EP0278976A1 - Procede et appareil permettant de distinguer des surfaces photoluminescentes et reflechissantes dans des applications du domaine des sciences legales - Google Patents

Procede et appareil permettant de distinguer des surfaces photoluminescentes et reflechissantes dans des applications du domaine des sciences legales

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Publication number
EP0278976A1
EP0278976A1 EP87905927A EP87905927A EP0278976A1 EP 0278976 A1 EP0278976 A1 EP 0278976A1 EP 87905927 A EP87905927 A EP 87905927A EP 87905927 A EP87905927 A EP 87905927A EP 0278976 A1 EP0278976 A1 EP 0278976A1
Authority
EP
European Patent Office
Prior art keywords
sources
light
wavelength
radiation
filter
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.)
Withdrawn
Application number
EP87905927A
Other languages
German (de)
English (en)
Other versions
EP0278976A4 (fr
Inventor
Milutin Stoilovic
Ronald Norman Warrener
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.)
Australian National University
Original Assignee
Australian National University
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 Australian National University filed Critical Australian National University
Publication of EP0278976A1 publication Critical patent/EP0278976A1/fr
Publication of EP0278976A4 publication Critical patent/EP0278976A4/fr
Withdrawn legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10821—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum further details of bar or optical code scanning devices
    • G06K7/10831—Arrangement of optical elements, e.g. lenses, mirrors, prisms
    • A—HUMAN NECESSITIES
    • A61—MEDICAL OR VETERINARY SCIENCE; HYGIENE
    • A61B—DIAGNOSIS; SURGERY; IDENTIFICATION
    • A61B5/00—Measuring for diagnostic purposes; Identification of persons
    • A61B5/117—Identification of persons
    • A61B5/1171—Identification of persons based on the shapes or appearances of their bodies or parts thereof
    • A61B5/1172—Identification of persons based on the shapes or appearances of their bodies or parts thereof using fingerprinting
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/645—Specially adapted constructive features of fluorimeters
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/10544—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation by scanning of the records by radiation in the optical part of the electromagnetic spectrum
    • G06K7/10554—Moving beam scanning
    • G06K7/10594—Beam path
    • G06K7/10683—Arrangement of fixed elements
    • G06K7/10702—Particularities of propagating elements, e.g. lenses, mirrors
    • G—PHYSICS
    • G06—COMPUTING; CALCULATING OR COUNTING
    • G06K—GRAPHICAL DATA READING; PRESENTATION OF DATA; RECORD CARRIERS; HANDLING RECORD CARRIERS
    • G06K7/00—Methods or arrangements for sensing record carriers, e.g. for reading patterns
    • G06K7/10—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation
    • G06K7/12—Methods or arrangements for sensing record carriers, e.g. for reading patterns by electromagnetic radiation, e.g. optical sensing; by corpuscular radiation using a selected wavelength, e.g. to sense red marks and ignore blue marks
    • 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
    • G01J3/12—Generating the spectrum; Monochromators
    • G01J2003/1226—Interference filters
    • G01J2003/1239—Interference filters and separate detectors
    • 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
    • G01J3/12—Generating the spectrum; Monochromators
    • G01J2003/1226—Interference filters
    • G01J2003/1243—Pivoting IF or other position variation
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N2021/6417—Spectrofluorimetric devices
    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01N—INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
    • G01N21/00—Investigating or analysing materials by the use of optical means, i.e. using sub-millimetre waves, infrared, visible or ultraviolet light
    • G01N21/62—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light
    • G01N21/63—Systems in which the material investigated is excited whereby it emits light or causes a change in wavelength of the incident light optically excited
    • G01N21/64—Fluorescence; Phosphorescence
    • G01N21/6428—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes"
    • G01N2021/6439—Measuring fluorescence of fluorescent products of reactions or of fluorochrome labelled reactive substances, e.g. measuring quenching effects, using measuring "optrodes" with indicators, stains, dyes, tags, labels, marks

Definitions

  • TITLE "METHOD AND APPARATUS FOR DISTINGUISHING PHOTOLUMINESCENT AND REFLECTING SURFACES IN FORENSIC SCIENCE APPLICATIONS"
  • TECHNICAL FIELD This invention concerns photoluminescence and light absorption techniques in forensic science. More particularly, it concerns a technique for distinguishing between emitted light of wavelengths which are close to each other, but which differ by several nanometres, and for distinguishing between surface regions which reflect light at respective wavelengths which are close to each other but which differ by several nanometres. Such a technique may be used to improve the detection and observation of latent fingerprints and in the analysis of in on documents, but it is not limited to such uses.
  • This invention also concerns the selection of the most efficient wavelength from a non-monochromatic source for the illumination of an area of an object which contains a potentially photoluminescent material (or material which reflects light at a particular wavelength) .
  • the illumination to induce the photoluminescence can be by irradiation of the treated prints with light from a suitable laser (for example, an argon ion laser which produces, inter alia, light having a wavelength of 488 n ) , an arc lamp (such as a xenon arc lamp) with an appropriate filter, or an incandescent lamp
  • Another useful photoluminescence technique involves the secondary staining, with a photoluminescent dye, of fingerprints that have been treated by Superglue (trade mark).
  • a photoluminescent dye of fingerprints that have been treated by Superglue (trade mark).
  • the Superglue forms a deposit (as a polymer) preferentially on the fingerprint.
  • a photoluminescent stain can then be selectively absorbed by the preformed (and otherwise colourless) Superglue-treated print. The stained print is then readily observed when it is illuminated by light of a suitable wavelength.
  • Each barrier filter transmits a narrow band of light of a specific wavelength range and selection of an appropriate filter allows the small difference in wavelength between the photoluminescence from the fingerprint and other extraneous photoluminescence or light to be distinguished.
  • filter design is of paramount importance and is critical to the success of the detection technique.
  • barrier filters are expensive to produce and cover only a specific wavelength range. A change in the photoluminescence wavelength of the treated fingerprint, or other radiant source, by only a few nanometres will require a new specific barrier filter.
  • the light source used to illuminate the object bearing the treated fingerprint is an arc lamp or a quartz halogen lamp or other non-monochromatic source, a different filter is required to obtain the illuminating wavelength which causes the zinc, cadmium and mercury complexes to photoluminesce.
  • the need for multiple filters for the illumination arrangement adds considerably to the cost of the analysing equipment.
  • reflected light from a treated latent fingerprint is monitored.
  • the object bearing the treated latent fingerprint is illuminated with monochromatic light and, because the treated fingerprint reflects only light of a characteristic wavelength and absorbs all other wavelengths, the pattern of the fingerprint becomes visible as a dark image against the illuminated background surface of the object.
  • many objects such as bank deposit slips and cheques
  • both the latent fingerprint and the printed pattern become visible as dark regions against the illuminated background of the surface of the object.
  • the latent fingerprint pattern is often obscured by the pattern of the printed regions, the only way to clearly distinguish the fingerprint pattern is to illuminate the object with light which has a wavelength that is precisely the characteristic reflecting wavelength of the printed pattern. If this is done, the printed pattern and the background surface of the object reflect light of the same wavelength, and thus merge in the eye of an observer (and in a photographic film record of the object) , leaving the fingerprint pattern clearly visible.
  • To select the illuminating wavelength of the object to be precisely the reflecting characteristic wavelength of the printed pattern is not easy using a selection ,of monochromatic barrier interference filters - and is impossible if a filter of the required wavelength, is unavailable.
  • the first objective is achieved by mounting an interference filter between the photoluminescing object and the recording device in such a manner that the angle of incidence on to the filter of the light signal that is to be detected (that is, varying the angle of incidence on to the filter of the radiation being analysed) can be varied.
  • the objective of the second aspect of the invention is achieved by the additional or alternative step, when the illumination of the photoluminescing or reflecting area is not from a monochromatic light source, of mounting an interference filter in the illumination path so that it may be tilted to alter the angle of incidence upon it of the illuminating light beam.
  • the tilting of this filter alters the wavelength of the light transmitted past the filter assembly and falling on the potentially fluorescent object (or on the reflecting object).
  • the barrier filter located in front of the recording device is mounted in the same way as a filter is attached to the lenses of a photographic camera.
  • the light emitted from a treated fingerprint and its environment strikes the planar barrier interference filter orthogonally to the plane of the filter, immediately before it enters the recording camera (or similar device).
  • the specificity of the filter remains constant and of measureable efficiency.
  • the filter is tilted so that its plane is no longer orthogonal to the light path, its transmission wavelength is varied systematically as a function of the angular tilting of filter.
  • tilting the interference filter performs a "fine tuning" of its transmission wavelength.
  • the modification of the apparatus used to observe and record the fingerprint (or other photoluminescing region) is also simple.
  • the filter is mounted on a holder or support in a housing and means are provided to rotate the holder, thus enabling the filter to be tilted within the housing.
  • the means to rotate the holder will be provided with a scale which moves alongside a pointer or mark on the housing to indicate the angular tilt of the holder and hence of the filter.
  • An identical filter mounting arrangement is used to modify the illuminating arrangement for a potentially photoluminescent object.
  • a method of distinguishing between light from a plurality of closely spaced or adjacent photoluminescent sources, each of the sources emitting radiation at a wavelength which is close to, but different from, the wavelength of the radiation emitted by the other source or sources comprising the steps of a) interposing, between the sources and a monitor of the light therefrom, a planar interference filter which transmits orthogonally incident radiation in a predetermined wavelength range, this range either including the wavelengths of- the sources or having limits thereto which are close to and longer than the wavelengths of the sources ; and b) tilting the interference filter to alter the angle of incidence thereon of the light from the sources, to optimise the intensity of light received by the monitor from one or at least one source while simultaneously reducing the light received by the monitor from the other source or sources.
  • a method of providing a variable wavelength of illumination of an object for stimulating the emission of radiation from photoluminescent sources thereon or for illuminating a plurality of reflecting surfaces thereon comprises the steps of a) illuminating the object with light from a non-monochromatic illumination means; b) interposing a planar interference filter between the illumination means and the object; c) tilting the interference filter to vary the angle of incidence thereon of the light from the illumination means; and d) monitoring the light emitted from the sources during the tilting of the filter, to determine either (i) when the intensity of the light emitted from one or at least one of the sources is maximised while the intensity of the light emitted from the other, or at least one other, of the sources is reduced, or (ii) when an unwanted reflecting surface and the background surface of the object each reflect light of the same wavelength, so that the unwanted reflecting surface becomes indistinguishable from the background surface.
  • this variation may be instead of, or in addition to, the interposition of an interference filter between the sources and the monitor.
  • the invention will include the preliminary step of treating the object with chemicals and/or chemical reagents that render the latent fingerprint photoluminescent.
  • the present invention also encompasses a modified form of the apparatus used to distinguish between light from a plurality of simultaneously monitored photoluminescent sources, each of which emits radiation of a wavelength which is close to, but different from, the wavelength of radiation emitted by the other, or at least one other, source, the modification comprising the inclusion between the sources and the monitor of a mounting for an interference filter which permits the interference filter to be systematically tilted or rotated to alter the angle of incidence thereon of light from (or to) the sources.
  • the present invention further encompasses a modification of the illuminating arrangement for an object carrying a plurality of photoluminescent regions, or a plurality of reflecting surfaces, when the illuminating means is not monochromatic, the modification comprising the inclusion between the illuminating means and the object of a mounting for an interference filter which permits the interference filter to be tilted to alter the wavelength band of the light that is transmitted therethrough.
  • Figure 1 is a schematic diagram of the equipment used to enhance the detection and recordal of a fingerprint.
  • Figure 2 is a sectional view of a filter mount that has been used to rotatably support a filter in the equipment of Figure 1.
  • Figure 3 is a perspective sketch of the filter mount of Figure 2.
  • Figure 4 is a graph showing the variation of the central wavelength of an interference filter as the angle of incidence of the light transmitted through the filter is changed.
  • Figure 5 is a series of photographs showing the observed image of a latent fingerprint at different angles of tilt of an interference filter.
  • the equipment illustrated in Figure 1 includes a camera 10 which receives radiation from an object 11 (for example, a bank deposit slip, a cheque or the 5 like) that is supported in a foam plastic tray 12.
  • the object 11 believed to have a latent fingerprint on it, has been treated either with Superglue in the manner indicated above (or by the modified "fastglue fuming" technique, which is also known to those
  • the object 11 is irradiated with light from a "Unilite" (trade mark) xenon arc lamp
  • the irradiating light is passed through a first interference filter 14 mounted in a housing 30.
  • the filter 14 transmits light having a wavelength which initiates photoluminescence of the treated fingerprint.
  • the camera ' 10 is preferably a through-the-lens type of camera so that the image of the object 11 can be observed by the operator of the equipment before the fingerprint is photographed. If necessary, the camera can be removed from its mount until the required image of object 11 is observed by the operator of the equipment.
  • a television camera coupled to a video display screen, has been used in place of the photographic camera 10.
  • This alternative arrangement allows the operator of the equipment to observe the image of the fingerprint and to record the data in digital form for storage, transmission or data manipulation (such as image enhancement).
  • the interference filter 17 in the filter holder 19 would be fixed with the plane of the filter at right angles to the axis 20 of the camera lens system.
  • the interference filter 17 is supported in a filter mount of the type illustrated in Figures 2 and 3.
  • the filter mount of Figures 2 and 3 consists of a generally tubular housing 21 adapted to be fitted on to the lens system of the camera 10.
  • a planar interference filter 23 is firmly positioned.
  • the filter holder 22 is rotatabie about an axis in the plane of the filter using one (or both) of a pair of knobs 24 mounted on respective support axles 25 which extend through the wall of the housing 21 from diametrically opposite locations on the filter holder 22.
  • a scale 26 is attached to each knob 24. Each scale 26 passes alongside a pointer or other mark on the housing 21, which provides an indication of the angular tilt of the interference filter 23.
  • the filter 14 is also supported in a filter mount of the type shown in Figures 2 and 3.
  • the filter 14 is rotatabie about an axis in the plane of the filter using knobs 34 to which respective angular scales 36 are attached to provide an indication of the angle of tilt of filter 14 relative to the propagation direction of the collimated beam from the lamp 13.
  • Figure 4 shows the way in which the central wavelength transmitted by the filter 23 of Figure 2 changes as the angle of rotation of the filter in the housing 21 is varied.
  • the graph of Figure 4 illustrates the characteristic of a 4-band interference filter (central transmission wavelength of 590 nm, and half band width of 37 nm) produced by Omega Optical, Inc. of Brattleboro, Vermont, U.S.A.
  • the present inventors examined the ridge details of a number of latent fingerprints placed on coloured and patterned bank deposit slips.
  • the deposit slips were treated first with ninhydrin and then converted to the zinc or cadmium complex using known techniques. They were then illuminated with a "Unilite” xenon arc lamp through an appropriate filter which was tilted to a first position to transmit light to stimulate the photoluminescence of the zinc complex and to a second position to transmit light to stimulate the photoluminescence of the cadmium complex.
  • the initial illumination of the deposit slips revealed the coloured background pattern of the deposit slip and the location of the fingerprints, but only a little of the ridge detail of the fingerprints could be observed (due partly to the poor contrast between the photoluminescence from the weakly coloured prints and the light from the coloured pattern printed on the bank deposit slip and partly to " the inherent weakness of the photoluminescence) .
  • the deposit slip was cooled to the temperature of liquid nitrogen (77 K) to improve the photoluminescence from the fingerprints, but this did not eliminate the coloured pattern. By tilting the filter used to observe the photoluminescence, however, it was possible to find a filter position which significantly reduced the light from the pattern printed on the deposit slip and enabled the fingerprints to be seen clearly (and to be photographed) .
  • the series of photographs of Figure 5 show the image of part of a bank deposit slip on which there is a latent fingerprint.
  • the first photograph of the series is the image of the ninhydrin treated, cadmium complexed, print under white light illumination (the region of the fingerprint has been marked by a line). Little ridge detail of the print is seen in this photograph.
  • the other eight photographs are of the images of the fingerprint when the deposit slip was illuminated with light of a wavelength that caused the treated fingerprint and part of the printing on the deposit slip to photoluminesce at almost the same wavelength.
  • the angle of rotation (tilt) of the interference filter is shown under each photograph.
  • the best ridge detail of the fingerprint is observed with the filter tilted at 30 and 35 , when the photoluminescence from the printing on the deposit slip is mainly, and almost ' totally, suppressed.
  • an object bearing a latent fingerprint was cooled to 77 K and the filter was tilted to find a position of fair definition of the fingerprints.
  • the object was then allowed to warm up continuously to room temperature while the location of the prints was observed with a television camera and recorded on a video tape.
  • a record of the fingerprints at different times was made. Because the photoluminescing compounds have differing photoluminescent efficiencies at different temperatures, there was a temperature at which the ridge detail of the fingerprint was optimised relative to the background. Observation of the display of the video tape enabled the record at the optimum performance temperature to be easily selected.
  • a ninhydrin treated latent fingerprint on a bank deposit slip was examined using monochromatic light.
  • the monochromatic light was the light from a xenon arc lamp transmitted through a planar barrier interference filter positioned between the lamp and the deposit slip.
  • the light reflected from the deposit slip was observed.
  • the bank deposit slip appeared to the observer as a uniformly illunimated background surface, on which dark patterns of the printing on the slip and the fingerprint were visible.
  • the printing pattern obscured the details of the fingerprint.
  • tilting the interference filter a position of the filter was found where the light transmitted through the filter had a wavelength which was precisely the reflected wavelength of the printing on the deposit slip.
  • the printed pattern of the bank deposit slip merged with the background reflected light to show a uniformly illuminated surface with the fingerprint pattern appearing as a dark (light-absorbing) pattern. Photographs were taken of this dark fingerprint pattern. A change of only 5 nanometres in the peak transmitted wavelength of the filter was sufficient to re-introduce the dark pattern of the printing on the deposit slip and to obscure, again, the fingerprint details.
  • any suitable illuminating wavelength, illuminating light source, recording device and interference filter may be used, and that modifications to the technique and apparatus may be made without departing from the inventive concept.

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  • Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Engineering & Computer Science (AREA)
  • General Health & Medical Sciences (AREA)
  • Electromagnetism (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Theoretical Computer Science (AREA)
  • Computer Vision & Pattern Recognition (AREA)
  • Artificial Intelligence (AREA)
  • Toxicology (AREA)
  • Pathology (AREA)
  • Heart & Thoracic Surgery (AREA)
  • Surgery (AREA)
  • Veterinary Medicine (AREA)
  • Nuclear Medicine, Radiotherapy & Molecular Imaging (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • Animal Behavior & Ethology (AREA)
  • Immunology (AREA)
  • Public Health (AREA)
  • Molecular Biology (AREA)
  • Medical Informatics (AREA)
  • Biomedical Technology (AREA)
  • Biophysics (AREA)
  • Image Input (AREA)
  • Measurement Of The Respiration, Hearing Ability, Form, And Blood Characteristics Of Living Organisms (AREA)
  • Investigating Materials By The Use Of Optical Means Adapted For Particular Applications (AREA)

Abstract

Dans les sciences légales, il peut être nécessaire de distinguer entre deux sources photoluminescentes qui émettent un rayonnement à des longueurs d'ondes similaires mais différentes ou de discriminer la lumière réfléchie par les régions d'une surface qui réfléchissent la lumière à des longueurs d'ondes de caractéristiques différentes. Des encres sur des documents et des empreintes digitales latentes traitées sont des exemples de telles sources ou de telles surfaces. Les techniques de l'art antérieur qui permettent de distinguer de telles sources ou de telles régions nécessitent l'utilisation systèmatique d'un grand nombre de filtres d'interférences à bande passante étroite. La présente invention utilise un seul filtre d'interférences (17, 14) qui est incliné pour permettre la modification de la longueur d'onde du rayonnement maximum émis par le filtre. Si des sources photoluminescentes doivent être distinguées, le filtre peut être placé entre les sources et un moniteur (10) contrôlant le rayonnement qu'elles émettent ou entre une lampe éclairante (13) et lesdites sources. On choisit un angle d'inclinaison du filtre permettant le rejet du rayonnement provenant d'au moins une source, pendant que l'intensité du rayonnement provenant d'une source désirée est optimisée. Si une surface réfléchissante doit être distinguée, le filtre inclinable (14) est positionné entre une lampe éclairante (13) et les surfaces, et on détermine un angle d'inclinaison permettant d'établir l'égalité entre la longueur d'onde de la lumière éclairante et la longueur d'onde réfléchissante caractéristique d'une surface non désirée, de telle sorte que, pour un observateur, la surface non désirée se mêle au fond.
EP19870905927 1986-08-27 1987-08-27 Procede et appareil permettant de distinguer des surfaces photoluminescentes et reflechissantes dans des applications du domaine des sciences legales. Withdrawn EP0278976A4 (fr)

Applications Claiming Priority (2)

Application Number Priority Date Filing Date Title
AU7689/86 1986-08-27
AUPH768986 1986-08-27

Publications (2)

Publication Number Publication Date
EP0278976A1 true EP0278976A1 (fr) 1988-08-24
EP0278976A4 EP0278976A4 (fr) 1990-02-05

Family

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Family Applications (1)

Application Number Title Priority Date Filing Date
EP19870905927 Withdrawn EP0278976A4 (fr) 1986-08-27 1987-08-27 Procede et appareil permettant de distinguer des surfaces photoluminescentes et reflechissantes dans des applications du domaine des sciences legales.

Country Status (4)

Country Link
EP (1) EP0278976A4 (fr)
JP (1) JPH01501175A (fr)
AU (1) AU585466B2 (fr)
WO (1) WO1988001730A1 (fr)

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FR2711823B1 (fr) * 1993-10-29 1995-12-22 Cee Procédé de relevé d'empreintes digitales et dispositif pour sa mise en Óoeuvre.
EP1150106A1 (fr) * 2000-04-27 2001-10-31 Krieg, Gunther, Prof.Dr.Ing. Procédé et dispositif pour une analyse quantitative précise de matières dans des liquides, gaz et solides
JP3741051B2 (ja) * 2001-05-10 2006-02-01 横河電機株式会社 バイオチップ読取装置
GB0812926D0 (en) * 2008-07-15 2008-08-20 Assaymetrics Ltd Spectrometer and method of operating a spectrometer
JP5870540B2 (ja) * 2011-08-15 2016-03-01 セイコーエプソン株式会社 画像記録装置、及び、照射器
US9371555B2 (en) 2012-06-01 2016-06-21 Concordia Laboratories Inc. Lighting systems and methods of using lighting systems for in vitro potency assay for photofrin
CN107582067B (zh) * 2017-09-04 2021-09-24 苏州晓松科技开发有限公司 一种用于显现人体皮肤表面生物物证痕迹的生物荧光显现剂及显现方法
DE102020216541A1 (de) * 2020-12-23 2022-06-23 Robert Bosch Gesellschaft mit beschränkter Haftung Vorrichtung und Verfahren für eine Fluoreszenzmessung für eine Analyse einer biochemischen Probe

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Also Published As

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AU7918487A (en) 1988-03-24
JPH01501175A (ja) 1989-04-20
AU585466B2 (en) 1989-06-15
WO1988001730A1 (fr) 1988-03-10
EP0278976A4 (fr) 1990-02-05

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