WO2004001684A1 - Identification d'objets etrangers sur ou dans des billets de banque - Google Patents

Identification d'objets etrangers sur ou dans des billets de banque Download PDF

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Publication number
WO2004001684A1
WO2004001684A1 PCT/EP2003/006325 EP0306325W WO2004001684A1 WO 2004001684 A1 WO2004001684 A1 WO 2004001684A1 EP 0306325 W EP0306325 W EP 0306325W WO 2004001684 A1 WO2004001684 A1 WO 2004001684A1
Authority
WO
WIPO (PCT)
Prior art keywords
radiation
banknote
microns
foreign objects
detector
Prior art date
Application number
PCT/EP2003/006325
Other languages
German (de)
English (en)
Inventor
Jürgen Schützmann
Jan Domke
Original Assignee
Giesecke & 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 & Devrient Gmbh filed Critical Giesecke & Devrient Gmbh
Priority to AU2003246439A priority Critical patent/AU2003246439A1/en
Publication of WO2004001684A1 publication Critical patent/WO2004001684A1/fr

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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
    • G07D7/181—Testing mechanical properties or condition, e.g. wear or tear
    • 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
    • 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
    • G07D7/181—Testing mechanical properties or condition, e.g. wear or tear
    • G07D7/189—Detecting attached objects, e.g. tapes or clips

Definitions

  • the invention relates to a method and a corresponding device for recognizing foreign objects, in particular adhesive strips, on or in banknotes according to the preamble of claims 1 and 8.
  • banknotes When machine processing banknotes in commercial or central banks, the banknotes are checked, among other things, with regard to their suitability for further use in payment transactions.
  • An important decision criterion here is the presence of undesired foreign objects on or in the banknotes.
  • Such undesired objects are generally objects which are not part of a finished banknote and only appear on or into the banknote during circulation. or be introduced. Frequently, these are adhesive strips or similar adhesive objects that are glued to the banknote in particular for repair purposes.
  • Such banknotes are generally considered to be no longer suitable for further use and must be recognized, sorted out and, if necessary, destroyed during machine processing.
  • the backing layer is made of plastics, e.g. Polypropylene (PP), polyvinyl chloride (PVC), polyethylene terephthalate (PET), polyethylene (PE) or cellulose acetate.
  • the adhesive layer usually contains acrylate, modified acrylate or rubber.
  • the bank notes to be examined are subjected to ultrasound and the thickness of the bank note is calculated from the sound component reflected or transmitted by the bank note.
  • These methods are also only suitable to a limited extent for the detection of adhesive strips on banknotes, since the commercially used adhesive films which are frequently used have a very small thickness in relation to the paper thickness of the banknote.
  • the differences in the reflected or transmitted sound in areas with and without adhesive strips are correspondingly small, so that in particular thin adhesive strips cannot be detected with sufficient reliability.
  • the invention is based on the idea of adhesive strips on banknotes by measuring the reflected from the banknote and / or by Banknote transmitted middle infrared radiation (MIR radiation) with wavelengths between 2.5 ⁇ m and 25 ⁇ m.
  • MIR radiation Banknote transmitted middle infrared radiation
  • adhesive strips can be detected with high reliability, since differences between individual areas of the bank note with and without adhesive strips clearly emerge in this spectral range. This means that even very thin adhesive strips with typical thicknesses between 15 ⁇ m and 50 ⁇ m can be recognized with high reliability.
  • the wavelength of the radiation used is preferably between 3 ⁇ m and 12 ⁇ m in order to be able to detect the different transmission or reflection behavior of the banknote in regions with and without adhesive strips even more reliably. Particularly large differences can be detected at wavelengths between 5.5 ⁇ m and 6 ⁇ m, preferably between 5.7 ⁇ m and 5.8 ⁇ m.
  • Fig. 1 shows an embodiment of the device according to the invention
  • Fig. 2 shows the transmission behavior of a banknote at locations with and without adhesive strips.
  • Fig. 1 shows an embodiment of the device according to the invention.
  • a bank note 1 is conveyed through a suitable transport device (not shown) in the transport direction 20 to an irradiation device 6.
  • the irradiation device 6 sends electromagnetic radiation lung 2, which meets the bank note 1 in the area of point 21.
  • a detector 4 arranged opposite the radiation device 6 detects the radiation 3 transmitted through the bank note 1 and generates a signal 15 corresponding to the radiation 3 detected in each case, which signal 15 is forwarded to an evaluation device 5.
  • the wavelengths of the radiation 2 or 3 emitted by the irradiation device 6 and / or of the detector 4 are in the mid-infrared (MIR), i.e. between 2.5 ⁇ m and 25 ⁇ m.
  • MIR mid-infrared
  • differences in the transmission behavior between the individual areas of the bank note 1 with and without adhesive strips 10 are clearly evident.
  • the differences in the transmission behavior at wavelengths of radiation 2 or 3 between 3 ⁇ m and 12 ⁇ m are particularly clear. Even greater differences can be detected at wavelengths between 5.5 ⁇ m and 6 ⁇ m, preferably between 5.7 ⁇ m and 5.8 ⁇ m.
  • the corresponding signals 15 of the MIR radiation 3 detected at different points 21 of the bank note 1 are recorded in the evaluation device 5. compared to each other. Statements about the presence of foreign objects, in particular adhesive strips 10, on the banknote 1 are derived from the comparison. The ratio or difference of signals 15 detected at different points 21 of the bank note 1 is preferably formed, which signals 15 are then used to identify adhesive strips.
  • the irradiation device 6 comprises a radiation source 7, which emits thermal radiation 8 in the MIR.
  • a Nernst pin or a Globar pin is preferably used as the radiation source 7.
  • a Nernst pencil is a rod a few centimeters long and a few millimeters thick made of zirconium oxide with additions of yttrium oxide and oxides of other rare earths.
  • the normal operating temperature is around 1900 K. Because of this high operating temperature and the corresponding spectral energy distribution, the Nernst pen is particularly suitable as a radiation source in the mid-infrared.
  • a Globar pin is a silicon carbide rod with typical diameters of about 6 to 8 mm.
  • the operating temperature is around 1500 K, which results in a lower radiation intensity in the radiation maximum.
  • ceramic light sources heated with a metallic conductor can also be used as radiation source 7.
  • a heating wire made of platinum or a platinum alloy is wound around a ceramic rod. This wire helix is covered with a sintered layer of aluminum oxide, thorium oxide, zirconium silicate or a similar material. surrounding material. Coils made of chrome-nickel or tungsten wire are particularly suitable for the short-wave spectral range.
  • the radiation source 7 is preferably surrounded by a casing 9 with an opening 12.
  • the sheath 9 shields the radiation 8 emitted by the radiation source 7, as a result of which undesired heating of an excessively large area on the bank note 1 but also from neighboring other devices is prevented. Only the radiation 2 provided for irradiation of a specific area of the bank note 1 can emerge from the casing 9 through the opening 12.
  • an aperture 11 is also provided in the area of the opening 12, which is provided for further spatial limitation of the radiation 2 striking the bank note 1.
  • the diaphragm 11 is preferably slit-shaped, as a result of which a rectangular area on the bank note 1 is irradiated.
  • a filter 13, e.g. an interference filter is provided.
  • the filter 13 is only permeable in a narrow spectral range, preferably between 5.5 ⁇ m and 6 ⁇ m, in particular between 5.7 ⁇ m and 5.8 ⁇ m, so that only the spectral component relevant for the measurement - and thus a comparatively small one spectral portion of the thermal radiation 8 emitted by the radiation source 7 - on the
  • Banknote 1 hits. This prevents undesired heating of the bank note 1 by spectral components that are not required for the measurement. This is particularly advantageous in cases in which banknotes are prolonged due to banknote jams or a stoppage of the banknote transport Exposed to radiation for a long time, since here a relatively broadband thermal radiation would lead to strong heating and thus to damage or even destruction of the banknote.
  • a cooling device (not shown) for cooling the radiation device can preferably be provided in the area of the casing 9.
  • the detector 4 is preferably designed as a line detector with a plurality of detector elements, so-called pixels, arranged in a row.
  • the detector line runs perpendicular to the plane of the drawing and thus perpendicular to the transport direction 20 and extends over the entire width of the banknote 1.
  • the detector 4 can also be designed as a two-dimensional area detector, preferably in the size of the area of the bank note 1. In this case, the entire area of the bank note 1 is irradiated and the radiation passing through the bank note 1 is detected by the area detector. In this way, a very rapid detection of the radiation transmitted in the MIR is achieved over the entire bank note 1.
  • the captured image can be evaluated in the evaluation device 5 to derive statements about any adhesive strips 10 that are present.
  • Thermal detectors or quantum detectors are used as detectors 4 or detector elements.
  • Thermal detectors have a sensitivity that is independent of the wavelength.
  • Bolometers which measure the change in resistance due to heating, or pyroelectric detectors, which consist of a radiation-sensitive capacitor, such as e.g. DTGS (deuterated triglycine sulfate doped with alanine), or sintered ceramics, e.g. PZT (lead zirconate titanate).
  • DTGS deuterated triglycine sulfate doped with alanine
  • sintered ceramics e.g. PZT (lead zirconate titanate).
  • Quantum detectors are very fast and sensitive, which makes them particularly suitable for applications of the invention in banknote checking systems with high transport speeds.
  • the sensitivity of quantum detectors depends on the wavelength.
  • the working principle is based on the external photoelectric effect.
  • Quantum detectors based on CdHgTe ('MCT detector 1 , Mercury Cadmium Telluride) are preferably used, since they have a very high response speed and sensitivity.
  • the radiation 3 transmitted by the bank note 1 is detected and used to identify adhesive strips 10.
  • a corresponding detector (not shown) is arranged on the side of the irradiation device 6 and can be designed to detect the radiation and / or diffusely reflected, ie remitted, radiation reflected by the bank note 1.
  • an integrating sphere a so-called Ulbricht sphere, can be provided to detect the diffuse reflection.
  • the intensity T of the radiation 3 transmitted by the bank note is plotted here over the wavelength ⁇ of the radiation 2 or 3.
  • the intensity T can be a measure of the actual, i.e. absolute, intensity of the radiation transmitted through the banknote or else by the size derived from it, e.g. a variable normalized to the transmission in a certain spectral range.
  • the difference in light transmitted through the spot on the bill without adhesive strips B intensity T occurs clearly the light transmitted through the place on the banknote with tape B + S intensity T in the WEL • wavelength region a forward and is in the wavelength range b most pronounced.
  • the wavelength ranges a and b can, in principle, be between 2.5 ⁇ m and 25 ⁇ m in the entire middle infrared range.
  • the area a is preferably between 5.5 ⁇ m and 6 ⁇ m and the area b is between 5.7 ⁇ m and 5.8 ⁇ m. In these wavelength ranges, particularly large differences in the transmission behavior are detected for a large number of different banknote types and common types of adhesive tape, which means that even very thin adhesive tapes with typical thicknesses between - lo ⁇
  • the radiation 3 transmitted by the banknote 1 to be checked in the wavelength ranges a or b is detected by the detector 4 and used for the detection of adhesive strips 10.
  • the measured absolute intensity of the radiation 3 is preferably used as a measure of the transmitted radiation.
  • a variable derived from the intensity of the radiation 3 can also be used, e.g. the intensity of the radiation normalized to the transmission in other spectral ranges 3.
  • Plastic-coated banknotes made of paper or cotton so-called paper / polymer banknotes, can be recognized with a high degree of reliability since, despite the plastic coating, significant differences in the transmission behavior between areas with and without adhesive strips are detected in the wavelength ranges mentioned.
  • the invention is also suitable for the detection of adhesive strips on plastic banknotes, so-called polymer banknotes.
  • a wavelength range in the MIR is selected in which both the polymer banknotes and the adhesive strips to be detected have a low, but non-zero transmittance.
  • a strong absorption band is chosen, in which, however, neither the polymer banknotes nor the adhesive strips completely absorb the radiation passing through.
  • the transmitted radiation is then heavily dependent on the thickness, so that adhesive strips on polymer banknotes can be detected with great sensitivity due to the associated differences in thickness.
  • preferred wavelength ranges are between 2.7 ⁇ m and 3.6 ⁇ m, in particular between 2.7 ⁇ m and 3.0 ⁇ m or between 3.3 ⁇ m and 3.6 ⁇ m.
  • the thickness dependence of the transmitted radiation is particularly pronounced and the detection of adhesive strips is particularly reliable.

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  • Physics & Mathematics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • General Health & Medical Sciences (AREA)
  • Toxicology (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Inspection Of Paper Currency And Valuable Securities (AREA)

Abstract

L'invention concerne un dispositif et un procédé correspondant permettant d'identifier des objets étrangers, notamment des bandes adhésives, sur ou dans des billets de banque (1). Ledit dispositif comprend au moins un dispositif d'exposition à des rayonnements (6) pour exposer un billet de banque (1) à examiner, à l'action de rayonnements électromagnétiques (2), au moins un détecteur (4) pour détecter le rayonnement (3) transmis par le billet de banque (1) et un dispositif d'évaluation (5) pour identifier des objets étrangers (10) situés sur ou dans le billet de banque (1) sur la base du rayonnement (3) détecté. Afin de renforcer la fiabilité lors de l'identification d'objets étrangers, il est prévu que la longueur d'ondes du rayonnement (2, 3) se situe dans l'infrarouge moyen (IRM). Dans cette plage spectrale, il se produit de nettes différences dans le comportement en transmission et en réflexion des zones de billet de banque (21) munies ou non de bandes adhésives (10). A des longueurs d'ondes comprises entre 5, 5 et 6 νm, notamment entre 5,7 et 5,8 νm, ces différences sont particulièrement importantes, de sorte à parvenir une très grande sensibilité d'identification, y compris dans le cas de fines bandes adhésives.
PCT/EP2003/006325 2002-06-19 2003-06-16 Identification d'objets etrangers sur ou dans des billets de banque WO2004001684A1 (fr)

Priority Applications (1)

Application Number Priority Date Filing Date Title
AU2003246439A AU2003246439A1 (en) 2002-06-19 2003-06-16 Recognition of foreign objects on or in banknotes

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
DE10227354.5 2002-06-19
DE10227354A DE10227354A1 (de) 2002-06-19 2002-06-19 Erkennung von Fremdobjekten auf oder in Banknoten

Publications (1)

Publication Number Publication Date
WO2004001684A1 true WO2004001684A1 (fr) 2003-12-31

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ID=29719254

Family Applications (1)

Application Number Title Priority Date Filing Date
PCT/EP2003/006325 WO2004001684A1 (fr) 2002-06-19 2003-06-16 Identification d'objets etrangers sur ou dans des billets de banque

Country Status (3)

Country Link
AU (1) AU2003246439A1 (fr)
DE (1) DE10227354A1 (fr)
WO (1) WO2004001684A1 (fr)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014041564A1 (fr) * 2012-09-12 2014-03-20 Council Of Scientific & Industrial Research Composition de marqueurs de sécurité dissimulés et procédé d'authentification

Families Citing this family (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE102013006925A1 (de) * 2013-04-22 2014-10-23 Giesecke & Devrient Gmbh Vorrichtung und Verfahren zur Prüfung von Wertdokumenten, insbesondere Banknoten, sowie Wertdokumentbearbeitungssystem
US10347069B2 (en) 2013-04-22 2019-07-09 Giesecke+Devrient Currency Technology Gmbh Apparatus, method and assembly for checking value documents, in particular bank notes, and value-document processing system

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4524276A (en) * 1982-04-06 1985-06-18 Tokyo Shibaura Denki Kabushiki Kaisha Apparatus for detecting a security thread embedded in a paper-like material
JPH1063912A (ja) * 1996-08-13 1998-03-06 Toshiba Corp 集光分光光学系及び付着物検知装置

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4524276A (en) * 1982-04-06 1985-06-18 Tokyo Shibaura Denki Kabushiki Kaisha Apparatus for detecting a security thread embedded in a paper-like material
JPH1063912A (ja) * 1996-08-13 1998-03-06 Toshiba Corp 集光分光光学系及び付着物検知装置

Non-Patent Citations (1)

* Cited by examiner, † Cited by third party
Title
PATENT ABSTRACTS OF JAPAN vol. 1998, no. 08 30 June 1998 (1998-06-30) *

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
WO2014041564A1 (fr) * 2012-09-12 2014-03-20 Council Of Scientific & Industrial Research Composition de marqueurs de sécurité dissimulés et procédé d'authentification

Also Published As

Publication number Publication date
AU2003246439A1 (en) 2004-01-06
DE10227354A1 (de) 2004-01-08

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