GB902732A - Improvements in or relating to absorptiometers - Google Patents

Improvements in or relating to absorptiometers

Info

Publication number
GB902732A
GB902732A GB3530458A GB3530458A GB902732A GB 902732 A GB902732 A GB 902732A GB 3530458 A GB3530458 A GB 3530458A GB 3530458 A GB3530458 A GB 3530458A GB 902732 A GB902732 A GB 902732A
Authority
GB
United Kingdom
Prior art keywords
signal
filter
absorption
photo
standardizing
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
GB3530458A
Inventor
Colin David Reid
Alec Donald Street
Daniel Fraser Davidson
Stanley Alexander Dean
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.)
UK Atomic Energy Authority
Original Assignee
UK Atomic Energy Authority
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
Priority to NL247343D priority Critical patent/NL247343A/xx
Priority to GB2848557A priority patent/GB896736A/en
Application filed by UK Atomic Energy Authority filed Critical UK Atomic Energy Authority
Priority to GB3530458A priority patent/GB902732A/en
Priority to DE1959U0006640 priority patent/DE1159184B/en
Priority to FR811522A priority patent/FR1241612A/en
Publication of GB902732A publication Critical patent/GB902732A/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
    • G01J3/12—Generating the spectrum; Monochromators
    • 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
    • G01J2003/123—Indexed discrete filters
    • 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)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

902,732. Infra-red fluid analysis. UNITED KINGDOM ATOMIC ENERGY AUTHORITY. Nov. 3, 1959 [Nov. 4, 1958; Feb. 17, 1959; May 14, 1959], Nos. 35304/58, 5525/59 and 16570/59. Class 40 (3). In infra-red gas analysis apparatus differing wavebands of light pass through an absorbtion tube sequentially and repeatedly to a detector, the output of which is an absorption signal at one frequency and a standardizing signal at a second frequency, means being provided to compare said signals. In the light beam between a source 1 (Fig. 1 of the second Provisional Specification), and an absorption tube 6 are a chopper 3 interrupting the light beam at 1000 c/s. and a narrow band filter 5 rocked to and fro at 2 c/s. The output of the photo-cell 7 is therefore a 1000 c/s carrier signal modulated at 2 c/s by the filter 5. On demodulation a D.C. voltage proportional to the carrier signal controls the photo-cell voltage to eliminate spurious intensity variations. Filter 5 may be replaced by two band-pass filters transversely oscillated alternately into and out of the light beam. In a second embodiment the filter and chopper are replaced by a compound filter (Fig. 2 of the first Provisional Specification). Sections S transmit a wavelength which is absorbed by the test gas and sections R and T transmit wavelengths not absorbed. Thus absorption and standardizing signals, at different frequencies, emanate from the photo-cell. The standardizing signal is fed to the slide wire of a self-balancing potentiometer to the signal input of which is applied the absorption signal, or alternatively controls the gain of an absorption signal amplifier.
GB3530458A 1957-09-10 1958-11-04 Improvements in or relating to absorptiometers Expired GB902732A (en)

Priority Applications (5)

Application Number Priority Date Filing Date Title
NL247343D NL247343A (en) 1958-11-04
GB2848557A GB896736A (en) 1957-09-10 1957-09-10 Improvements in or relating to absorptiometers
GB3530458A GB902732A (en) 1958-11-04 1958-11-04 Improvements in or relating to absorptiometers
DE1959U0006640 DE1159184B (en) 1958-11-04 1959-11-13 Devices for displaying the concentration of a gas or a liquid in a mixture by measuring radiation absorption
FR811522A FR1241612A (en) 1958-11-04 1959-11-27 Absorptiometers

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB3530458A GB902732A (en) 1958-11-04 1958-11-04 Improvements in or relating to absorptiometers

Publications (1)

Publication Number Publication Date
GB902732A true GB902732A (en) 1962-08-09

Family

ID=10376199

Family Applications (1)

Application Number Title Priority Date Filing Date
GB3530458A Expired GB902732A (en) 1957-09-10 1958-11-04 Improvements in or relating to absorptiometers

Country Status (4)

Country Link
DE (1) DE1159184B (en)
FR (1) FR1241612A (en)
GB (1) GB902732A (en)
NL (1) NL247343A (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050823A (en) * 1974-09-05 1977-09-27 Dragerwerk Aktiengesellschaft Apparatus for continuously measuring the CO2 content in breathing gases

Families Citing this family (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
NL280130A (en) * 1961-06-26
US4010368A (en) * 1974-04-23 1977-03-01 Autoscan, Inc. Test apparatus
DE2530480A1 (en) * 1975-07-09 1977-01-27 Bayer Ag SINGLE-BEAM PHOTOMETER

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4050823A (en) * 1974-09-05 1977-09-27 Dragerwerk Aktiengesellschaft Apparatus for continuously measuring the CO2 content in breathing gases

Also Published As

Publication number Publication date
NL247343A (en)
DE1159184B (en) 1963-12-12
FR1241612A (en) 1960-09-16

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