DE3663307D1 - Blocker device for eliminating specular reflectance from a diffuse reflection spectrum - Google Patents

Blocker device for eliminating specular reflectance from a diffuse reflection spectrum

Info

Publication number
DE3663307D1
DE3663307D1 DE8686301307T DE3663307T DE3663307D1 DE 3663307 D1 DE3663307 D1 DE 3663307D1 DE 8686301307 T DE8686301307 T DE 8686301307T DE 3663307 T DE3663307 T DE 3663307T DE 3663307 D1 DE3663307 D1 DE 3663307D1
Authority
DE
Germany
Prior art keywords
diffuse reflection
reflection spectrum
specular reflectance
blocker device
eliminating specular
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
Application number
DE8686301307T
Other languages
English (en)
Inventor
Robert G Messerschmidt
Donald W Sting
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.)
Spectra Tech Inc
Original Assignee
Spectra Tech Inc
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 Spectra Tech Inc filed Critical Spectra Tech Inc
Application granted granted Critical
Publication of DE3663307D1 publication Critical patent/DE3663307D1/de
Expired legal-status Critical Current

Links

Classifications

    • 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
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N21/474—Details of optical heads therefor, e.g. using optical fibres
    • 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
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/25—Colour; Spectral properties, i.e. comparison of effect of material on the light at two or more different wavelengths or wavelength bands
    • G01N21/31—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • G01N2021/3595—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light using FTIR
    • 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
    • G01N21/17—Systems in which incident light is modified in accordance with the properties of the material investigated
    • G01N21/47—Scattering, i.e. diffuse reflection
    • G01N21/4738—Diffuse reflection, e.g. also for testing fluids, fibrous materials
    • G01N2021/4764—Special kinds of physical applications
    • G01N2021/4769—Fluid samples, e.g. slurries, granulates; Compressible powdery of fibrous samples
DE8686301307T 1985-02-25 1986-02-24 Blocker device for eliminating specular reflectance from a diffuse reflection spectrum Expired DE3663307D1 (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
US06/705,201 US4661706A (en) 1985-02-25 1985-02-25 Blocker device for eliminating specular reflectance from a diffuse reflection spectrum

Publications (1)

Publication Number Publication Date
DE3663307D1 true DE3663307D1 (en) 1989-06-15

Family

ID=24832473

Family Applications (1)

Application Number Title Priority Date Filing Date
DE8686301307T Expired DE3663307D1 (en) 1985-02-25 1986-02-24 Blocker device for eliminating specular reflectance from a diffuse reflection spectrum

Country Status (6)

Country Link
US (1) US4661706A (de)
EP (1) EP0200302B1 (de)
JP (1) JPS61196138A (de)
CN (1) CN86101254A (de)
CA (1) CA1255946A (de)
DE (1) DE3663307D1 (de)

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US7627151B2 (en) * 2003-04-04 2009-12-01 Lumidigm, Inc. Systems and methods for improved biometric feature definition
US7347365B2 (en) * 2003-04-04 2008-03-25 Lumidigm, Inc. Combined total-internal-reflectance and tissue imaging systems and methods
US20050007582A1 (en) * 2003-07-07 2005-01-13 Lumidigm, Inc. Methods and apparatus for collection of optical reference measurements for monolithic sensors
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US7263213B2 (en) 2003-12-11 2007-08-28 Lumidigm, Inc. Methods and systems for estimation of personal characteristics from biometric measurements
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US7508965B2 (en) * 2004-06-01 2009-03-24 Lumidigm, Inc. System and method for robust fingerprint acquisition
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Also Published As

Publication number Publication date
US4661706A (en) 1987-04-28
CN86101254A (zh) 1986-10-22
CA1255946A (en) 1989-06-20
JPS61196138A (ja) 1986-08-30
EP0200302A1 (de) 1986-11-05
EP0200302B1 (de) 1989-05-10

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Legal Events

Date Code Title Description
8328 Change in the person/name/address of the agent

Free format text: FLUEGEL, O., DIPL.-ING., PAT.-ANW., 8000 MUENCHEN

8364 No opposition during term of opposition
8339 Ceased/non-payment of the annual fee