting substance is relatively high. Since the intensity of the light emitted by phosphorescent substances depends on the initial intensity lo and decreases exponentially with time, a high initial intensity lo is necessary for an accurate measurement.
  • the decay time ⁇ up to half the intensity and the value a are properties of the phosphorescent emitting substance.
  • the time sequences in the detection of the emitted light are shown in FIG. 2.
  • the clocks Ti to T 3 are clocks at different transport speeds V and are determined according to the above equation.
  • the light phase or the dark phase of the clocked excitation light are generated with the clock L.
  • the excitation lamp 23 is clocked with a specific, freely selectable clock L, which, however, has a higher frequency than the clock T.
  • the clock L sends a specific number of logical len to the control unit of the excitation lamp 23.
  • the aroma control lamp 23 At every logical 1 of the clock L, the aroma control lamp 23 generates a light pulse.
  • An excitation light thus arises in the bright phase, which has a certain number of light pulses which are emitted at the beginning of the cycle T.
  • the clock L supplies a logic 0 and no excitation light is emitted by the excitation lamp 23.
  • the intensity R of the emitted light is thus approximately constant during the bright phase and contains all wavelength ranges of the emitted light.
  • a filter 32 is preferably provided in the optical axis 34 of the sensor 30 and transmits only the wavelength range of the fluorescent and phosphorescent emitted light.
  • the clock D controls the point in time at which the emitted light is detected by the sensor 30.
  • This clock D contains two areas with a logical 1.
  • the first area controls the detection of the emitted light in the bright phase area and the second area controls the detection in the Dark phase area.
  • the time interval between the first area and the second area of clock D is chosen to be constant.
  • the time interval between the start of the first area of the cycle T and the start of the cycle D is also constant.
  • the time ranges of clock D and their position in the light or dark phase can be chosen as desired.
  • the position and width of the first area of the clock D is preferably selected such that the intensity of the emitted light is measured in the bright phase of a clock during the last light pulse.
  • the position of the second area of clock D is set so that the intensity of the emitted light in the dark phase is measured after a constant period of time after the last light pulse.
  • the constant time period is chosen so that the detection of the intensity of the emitted light in the dark phase is still within the shortest possible cycle T. Since the cycle T, as described above, depends on the transport speed V of the sheet material, this varies with a variation of the transport speed V. Since the method described above for detecting the intensity of the emitted light in the light or dark phase only from the start of the cycle T depends, a slowdown of the clock T, ie a slowdown of the transport speed V, can be tolerated within certain limits.
  • the detection of the emitted light in the dark phase is measured after a constant period of time after the last light pulse, the reproducibility of the intensity of the emitted light in the dark phase is also ensured in spite of the exponential drop in the intensity of the phosphorescent emitted light.
  • An intensity of the fluorescent emitted light and an intensity of the phosphorescent emitted light are derived from the intensities detected in the light phase and in the dark phase of the clocked excitation light.
  • the intensity of the phosphorescent light emitted can correspond to the intensity in the dark phase.
  • the intensity of the fluorescent light can be derived as the difference between the intensity in the light phase and the intensity in the dark phase.
  • the light emitted by the sheet material can be detected in several different wavelength ranges.
  • a filter 42 is provided in the sensor 40 in the optical axis 44, which only transmits a sub-range of the wavelength range of the fluorescent and phosphorescent emitted light. Since the sensors 30, 40 are symmetrical to the maximum intensity of the lighting device device 20 are arranged, the sensor 40 detects the intensity of the emitted light in the transport direction at the beginning of the illuminated area, preferably before the maximum of the intensity of the excitation light. It follows from this that only a negligibly small pre-illumination of the phosphorescent material has taken place when sensor 40 detects the emitted light.
  • the emitted light detected by the sensor 40 in the dark phase can therefore essentially only be undesired scattered light, so that the intensity of the light of the sensor 40 detected in the dark phase can be used, for example, for normalizing all other measured intensities.
  • the emitted light detected by the sensor 40 during the bright phase thus contains fluorescent emitted light which is restricted to a certain wavelength range by the filter 42.
  • the sensor 30 can thus derive an overall intensity of the fluorescent light emitted and the sensor 40 can derive an intensity of a specific wave range of the fluorescent light emitted.
  • an intensity of the fluorescently emitted light can also be derived in the wavelength range complementary to the wavelength range of the sensor 40.
  • sensor 30 detects the intensity of the phosphorescent light emitted.
  • the derived intensities can be assigned to a location with the desired resolution A on the bank note 50 via the clock T.
  • an intensity curve of the emitted light is broken down according to wavelength ranges.
  • the sensor 30 detects the intensity profile IF in the bright phase, which contains the entire wavelength range of the emitted light.
  • the sensor 40 detects the intensity curve I R , which here, for example, only contains the red wavelength range of the emitted light.
  • the intensity curve IG of the yellow-green emitted light is the difference between the intensity curve IF and the intensity curve IR. Furthermore, an intensity curve Ip is obtained for the light emitted in the dark phase, which is shown in FIG. 3b. As explained above, the intensities for phosphorescent light and fluorescent light in different wavelength ranges are then derived from the intensity profiles.
  • the light emitted fluorescent and phosphorescent by the entire sheet material can be detected with a desired resolution.

Landscapes

  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)
  • Luminescent Compositions (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)
EP97954730A 1996-12-09 1997-12-09 Dispositif et procede pour la detection de la lumiere fluorescente et phosphorescente Expired - Lifetime EP0943087B1 (fr)

Applications Claiming Priority (3)

Application Number Priority Date Filing Date Title
DE19651101 1996-12-09
DE19651101A DE19651101A1 (de) 1996-12-09 1996-12-09 Vorrichtung und Verfahren zur Detektion von fluoreszentem und phosphoreszentem Licht
PCT/EP1997/006879 WO1998026276A1 (fr) 1996-12-09 1997-12-09 Dispositif et procede pour la detection de la lumiere fluorescente et phosphorescente

Publications (2)

Publication Number Publication Date
EP0943087A1 true EP0943087A1 (fr) 1999-09-22
EP0943087B1 EP0943087B1 (fr) 2003-08-13

Family

ID=7814118

Family Applications (1)

Application Number Title Priority Date Filing Date
EP97954730A Expired - Lifetime EP0943087B1 (fr) 1996-12-09 1997-12-09 Dispositif et procede pour la detection de la lumiere fluorescente et phosphorescente

Country Status (10)

Country Link
US (1) US6297509B1 (fr)
EP (1) EP0943087B1 (fr)
JP (1) JP3790931B2 (fr)
CN (1) CN1096608C (fr)
AT (1) ATE247280T1 (fr)
AU (1) AU5984098A (fr)
DE (2) DE19651101A1 (fr)
RU (1) RU2170420C2 (fr)
UA (1) UA48284C2 (fr)
WO (1) WO1998026276A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2056260B1 (fr) * 2007-09-20 2019-10-30 Giesecke+Devrient Currency Technology GmbH Procédé destinés à la vérification de documents de valeur

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DE19802781A1 (de) * 1998-01-26 1999-07-29 Peter L Prof Dr Andresen Schnelle Identifizierung von wertvollen Objekten durch digitale Bildanalytik
DE19901702A1 (de) * 1999-01-18 2000-07-20 Giesecke & Devrient Gmbh Verfahren zur Überprüfung des Zustandes einer Vorrichtung zur Prüfung von Blattgut
DE19958048A1 (de) * 1999-12-03 2001-06-07 Giesecke & Devrient Gmbh Vorrichtung und Verfahren zur Echtheitsprüfung von Banknoten
FR2815751B1 (fr) * 2000-10-24 2002-12-20 Montage Cablage Electronique S Accessoire pour appareil de verification de l'authenticite de documents, par exemples des billets de banques ou des cheques
WO2003073384A1 (fr) * 2002-02-28 2003-09-04 Nidec Copal Corporation Capteur detectant la fluorescence de feuilles
US20040005769A1 (en) * 2002-07-03 2004-01-08 Cabot Microelectronics Corp. Method and apparatus for endpoint detection
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DE10344384B4 (de) * 2003-09-23 2008-07-10 Bundesdruckerei Gmbh Verfahren zur Überprüfung eines Authentifizierungsmerkmals eines rotierenden optischen Datenträgers und digitaler Datenträger
DE102004035494A1 (de) * 2004-07-22 2006-02-09 Giesecke & Devrient Gmbh Vorrichtung und Verfahren zur Prüfung von Wertdokumenten
DE102007016394A1 (de) * 2007-04-03 2008-10-09 Giesecke & Devrient Gmbh Sicherheitselement
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JP5208801B2 (ja) * 2009-02-20 2013-06-12 株式会社東芝 光検出装置、及びこの光検出装置を備える紙葉類処理装置
JP5367509B2 (ja) * 2009-08-27 2013-12-11 株式会社東芝 光検出装置、及びこの光検出装置を備える紙葉類処理装置
DE102010014912A1 (de) * 2010-04-14 2011-10-20 Giesecke & Devrient Gmbh Sensor zur Prüfung von Wertdokumenten
CN102096959B (zh) * 2010-12-08 2014-06-04 中钞长城金融设备控股有限公司 检测有价证券荧光和磷光的装置及其方法
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EP2056260B1 (fr) * 2007-09-20 2019-10-30 Giesecke+Devrient Currency Technology GmbH Procédé destinés à la vérification de documents de valeur

Also Published As

Publication number Publication date
JP3790931B2 (ja) 2006-06-28
CN1244920A (zh) 2000-02-16
EP0943087B1 (fr) 2003-08-13
AU5984098A (en) 1998-07-03
CN1096608C (zh) 2002-12-18
JP2001506001A (ja) 2001-05-08
DE59710585D1 (de) 2003-09-18
DE19651101A1 (de) 1998-06-10
UA48284C2 (uk) 2002-08-15
WO1998026276A1 (fr) 1998-06-18
ATE247280T1 (de) 2003-08-15
US6297509B1 (en) 2001-10-02
RU2170420C2 (ru) 2001-07-10

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