WO1999009382A1 - Detector methods and apparatus - Google Patents
Detector methods and apparatus Download PDFInfo
- Publication number
- WO1999009382A1 WO1999009382A1 PCT/GB1998/001870 GB9801870W WO9909382A1 WO 1999009382 A1 WO1999009382 A1 WO 1999009382A1 GB 9801870 W GB9801870 W GB 9801870W WO 9909382 A1 WO9909382 A1 WO 9909382A1
- Authority
- WO
- WIPO (PCT)
- Prior art keywords
- radiation
- wavelength band
- signal
- stimulation
- wavelengths
- Prior art date
Links
- 238000000034 method Methods 0.000 title claims abstract description 31
- 230000005855 radiation Effects 0.000 claims abstract description 108
- 239000000463 material Substances 0.000 claims description 38
- 230000000638 stimulation Effects 0.000 claims description 21
- 238000012935 Averaging Methods 0.000 claims description 7
- 238000005070 sampling Methods 0.000 claims description 3
- 230000001678 irradiating effect Effects 0.000 claims description 2
- 230000004936 stimulating effect Effects 0.000 claims description 2
- 239000000758 substrate Substances 0.000 claims 2
- 230000001419 dependent effect Effects 0.000 claims 1
- 230000003595 spectral effect Effects 0.000 description 5
- 238000004020 luminiscence type Methods 0.000 description 4
- 108010010803 Gelatin Proteins 0.000 description 2
- 238000010276 construction Methods 0.000 description 2
- 238000001514 detection method Methods 0.000 description 2
- 230000000694 effects Effects 0.000 description 2
- 229920000159 gelatin Polymers 0.000 description 2
- 239000008273 gelatin Substances 0.000 description 2
- 235000019322 gelatine Nutrition 0.000 description 2
- 235000011852 gelatine desserts Nutrition 0.000 description 2
- 239000011521 glass Substances 0.000 description 2
- 238000005286 illumination Methods 0.000 description 2
- 206010073306 Exposure to radiation Diseases 0.000 description 1
- 238000006243 chemical reaction Methods 0.000 description 1
- 150000001875 compounds Chemical class 0.000 description 1
- 238000000921 elemental analysis Methods 0.000 description 1
- QSHDDOUJBYECFT-UHFFFAOYSA-N mercury Chemical compound [Hg] QSHDDOUJBYECFT-UHFFFAOYSA-N 0.000 description 1
- 229910052753 mercury Inorganic materials 0.000 description 1
- 125000006850 spacer group Chemical group 0.000 description 1
- 238000001228 spectrum Methods 0.000 description 1
- 230000001360 synchronised effect Effects 0.000 description 1
Classifications
-
- G—PHYSICS
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J3/44—Raman spectrometry; Scattering spectrometry ; Fluorescence spectrometry
- G01J3/4406—Fluorescence spectrometry
-
- 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
- G01—MEASURING; TESTING
- G01J—MEASUREMENT OF INTENSITY, VELOCITY, SPECTRAL CONTENT, POLARISATION, PHASE OR PULSE CHARACTERISTICS OF INFRARED, VISIBLE OR ULTRAVIOLET LIGHT; COLORIMETRY; RADIATION PYROMETRY
- G01J3/00—Spectrometry; Spectrophotometry; Monochromators; Measuring colours
- G01J3/28—Investigating the spectrum
- G01J2003/2866—Markers; Calibrating of scan
Definitions
- the invention relates in one aspect to a method and apparatus for detecting radiation in a relatively narrow wavelength band within radiation having a wider range of wavelengths .
- One approach to detecting such a spectral response would be to utilise a detector which can only detect radiation within the specified wavelength band. Typically, this would be by choosing a filter with a pass band corresponding to the spectral response wave band. Suitable glass filters may not exist, however, and so it is necessary to use specially designed interference filters. These are difficult to obtain and are expensive, especially in small quantities, and cannot easily be cut to the shapes required for small detectors.
- a method of detecting radiation in a relatively narrow wavelength band within radiation having a wider range of wavelengths comprises detecting radiation in a first wavelength band including the narrow wavelength band and other wavelengths; detecting radiation in a second wavelength band which comprises substantially only the other wavelengths; and comparing the levels of detected radiation to determine the presence of radiation in the said narrow wavelength band.
- apparatus for detecting radiation in a relatively narrow wavelength band within radiation having a wider range of wavelengths comprises a first detector for detecting radiation in a first wavelength band including the narrow wavelength band and other wavelengths; a second detector for detecting radiation in a second wavelength band which comprises substantially only the other wavelengths; and a processor for comparing the levels of detected radiation to determine the presence of radiation in the said narrow wavelength band.
- the upper limit of the first wavelength band substantially corresponds to the upper limit of the second wavelength band.
- the lower limit of the two wavelength bands may substantially coincide.
- the radiation may lie in the visible wavelength range but typically lies outside the visible wavelength range, for example in the infrared or ultraviolet ranges.
- a first signal is generated corresponding to radiation detected within the first wavelength band and a second signal is generated corresponding to radiation generated within the second wavelength band and the comparison step comprises subtracting the second signal from the first signal.
- the comparison step comprises subtracting the second signal from the first signal.
- the detectors may only be responsive to wavelengths within the specified wavelength bands.
- the apparatus includes a number of filters, the filters having pass bands such that each detector receives only radiation in a respective one of the first and second wavelength bands.
- the detectors will typically comprise photodiodes or the like.
- the radiation may be generated from a variety of sources.
- One such source is a material which generates radiation in response to external stimulation.
- the material will be stimulated by irradiating the material with radiation in a continuous manner. This may comprise irradiation in either the visible or invisible wavelength bands. The result of continuous radiation results in a measure of the luminescence of the material but cannot distinguish between fluorescence and phosphorescence and in some cases it is necessary to make that distinction.
- the ability to distinguish between fluorescent and phosphorescent radiation is useful not only in the present context but also more generally.
- We have, therefore, devised a new method in accordance with a third aspect of the present invention for distinguishing between fluorescent and phosphorescent radiation emitted from a material in response to an external stimulation comprising stimulating the material using a modulated stimulation to cause the material to emit fluorescent and/or phosphorescent radiation; sensing radiation emitted by the stimulated material; generating a first signal representing total radiation emitted by the stimulated material; generating a second signal representing radiation emitted by the material with substantially the same modulation as the stimulation; and determining the difference between the first and second signals whereby the second signal represents the presence of fluorescent radiation and the difference between the two signals represents the presence of phosphorescent radiation.
- a fourth aspect of the present invention provides apparatus for detecting radiation in a relatively narrow wavelength band within radiation having a wider range of wavelengths, the apparatus comprising a first detector for detecting radiation in a first wavelength band including the narrow wavelength band and other wavelengths; a second detector for detecting radiation in a second wavelength band which comprises substantially only the other wavelengths; and a processor for comparing the levels of detected radiation to determine the presence of radiation in the said narrow wavelength band.
- the invention makes use of the fact that fluorescent radiation responds substantially immediately to the stimulation whereas phosphorescent radiation once initiated decays over a relatively long period and so will not exhibit a modulation similar to that of the stimulation.
- the first signal therefore represents a measure of the luminescence (fluorescence and phosphorescence) ; the second signal represents fluorescence alone; and the difference between the two signals represents phosphorescence alone.
- This method and apparatus is particularly suitable for use with methods and apparatus according to the first and second aspects of the invention where the material is phosphorescent and has an emission wavelength closely similar to other non-phosphorescent materials.
- the material will typically be stimulated by exposing it to radiation having a wavelength in the visible or near- visible region. However, other forms of stimulation such as heat could be used with suitable materials.
- any reflected radiation is removed prior to generating the first- and second signals.
- the first and second detectors may each constitute also a sensor.
- the first signal is generated by averaging the received radiation over a sampling interval; while the second signal may be generated by detecting radiation from the material which has been modulated with substantially the same frequency as the external stimulation, and determining the amplitude of the detected radiation to constitute the second signal. It should be understood, however, that although the invention is particularly suitable for analogue processing, the generation and use of the first and second signals may be handled digitally using a suitably programmed computer.
- Figure 1 is a cross-section through a detector head
- Figure 2 illustrates banknote sorting apparatus incorporating the detector head shown in Figure 1;
- Figure 3 illustrates the first and second wavelength bands and a narrow band to be detected;
- Figure 4 illustrates a first example of apparatus for processing signals from the detectors
- Figure 5 illustrates a second example of apparatus for processing signals from the detectors.
- the apparatus shown in Figures 1 and 2 is for sorting banknotes between those which are genuine and those which are fraudulent or suspected of being fraudulent. This distinction is made by inspecting each note as it passes under a detector head 1 to see whether an ink emits radiation within a specific narrow wavelength band 42 ( Figure 3) upon illumination.
- the sorting apparatus includes a hopper 2 in which a stack of banknotes 3 is provided, the hopper 2 having an outlet opening 4 through which individual banknotes are fed upon rotation of a roller 5.
- the banknotes 4 are fed in any conventional manner, for example via friction belts, vacuum feed devices or the like along a path 6 beneath the detector head 1.
- the detector head inspects each banknote as will be explained in more detail below and a processor 7 connected with the detector head 1 determines whether or not the narrow band radiation has been detected.
- the processor 7 controls a diverter 8 either to allow the banknotes to pass on for further processing along a path 9 when a genuine banknote is detected or to divert a banknote into a reject hopper 10 when a suspected fraudulent banknote is detected.
- the construction of the detector head 1 is shown in more detail in Figure 1 and comprises a housing 20 which is mounted via a support bracket 21 to a casing of the sorting apparatus (not shown) .
- the housing 20 includes a lens housing 22 in which is mounted a pair of focusing lenses 23,24.
- the lens 23 is sealed to the housing 22 via an O- ring 25 and is held in position by an annular spacer 26.
- a gelatin filter 27 is provided above the lens 24 to absorb any reflected UV light. Above the gelatin filter 27 is located an IR interference filter 28 which absorbs all wavelengths above a wavelength ⁇ 1 . Light which has passed through the filters 27,28 then impinges on a laterally spaced pair of glass filters 29,30 which are aligned with respective photodiode detectors 31,32.
- the filter 29 absorbs radiation below about ⁇ 2 and the filter 30 absorbs radiation below about ⁇ 3 .
- the effect of these filters in combination is that radiation impinging on the photodiode 31 falls within a first wavelength band 40 ( Figure 3) extending from ⁇ 2 to ⁇ 1 while radiation impinging on the photodiode 32 falls within a second wavelength band ranging from ⁇ 3 to ⁇ ,, .
- the filters 29,30 have sharp lower cut-offs, the narrow wavelength band 42 of the material to be detected falling between these cut-offs.
- a pair of mercury discharge lamps 33,34 are provided, one on each side of the lens housing 22 for illuminating banknotes as they pass beneath the head 1.
- the illumination wavelength generated by the lamps is chosen to correspond to that which will stimulate the ink, if present, to generate radiation within the narrow wavelength band 42. This may cause the ink to fluoresce or phosphoresce, or both.
- the photodiodes 31,32 are connected to a subtractor 35 ( Figure 4) mounted on a printed circuit board 36. If the signal supplied by the photodiode 31 is labelled A and that from the photodiode 32 is labelled B, the output from the subtractor 35 is A-B.
- the output from the subtractor 35 will represent the intensity of radiation received in the wave band 40 but not in the wave band 41.
- This difference signal will then be compared with a threshold by the processor 7, after A/D conversion, and if greater than the threshold will indicate the presence of the special ink. If the ink is not present then the processor 7 will cause the diverter 8 to move to the position shown in dashed lines in Figure 2 and the note will be rejected.
- a delay 36 is built into one of the lines from the photodiodes 31,32 to the subtractor 35 to compensate for movement of the banknote beneath the photodiodes 31,32.
- the photodiodes 31,32 measure the total luminescence generated by the ink and the lamps 33,34 will be continuously illuminated.
- the ink may phosphoresce within the wavelength band 42.
- the radiation due to phosphorescence must be distinguished from that due to fluorescence.
- Figure 5 illustrates a circuit which can make that distinction.
- the lamps 33,34 are modulated on and off by a lamp control circuit 50 which responds to a clock input from a source 51.
- the output from each diode 31,32 is fed in parallel to a respective averaging filter 52,54 and to a respective bandpass filter 53,55.
- the outputs of the bandpass filters 53,55 are fed to respective amplitude detectors 56,57.
- the outputs of the averaging filter 52 and the amplitude detector 56 are fed to a subtractor 58 while the outputs of the averaging filter 54 and the amplitude detector 57 are fed to a subtractor 59.
- the characteristics of the averaging filters 52,54 are such that they only pass frequencies below the modulation frequency of the lamp 50, and so the signals fed to the non- inverting inputs of the subtracters 58,59 represent the received luminescence (phosphorescence plus fluorescence) .
- the characteristics of the bandpass filters 53,55 are such that they pass only frequencies including and close to the modulation frequency of the lamp. Any phosphorescence signal will decay much more slowly and will be substantially eliminated by the filters 53,55 and so the signals E,F fed from the amplitude detectors to the inverting inputs of the subtractors 58,59 represent the received fluorescence.
- the amplitude detectors 56,57 are necessary to determine the amplitude of the output generated by the bandpass filters 53,55.
- a synchronous detector driven by the clock signal may replace bandpass filter 53 and the amplitude detector 56 or bandpass filter
- Each subtractor 58,59 then subtracts the fluorescence signal from the fluorescent/phosphorescent signal to generate output signals C,D which represent phosphorescence.
- These signals C,D are then processed in the same way as the signals A,B in Figure 4 by passing them to a subtractor 61 which generates an output signal representing the intensity of radiation received in the wavelength band 40 but not the wavelength band 41.
- the signal C is passed to the subtractor 61 via a delay 60 to compensate for movement of the banknotes beneath the photodiodes 31,32.
- the fluorescence signals E,F may also be processed in the same way as signals A,B in figure 4, or in any other way to assist the authentication of the ink.
- Figure 6 illustrates a specific example of the characteristics of the filters 28, 29 and 30.
- Figure 6A illustrates the individual characteristics of those filters while
- Figure 6B illustrates the effect of superposing the filters resulting in wavebands 40,41 described earlier.
- Figure 6C illustrates the narrow band 42 resulting from subtracting wavelength band 41 from wavelength band 40. It will be noted that the response of the difference extends up into waveband 41. This is inevitable unless the characteristic of filter 30 is infinitely steep - a physical impossibility.
- the example as shown is suitable for detecting a narrow spike in the region 540 to 570nm, i.e. between the lower cut-offs of wavebands 40 and 41, which are the same as the lower cut-offs of filters 29 and 30, respectively.
Landscapes
- Physics & Mathematics (AREA)
- Spectroscopy & Molecular Physics (AREA)
- General Physics & Mathematics (AREA)
- Health & Medical Sciences (AREA)
- General Health & Medical Sciences (AREA)
- Toxicology (AREA)
- Investigating, Analyzing Materials By Fluorescence Or Luminescence (AREA)
- Inspection Of Paper Currency And Valuable Securities (AREA)
- Spectrometry And Color Measurement (AREA)
Abstract
Description
Claims
Priority Applications (3)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
AU81226/98A AU8122698A (en) | 1997-08-13 | 1998-06-26 | Detector methods and apparatus |
JP2000510000A JP2001516012A (en) | 1997-08-13 | 1998-06-26 | Detection method and device |
EP98930952A EP1004006A1 (en) | 1997-08-13 | 1998-06-26 | Detector methods and apparatus |
Applications Claiming Priority (2)
Application Number | Priority Date | Filing Date | Title |
---|---|---|---|
GB9717194.6 | 1997-08-13 | ||
GBGB9717194.6A GB9717194D0 (en) | 1997-08-13 | 1997-08-13 | Detector methods and apparatus |
Publications (1)
Publication Number | Publication Date |
---|---|
WO1999009382A1 true WO1999009382A1 (en) | 1999-02-25 |
Family
ID=10817451
Family Applications (1)
Application Number | Title | Priority Date | Filing Date |
---|---|---|---|
PCT/GB1998/001870 WO1999009382A1 (en) | 1997-08-13 | 1998-06-26 | Detector methods and apparatus |
Country Status (7)
Country | Link |
---|---|
US (1) | US6024202A (en) |
EP (1) | EP1004006A1 (en) |
JP (1) | JP2001516012A (en) |
CN (1) | CN1266485A (en) |
AU (1) | AU8122698A (en) |
GB (1) | GB9717194D0 (en) |
WO (1) | WO1999009382A1 (en) |
Cited By (7)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
WO2001041079A1 (en) * | 1999-12-03 | 2001-06-07 | Giesecke & Devrient Gmbh | Device and method for verifying the authenticity of banknotes |
EP1107222A2 (en) * | 1999-12-02 | 2001-06-13 | Visteon Global Technologies, Inc. | Photopic brightness controller for fluorescent backlights |
WO2001054076A1 (en) * | 2000-01-24 | 2001-07-26 | De La Rue International Limited | Document monitoring method |
JP2001307170A (en) * | 2000-04-20 | 2001-11-02 | Nidec Copal Corp | Fluorescent thread detector of paper sheets |
EP2056260A3 (en) * | 2007-09-20 | 2010-02-17 | Giesecke & Devrient GmbH | Device and method for checking valuable documents |
EP2549445A1 (en) * | 2010-03-17 | 2013-01-23 | Glory Ltd. | Genuine/counterfeit distinguishing unit, genuine/counterfeit distinguishing method, and fluorescent sensor |
WO2015178384A1 (en) * | 2014-05-22 | 2015-11-26 | グローリー株式会社 | Fluorescence/phosphorescence detection device |
Families Citing this family (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE19651101A1 (en) * | 1996-12-09 | 1998-06-10 | Giesecke & Devrient Gmbh | Device and method for the detection of fluorescent and phosphorescent light |
JP2002157627A (en) * | 2000-11-20 | 2002-05-31 | Nidec Copal Corp | Fluorescent thread detecting device |
DE10127837A1 (en) * | 2001-06-08 | 2003-01-23 | Giesecke & Devrient Gmbh | Device and method for examining documents |
US6998623B2 (en) * | 2002-02-28 | 2006-02-14 | Nidec Copal Corporation | Sheets fluorescence detecting sensor |
DE102004024620A1 (en) * | 2004-05-18 | 2005-12-08 | Giesecke & Devrient Gmbh | Apparatus and method for checking banknotes |
EP1647947A1 (en) * | 2004-10-14 | 2006-04-19 | Giesecke & Devrient GmbH | Apparatus and method for checking a luminescent security feature |
DE102005041054A1 (en) * | 2005-08-30 | 2007-03-01 | Giesecke & Devrient Gmbh | Bank notes e.g. US-notes, originality verification method, involves providing material as authenticity feature activated for emission of luminance radiation, to bank notes, and detecting emitted radiation in specific wavelength range |
GB0814909D0 (en) * | 2008-08-14 | 2008-09-24 | Rue De Int Ltd | Phosphorescence detector |
JP2010243363A (en) * | 2009-04-07 | 2010-10-28 | Toshiba Corp | Fluorescence detection device |
JP5367509B2 (en) * | 2009-08-27 | 2013-12-11 | 株式会社東芝 | Photodetection device and paper sheet processing apparatus provided with the photodetection device |
JP5732337B2 (en) * | 2011-07-15 | 2015-06-10 | 株式会社半導体エネルギー研究所 | Phosphorescence measurement method |
DE102011117678A1 (en) | 2011-11-04 | 2013-05-08 | Giesecke & Devrient Gmbh | Sensor for checking value documents |
WO2014132415A1 (en) * | 2013-02-28 | 2014-09-04 | グローリー株式会社 | Fluorescence and phosphorescence detecting method and device, and valuable media authenticity determining method and device |
Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
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DE849016C (en) * | 1951-01-13 | 1952-09-11 | Siemens Ag | Method and device for measuring the radiation intensity of an ultraviolet emitter that is attributable to a certain wavelength |
EP0174506A2 (en) * | 1984-08-31 | 1986-03-19 | Firma Carl Zeiss | Fibre-optic sensor with a fluorescent substance |
US4647202A (en) * | 1983-12-29 | 1987-03-03 | Hitachi, Ltd. | Spectrophosphorimetry |
WO1991011703A1 (en) * | 1990-02-02 | 1991-08-08 | Thomas De La Rue And Company Limited | Detection apparatus |
US5039219A (en) * | 1989-05-26 | 1991-08-13 | Photon Technology | Luminescence system and method for determining the nature of substances by measuring fluorescence and phosphorescence properties |
EP0600633A2 (en) * | 1992-12-01 | 1994-06-08 | Enrico Gratton | Time resolved optical array detectors and CCD cameras for frequency domain fluorometry &/or phosphorimetry |
DE4438905A1 (en) * | 1994-11-03 | 1995-11-16 | Schott Glaswerke | Predetermined region light source spectral intensity determn. method for e.g. analytical purposes |
EP0747680A2 (en) * | 1995-06-07 | 1996-12-11 | Santa Barbara Research Center | High resolution differential spectrometry system |
Family Cites Families (2)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
US4178102A (en) * | 1977-09-20 | 1979-12-11 | U.S. Philips Corporation | Process and apparatus for measuring the concentration of a molecule of selective spectrum in a sample substance |
GB8311795D0 (en) * | 1983-04-29 | 1983-06-02 | De La Rue Syst | Detecting luminescent security features |
-
1997
- 1997-08-13 GB GBGB9717194.6A patent/GB9717194D0/en active Pending
-
1998
- 1998-01-20 US US09/009,411 patent/US6024202A/en not_active Expired - Fee Related
- 1998-06-26 JP JP2000510000A patent/JP2001516012A/en active Pending
- 1998-06-26 WO PCT/GB1998/001870 patent/WO1999009382A1/en not_active Application Discontinuation
- 1998-06-26 AU AU81226/98A patent/AU8122698A/en not_active Abandoned
- 1998-06-26 CN CN98808130A patent/CN1266485A/en active Pending
- 1998-06-26 EP EP98930952A patent/EP1004006A1/en not_active Withdrawn
Patent Citations (8)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
DE849016C (en) * | 1951-01-13 | 1952-09-11 | Siemens Ag | Method and device for measuring the radiation intensity of an ultraviolet emitter that is attributable to a certain wavelength |
US4647202A (en) * | 1983-12-29 | 1987-03-03 | Hitachi, Ltd. | Spectrophosphorimetry |
EP0174506A2 (en) * | 1984-08-31 | 1986-03-19 | Firma Carl Zeiss | Fibre-optic sensor with a fluorescent substance |
US5039219A (en) * | 1989-05-26 | 1991-08-13 | Photon Technology | Luminescence system and method for determining the nature of substances by measuring fluorescence and phosphorescence properties |
WO1991011703A1 (en) * | 1990-02-02 | 1991-08-08 | Thomas De La Rue And Company Limited | Detection apparatus |
EP0600633A2 (en) * | 1992-12-01 | 1994-06-08 | Enrico Gratton | Time resolved optical array detectors and CCD cameras for frequency domain fluorometry &/or phosphorimetry |
DE4438905A1 (en) * | 1994-11-03 | 1995-11-16 | Schott Glaswerke | Predetermined region light source spectral intensity determn. method for e.g. analytical purposes |
EP0747680A2 (en) * | 1995-06-07 | 1996-12-11 | Santa Barbara Research Center | High resolution differential spectrometry system |
Cited By (13)
Publication number | Priority date | Publication date | Assignee | Title |
---|---|---|---|---|
EP1107222A2 (en) * | 1999-12-02 | 2001-06-13 | Visteon Global Technologies, Inc. | Photopic brightness controller for fluorescent backlights |
EP1107222A3 (en) * | 1999-12-02 | 2001-09-12 | Visteon Global Technologies, Inc. | Photopic brightness controller for fluorescent backlights |
WO2001041079A1 (en) * | 1999-12-03 | 2001-06-07 | Giesecke & Devrient Gmbh | Device and method for verifying the authenticity of banknotes |
WO2001054076A1 (en) * | 2000-01-24 | 2001-07-26 | De La Rue International Limited | Document monitoring method |
US6970235B2 (en) | 2000-01-24 | 2005-11-29 | De La Rue International Limited | Document monitoring method |
JP2001307170A (en) * | 2000-04-20 | 2001-11-02 | Nidec Copal Corp | Fluorescent thread detector of paper sheets |
EP2056260A3 (en) * | 2007-09-20 | 2010-02-17 | Giesecke & Devrient GmbH | Device and method for checking valuable documents |
US7829869B2 (en) | 2007-09-20 | 2010-11-09 | Giesecke & Devrient Gmbh | Method and apparatus for checking documents of value |
EP2549445A1 (en) * | 2010-03-17 | 2013-01-23 | Glory Ltd. | Genuine/counterfeit distinguishing unit, genuine/counterfeit distinguishing method, and fluorescent sensor |
EP2549445A4 (en) * | 2010-03-17 | 2013-12-04 | Glory Kogyo Kk | Genuine/counterfeit distinguishing unit, genuine/counterfeit distinguishing method, and fluorescent sensor |
WO2015178384A1 (en) * | 2014-05-22 | 2015-11-26 | グローリー株式会社 | Fluorescence/phosphorescence detection device |
JP2015222463A (en) * | 2014-05-22 | 2015-12-10 | グローリー株式会社 | Fluorescent light and phosphorescence detection device |
US9841379B2 (en) | 2014-05-22 | 2017-12-12 | Glory Ltd. | Fluorescence and phosphorescence detecting apparatus |
Also Published As
Publication number | Publication date |
---|---|
CN1266485A (en) | 2000-09-13 |
US6024202A (en) | 2000-02-15 |
AU8122698A (en) | 1999-03-08 |
GB9717194D0 (en) | 1997-10-22 |
EP1004006A1 (en) | 2000-05-31 |
JP2001516012A (en) | 2001-09-25 |
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