GB1050561A - - Google Patents

Info

Publication number
GB1050561A
GB1050561A GB1050561DA GB1050561A GB 1050561 A GB1050561 A GB 1050561A GB 1050561D A GB1050561D A GB 1050561DA GB 1050561 A GB1050561 A GB 1050561A
Authority
GB
United Kingdom
Prior art keywords
filter
oscillated
incidence
photo
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
Application number
Publication date
Publication of GB1050561A publication Critical patent/GB1050561A/en
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
    • G01N21/25—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
    • G01N21/314—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry with comparison of measurements at specific and non-specific wavelengths
    • 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
    • G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
    • G01J3/433—Modulation spectrometry; Derivative spectrometry
    • 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
    • G01N21/17—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
    • G01N21/3504—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light for analysing gases, e.g. multi-gas analysis

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • General Physics & Mathematics (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Light Guides In General And Applications Therefor (AREA)

Abstract

1,050,561. Photo-electric systems. STANDARD TELEPHONES & CABLES Ltd. April 22, 1964, No. 16655/64. Heading G1A. The light emission of an object such as the sun or a lamp or the transmission of atmospheric vapours at two wavelengths is compared using a photo-cell receiving light through a narrow band interference filter which is oscillated between a position in which the incident light makes a substantial angle of incidence with it and another position in which it makes a small angle of incidence, just sufficient to eliminate undesirable reflections from the filter surfaces. The filter is mounted on a wire suspension and oscillated at the natural frequency of the combination. The different transmissivities of the filter in the two positions is compensated by a waveform generated in synchronism with the oscillation.
GB1050561D Expired GB1050561A (en)

Publications (1)

Publication Number Publication Date
GB1050561A true GB1050561A (en) 1900-01-01

Family

ID=1755862

Family Applications (1)

Application Number Title Priority Date Filing Date
GB1050561D Expired GB1050561A (en)

Country Status (1)

Country Link
GB (1) GB1050561A (en)

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970390A (en) * 1972-11-30 1976-07-20 Trw Inc. Multifrequency laser oscillator for holographic contouring
GB2165641A (en) * 1984-10-13 1986-04-16 Graviner Ltd Measuring distance to a fire
GB2176889A (en) * 1985-06-19 1987-01-07 Graviner Ltd Detecting the presence of gas
US4804271A (en) * 1985-07-04 1989-02-14 Karl Cammann Process for the improvement of selectivity of spectrometric measurements and an apparatus for the performance of the process
US5835200A (en) * 1990-04-24 1998-11-10 Gersan Establishment Method and apparatus for examining an object
EP1150106A1 (en) * 2000-04-27 2001-10-31 Krieg, Gunther, Prof.Dr.Ing. Method and apparatus for precise quantitative material analysis in liquids, gases and solids
US7034936B2 (en) 2002-02-13 2006-04-25 Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Spectrometer

Cited By (8)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3970390A (en) * 1972-11-30 1976-07-20 Trw Inc. Multifrequency laser oscillator for holographic contouring
GB2165641A (en) * 1984-10-13 1986-04-16 Graviner Ltd Measuring distance to a fire
GB2176889A (en) * 1985-06-19 1987-01-07 Graviner Ltd Detecting the presence of gas
US4804271A (en) * 1985-07-04 1989-02-14 Karl Cammann Process for the improvement of selectivity of spectrometric measurements and an apparatus for the performance of the process
US5835200A (en) * 1990-04-24 1998-11-10 Gersan Establishment Method and apparatus for examining an object
EP1150106A1 (en) * 2000-04-27 2001-10-31 Krieg, Gunther, Prof.Dr.Ing. Method and apparatus for precise quantitative material analysis in liquids, gases and solids
US7034936B2 (en) 2002-02-13 2006-04-25 Fraunhofer Gesellschaft Zur Foerderung Der Angewandten Forschung E.V. Spectrometer
EP1474665B1 (en) * 2002-02-13 2006-09-06 Fraunhofer-Gesellschaft Zur Förderung Der Angewandten Forschung E.V. Spectrometer

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