EP0943087B1 - Vorrichtung und verfahren zur detektion von fluoreszentem und phosphoreszentem licht - Google Patents

Vorrichtung und verfahren zur detektion von fluoreszentem und phosphoreszentem licht Download PDF

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Publication number
EP0943087B1
EP0943087B1 EP97954730A EP97954730A EP0943087B1 EP 0943087 B1 EP0943087 B1 EP 0943087B1 EP 97954730 A EP97954730 A EP 97954730A EP 97954730 A EP97954730 A EP 97954730A EP 0943087 B1 EP0943087 B1 EP 0943087B1
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EP
European Patent Office
Prior art keywords
light
intensity
sheet material
emitted
emitted light
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.)
Expired - Lifetime
Application number
EP97954730A
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German (de)
English (en)
French (fr)
Other versions
EP0943087A1 (de
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/de
Application granted granted Critical
Publication of EP0943087B1 publication Critical patent/EP0943087B1/de
Anticipated expiration legal-status Critical
Expired - Lifetime legal-status Critical Current

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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

Definitions

  • the invention describes an apparatus and a method for detection of fluorescent and phosphorescent light emitted from a sheet, such as e.g. Securities or banknotes.
  • Such a device is already known from US Pat. No. 3,473,027. These Device described has a lighting device that the Sheet material illuminated with ultraviolet excitation light. This is preferred Sheet material continuously illuminated by the ultraviolet excitation light. If required, clocked lighting of the sheet material is also possible.
  • the Light emitted by the sheet material is detected by means of a sensor. For this the emitted light is imaged on a prism by means of a lens system, which then breaks down the emitted light into certain wavelength ranges. The individual wavelength ranges are determined using a further lens system each mapped onto a detector, which is then an electrical one Output signal proportional to the intensity of the wavelength range.
  • a disadvantage of this known device is that the sheet material emitted light is not divided into fluorescent and phosphorescent parts can be.
  • a device and a method for detecting fluorescent and phosphorescent light emitted by an identification tag on a package is known from US-PS 3,592,326.
  • an optical scanner including lighting device described, in which the on conveyor belts transported packets by focused on a scan line Lamps are illuminated clocked during the transport movement.
  • the light emitted by the package or the identification mark is transmitted via a rotating mirror arrangement, whose axis of rotation parallel to the direction of transport runs and which is exactly above the said scan line one of two sensors via two prisms and assigned filters fed.
  • a rotating mirror arrangement whose axis of rotation parallel to the direction of transport runs and which is exactly above the said scan line
  • one of two sensors via two prisms and assigned filters fed.
  • the known device has a complex structure and also requires at least two sensors, what with a corresponding one Adjustment, calibration and maintenance requirements are connected.
  • the illumination and scanning aligned to the scan line is the excitation the phosphorescent identification tag only slightly, so that only a small amount for the detection of the phosphorescent emitted light Intensity is available, which enables precise, reproducible measurement is not ensured.
  • the invention is therefore based on the object of measuring very precisely Device and a method for the detection of fluorescent and phosphorescent To create light from a sheet, in which the sheet emitted light also with a common sensor in a fluorescent and a phosphorescent portion can be divided.
  • a sensor during the bright phase of the clocked Excitation light an intensity of the emitted light and during the Dark phase of the clocked excitation light a further intensity of emitted light detected.
  • the in the bright phase and in the dark phase of the clocked excitation light Intensities an intensity of the fluorescent light emitted and derived an intensity of the phosphorescent emitted light.
  • the intensity of the phosphorescent light emitted the intensity of the Dark phase and the intensity of the fluorescent emitted light is considered Difference of the intensity in the light phase and the intensity in the dark phase derived.
  • the sensor also detects the intensities of the emitted Light inside and in the direction of transport towards the end of the Illumination device illuminated area of the sheet material. additionally becomes the area of the sheet material illuminated by the lighting device chosen so large that it is a multiple of the desired resolution.
  • FIG. 1a shows a schematic diagram of a preferred embodiment of the invention Contraption.
  • a light-tight housing 10 with a there is a lighting device 20 in the translucent window 11 and two sensors 30 and 40.
  • the window 11 transmits both the Wavelength range of the excitation light as well as the wavelength range of the fluorescent and phosphorescent light emitted.
  • the lighting device 20 has a light-tight housing 21 with a Filter 22 on which the wavelength range of the fluorescent to be detected and phosphorescent emitted light is not transmitted.
  • a Filter 22 on which the wavelength range of the fluorescent to be detected and phosphorescent emitted light is not transmitted.
  • Control device is clocked appropriately. That from the excitation lamp 23 emitted light contains at least that for the excitation of the fluorescent and phosphorescent emitted light necessary wavelength range.
  • a gas discharge lamp is preferably used as the excitation lamp 23. which at least emits UV light.
  • the excitation lamp 23 also fluorescent lamps or gas discharge lamps without fluorescent be used.
  • the use of gas discharge lamps possible the light due to a reaction of excited noble gases emit with halogen.
  • the sensors 30 and 40 are constructed essentially analog.
  • Prefers have a detector array 31, 41 with which the material emitted by the sheet material Light in an electrical signal proportional to the intensity of the emitted Light is converted.
  • a detector array 31, 41 Photo diode arrays or CCD arrays can be used.
  • the detector array can detect only one track on the sheet material 31, 41 can also be replaced by a single detector. Is preferred the detector array 31, 41 is selected so that that over the entire width of the Sheet light emitted light can be detected in adjacent tracks can.
  • the sensors 30, 40 each have an optical system 33, 43, the one area of the sheet material, which is preferably smaller than the desired Resolution, images on a detector of the detector array 31, 41.
  • an optical System 33, 43 for example, lens systems can be used.
  • optical systems 33, 43 are preferably used, which at least have an imaging unit made of light-conducting material. The advantage of an imaging unit made of light-conducting material is that that they are much more compact compared to lens systems is.
  • a filter can be in the optical axis 34, 44 of a sensor 30, 40 32, 42 are provided. On the appropriate choice of the wavelength ranges the filter 32, 42 will be discussed below.
  • the optical axes 34, 44 of the sensors 30, 40 with respect to an angle ⁇ a perpendicular to the transport direction V rotated. Unwanted reflections at the window 11 are prevented by the translucent Anti-glare window 11 at least for light that is incident at the angle ⁇ is.
  • the sheet material 50 is brought to a transport system, not shown here the lighting device 20 and the sensors 30 and 40 in one with an arrow marked transport direction and a predetermined one Transport speed V transported past.
  • 1b shows the intensity of the generated by the lighting device Excitation light in relative units compared to the spatial extent in the direction of transport.
  • Area B initially increases the intensity of the excitation light peaks and then drops again at the other end of the range.
  • the sensors 30, 40 are symmetrical to the maximum of the intensity of the excitation light arranged and detect the intensities of the emitted Light within the illuminated area B. In the illustrated embodiment sensors 30 and 40 detect the intensity of the emitted Light where the intensity of the excitation light has dropped to half is.
  • a Clock T generates whose frequency is the quotient of the transport speed V of the transport system and a desired local resolution A results in the direction of transport.
  • T V / A applies.
  • the bank note 50 is shown with the clock T.
  • the above definition of the clock frequency of the clock T ensures that it is independent of the transport speed V in each case the logical 1 or the logical 0 of the clock T linked to a specific location of the banknote 50 is.
  • the desired resolution A contains one bar of the bar T.
  • the sheet material 50 To detect the fluorescent and phosphorescent light emitted by the Sheet material 50, this is first of all with a clocked excitation light Illumination device 20 illuminated.
  • the light emitted by the sheet material 50 is from the sensor 30 within the illuminated area B in the transport direction towards the end of the illuminated area, preferably behind the maximum the intensity of the excitation light is detected.
  • each area of resolution A during the transportation of the Sheet material 50 over several cycles of the cycle T from the excitation light of the lighting device 20 illuminated. Since the detection of the intensity of the emitted light by the sensor 30 only in the transport direction towards the end of the illuminated area, preferably behind the maximum of the intensity the excitation light is detected, it is ensured that each area A the sheet material 50 receives a relatively long pre-illumination with high intensity, before the emitted light is detected by sensor 30.
  • a long pre-lighting with high intensity leads to the fact that the initial intensity I 0 of a phosphorescent emitting substance is relatively high. Since the intensity of the emitted light from phosphorescent substances depends on the initial intensity I 0 and decreases exponentially with time, a high initial intensity I 0 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 cut light are shown in FIG. 2.
  • the clocks T 1 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 logic lines to the control unit of the excitation lamp 23.
  • the excitation lamp 23 At every logic 1 of the clock L, the excitation lamp 23 generates a light pulse.
  • the intensity R of the emitted light is thus approximately during the bright phase constant and contains all wavelength ranges of the emitted Light.
  • a filter is preferred in the optical axis 34 of the sensor 30 32 provided that only the wavelength range of the fluorescent and transmitted phosphorescent light.
  • the clock D controls the time of detection of the emitted light the sensor 30.
  • This clock D contains two areas with a logical 1. The only the area controls the detection of the emitted light in the area of the bright phase and the second area controls the detection in the dark phase area.
  • the time interval between the first area and the second The range of clock D is chosen to be constant.
  • the time interval of the The beginning of the first area of the clock T at the beginning of the clock D is constant.
  • the time ranges of clock D and their position in the bright or dark phase can in principle be chosen arbitrarily. Prefers however, the position and width of the first area of the clock D is chosen so that the intensity of the emitted light in the bright phase of a clock is measured during the last light pulse.
  • the location of the second area the clock D is placed so that the intensity of the emitted light in the dark phase after a constant period after the last one Light pulse is measured.
  • the constant time period is chosen so that the detection of the intensity of the emitted light in the dark phase takes place within the shortest possible cycle T.
  • the clock T since the clock T, as described above, from the transport speed V depends on 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 Depends on the beginning of the clock T, a slowdown of the clock T, i.e. a slowing down of the transport speed V, within certain limits be tolerated. Because the detection of the emitted light in the dark phase measured after a constant period of time after the last light pulse is, the reproducibility of the intensity of the emitted light is also in the dark phase despite the exponential drop in the intensity of the phosphorescent emitted light guaranteed.
  • Detected intensities are fluorescence intensities emitted light and an intensity of the phosphorescent emitted Light derived.
  • the intensity of the phosphorescent emitted light correspond to the intensity in the dark phase.
  • the intensity of the fluorescent light emitted can be the difference of the Intensity in the light phase and intensity in the dark phase are derived become.
  • the second sensor 40 that emitted by the sheet material can be Light can be detected in several different wavelength ranges.
  • a filter 42 is provided in the sensor 40 in the optical axis 44. which is only a sub-range of the wavelength range of the fluorescent and emitted phosphorescent light. Because the sensors 30, 40 symmetrical to the maximum of the intensity of the lighting 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, preferred before the maximum of the intensity of the excitation light. From this follows that only a negligibly small pre-illumination of the phosphorescent Substance in the detection of the emitted light by the sensor 40 has taken place.
  • That detected by the sensor 40 in the dark phase emitted light can essentially only unwanted stray light be so that the intensity of the light detected in the dark phase of sensor 40, for example for normalizing all other measured Intensities can be used. That from sensor 40 during the light phase Detected emitted light thus contains fluorescent light that restricted to a certain wavelength range by the filter 42 becomes.
  • the senor can 30 an overall intensity of the fluorescent light emitted and from the sensor 40 an intensity of a specific waveband of the fluorescent emitted Derive light.
  • the difference between the detected Total intensity of the sensor 30 and the detected intensity of the sensor 40 can also be an intensity of the fluorescent light emitted in the to the wavelength range of the sensor 40 complementary wavelength range derived.
  • the sensor 30 detects the intensity of the phosphorescent emitted light.
  • the derived ones can be derived from clock T Intensities a place with the desired resolution A on the banknote 50 assign.
  • an intensity curve of the emitted light is broken down according to wavelength ranges.
  • the intensity profile I F is detected by the sensor 30 in the light 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 I G of the yellow-green emitted light is the difference between the intensity curve I F and the intensity curve I R.
  • an intensity curve I P is obtained for the light emitted in the dark phase, which is shown in FIG. 3b.
  • the intensities for phosphorescent light and fluorescent light in different wavelength ranges are then derived from the intensity profiles.

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  • 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 Vorrichtung und verfahren zur detektion von fluoreszentem und phosphoreszentem licht Expired - Lifetime EP0943087B1 (de)

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 (de) 1996-12-09 1997-12-09 Vorrichtung und verfahren zur detektion von fluoreszentem und phosphoreszentem licht

Publications (2)

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

Family

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EP97954730A Expired - Lifetime EP0943087B1 (de) 1996-12-09 1997-12-09 Vorrichtung und verfahren zur detektion von fluoreszentem und phosphoreszentem licht

Country Status (10)

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

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2754137B1 (de) 2011-09-06 2016-11-02 Bundesdruckerei GmbH Vorrichtung zum mobilen erkennen eines dokumentes
EP3147873B1 (en) 2014-05-22 2022-09-28 Glory Ltd. Fluorescence/phosphorescence detection device

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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
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US20040005769A1 (en) * 2002-07-03 2004-01-08 Cabot Microelectronics Corp. Method and apparatus for endpoint detection
JP4188653B2 (ja) * 2002-10-01 2008-11-26 浜松ホトニクス株式会社 蛍光測定装置
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
DE102007044878A1 (de) * 2007-09-20 2009-04-09 Giesecke & Devrient Gmbh Verfahren und Vorrichtung zur Prüfung von Wertdokumenten
GB0814909D0 (en) * 2008-08-14 2008-09-24 Rue De Int Ltd Phosphorescence detector
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
GB2492950A (en) * 2011-07-11 2013-01-23 Cambridge Consultants Measuring a luminescent property of a sample using a dual-modulated excitation beam
WO2014097489A1 (ja) * 2012-12-21 2014-06-26 グローリー株式会社 スペクトルセンサ
WO2014132415A1 (ja) * 2013-02-28 2014-09-04 グローリー株式会社 蛍光・燐光検知方法及び装置並びに有価媒体の真偽判定方法及び装置
WO2018181134A1 (ja) 2017-03-27 2018-10-04 グローリー株式会社 光センサ、光検出装置、紙葉類処理装置、光検出方法及び燐光検出装置
JP7111494B2 (ja) 2018-04-05 2022-08-02 グローリー株式会社 光検出センサ、光検出装置、シート類処理装置および光検出方法

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Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2754137B1 (de) 2011-09-06 2016-11-02 Bundesdruckerei GmbH Vorrichtung zum mobilen erkennen eines dokumentes
EP3147873B1 (en) 2014-05-22 2022-09-28 Glory Ltd. Fluorescence/phosphorescence detection device

Also Published As

Publication number Publication date
JP2001506001A (ja) 2001-05-08
DE19651101A1 (de) 1998-06-10
WO1998026276A1 (de) 1998-06-18
UA48284C2 (uk) 2002-08-15
JP3790931B2 (ja) 2006-06-28
CN1244920A (zh) 2000-02-16
ATE247280T1 (de) 2003-08-15
DE59710585D1 (de) 2003-09-18
CN1096608C (zh) 2002-12-18
RU2170420C2 (ru) 2001-07-10
AU5984098A (en) 1998-07-03
EP0943087A1 (de) 1999-09-22
US6297509B1 (en) 2001-10-02

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