GB930698A - Improvements in and relating to apparatus for the analysis of substances by absorption of infra-red radiation - Google Patents

Improvements in and relating to apparatus for the analysis of substances by absorption of infra-red radiation

Info

Publication number
GB930698A
GB930698A GB967761A GB967761A GB930698A GB 930698 A GB930698 A GB 930698A GB 967761 A GB967761 A GB 967761A GB 967761 A GB967761 A GB 967761A GB 930698 A GB930698 A GB 930698A
Authority
GB
United Kingdom
Prior art keywords
disc
absorption
sample
coated
radiation
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
GB967761A
Inventor
Albert Edward Martin
Ronald Haswell
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.)
Sir Howard Grubb Parsons and Co Ltd
Original Assignee
Sir Howard Grubb Parsons and Co Ltd
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 Sir Howard Grubb Parsons and Co Ltd filed Critical Sir Howard Grubb Parsons and Co Ltd
Priority to GB967761A priority Critical patent/GB930698A/en
Publication of GB930698A publication Critical patent/GB930698A/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
    • G01N21/35—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using infrared light
    • 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
    • G01J2003/1226—Interference 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
    • G01J3/28—Investigating the spectrum
    • G01J3/42—Absorption spectrometry; Double beam spectrometry; Flicker spectrometry; Reflection spectrometry
    • G01J3/433—Modulation spectrometry; Derivative spectrometry
    • G01J2003/4332—Modulation spectrometry; Derivative spectrometry frequency-modulated
    • 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)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Analytical Chemistry (AREA)
  • Biochemistry (AREA)
  • General Health & Medical Sciences (AREA)
  • General Physics & Mathematics (AREA)
  • Immunology (AREA)
  • Pathology (AREA)
  • Investigating Or Analysing Materials By Optical Means (AREA)

Abstract

930,698. Infra-red fluid analysis. Sir HOWARD GRUBB PARSONS & CO. Ltd. April 16, 1962 [March 16, 1961], No. 9677/61. Class 40 (3). The invention relates to apparatus for the analysis of substances by absorption of infrared radiation and comprises an infra-red source 1, a cell 2 for containing a sample under test, an infra-red detector 3, for example a thermocouple or an indium antimonide cell, which receives the radiation from the source 1 via the cell 2, an optical filter 5 in the radiation path for passing a desired wavelength region in which the sample has appreciable absorption and a rotatable disc of material 6 transparent to at least a portion of the radiation transmitted by the filter, the disc being coated or covered over a portion of its area (Figs. 1a and 1b, not shown) such that the said portion has absorption bands or interference fringes overlapping the region of absorption of the sample so that when the disc is rotated an alternating signal is produced by the detector which is related to the absorption characteristics of the sample. With the cell empty, Fig. 2a shows by curve A the spectral distribution received by the detector 3 when the radiation is passing through a transparent sector of the disc and by-curve B the spectral distribution received by the detector when the radiation is passing through a coated sector of the disc. Fig. 2b shows the curve c obtained with a sample in the cell when the sample has an absorption band nearly coincident with that of the coated sector D. With the disc rotating the difference in the absorption of the sample and the coated sector of the disc as shown by curves C and D produces an alternating signal at the detector which is amplified by an amplifier 8 and fed to an output meter 9 or pen recorder which gives an indication of the concentration of the particular substance under investigation in the sample. The apparatus may be used for the investigation of substances having a substantially uniformly-spaced set of vibrationrotation absorption bands in which case the diso is made of material e.g. mica which produces regularly-spaced interference fringes with transmission troughs between the fringes coinciding with the rotation bands of the substance under investigation and the coated sectors of the disc are coated on one or both sides with material e.g. zinc sulphide of higher refractive index than the material of the disc.
GB967761A 1961-03-16 1961-03-16 Improvements in and relating to apparatus for the analysis of substances by absorption of infra-red radiation Expired GB930698A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
GB967761A GB930698A (en) 1961-03-16 1961-03-16 Improvements in and relating to apparatus for the analysis of substances by absorption of infra-red radiation

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
GB967761A GB930698A (en) 1961-03-16 1961-03-16 Improvements in and relating to apparatus for the analysis of substances by absorption of infra-red radiation

Publications (1)

Publication Number Publication Date
GB930698A true GB930698A (en) 1963-07-10

Family

ID=9876627

Family Applications (1)

Application Number Title Priority Date Filing Date
GB967761A Expired GB930698A (en) 1961-03-16 1961-03-16 Improvements in and relating to apparatus for the analysis of substances by absorption of infra-red radiation

Country Status (1)

Country Link
GB (1) GB930698A (en)

Cited By (4)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3744918A (en) * 1970-04-30 1973-07-10 Aga Ab Apparatus for correlation spectroscopy
DE10036948A1 (en) * 2000-07-28 2002-02-21 Abb Patent Gmbh Measuring nitrogen oxides concentration involves using specific discharge lamp in which electrically rotating filtering or screen wheel is placed in radiation path and controlled
DE102004028433A1 (en) * 2004-06-14 2006-01-05 Danfoss A/S IR sensor, especially CO2 sensor
CN111921575A (en) * 2014-12-23 2020-11-13 特斯托欧洲股份两合公司 Analysis method, disc-shaped sample carrier and use of a sample carrier

Cited By (7)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US3744918A (en) * 1970-04-30 1973-07-10 Aga Ab Apparatus for correlation spectroscopy
DE10036948A1 (en) * 2000-07-28 2002-02-21 Abb Patent Gmbh Measuring nitrogen oxides concentration involves using specific discharge lamp in which electrically rotating filtering or screen wheel is placed in radiation path and controlled
DE102004028433A1 (en) * 2004-06-14 2006-01-05 Danfoss A/S IR sensor, especially CO2 sensor
DE102004028433B4 (en) * 2004-06-14 2006-08-31 Danfoss A/S IR sensor, especially CO2 sensor
US7635845B2 (en) 2004-06-14 2009-12-22 Danfoss A/S IR sensor, especially a CO2 sensor
CN111921575A (en) * 2014-12-23 2020-11-13 特斯托欧洲股份两合公司 Analysis method, disc-shaped sample carrier and use of a sample carrier
CN111921575B (en) * 2014-12-23 2022-04-12 特斯托欧洲股份两合公司 Analysis method, disc-shaped sample carrier and use of a sample carrier

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