GB1390227A - Method of and apparatus for determining the concentration of gases by optical extinction measurement - Google Patents

Method of and apparatus for determining the concentration of gases by optical extinction measurement

Info

Publication number
GB1390227A
GB1390227A GB2833872A GB2833872A GB1390227A GB 1390227 A GB1390227 A GB 1390227A GB 2833872 A GB2833872 A GB 2833872A GB 2833872 A GB2833872 A GB 2833872A GB 1390227 A GB1390227 A GB 1390227A
Authority
GB
United Kingdom
Prior art keywords
photo
cell
concentration
june
beams
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
GB2833872A
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.)
Individual
Original Assignee
Individual
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 Individual filed Critical Individual
Publication of GB1390227A publication Critical patent/GB1390227A/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

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

1390227 Photo-electric gas analysis E SICK 16 June 1972 [18 June 1971] 28338/72 Heading G 1A In an apparatus for the absorption analysis of a gaseous mixture, e.g. flue gases in a chimney 13, in which a beam-splitter 12 provides measuring (31) and reference (14) beams from a light source 11, a plurality of beam-splitters 15, 16 and photocells 20-22 are provided, each photo-cell only receiving radiation within a predetermined wavelength range so that its output is indicative of the concentration of a particular component. Wavelength selection is achieved either with filters 23-25 or using dichroic mirrors as the beamsplitters 15, 16. Each photo-cell thereby receives a measuring beam, which has travelled through the gas twice, and a reference beam at its appropriate wavelength. To distinguish between the two beams 14, 31 they are chopped at different frequencies by a rotating disc 27 having two series of holes of different pitches. Each photo-cell output is converted to log. form and supplied to an analog computing circuit, Fig.2 (not shown) which calculates the concentrations of the various components.
GB2833872A 1971-06-18 1972-06-16 Method of and apparatus for determining the concentration of gases by optical extinction measurement Expired GB1390227A (en)

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
DE19712130331 DE2130331C3 (en) 1971-06-18 1971-06-18 Method and device for determining the concentrations of the components of a mixture consisting of two gases and smoke

Publications (1)

Publication Number Publication Date
GB1390227A true GB1390227A (en) 1975-04-09

Family

ID=5811150

Family Applications (1)

Application Number Title Priority Date Filing Date
GB2833872A Expired GB1390227A (en) 1971-06-18 1972-06-16 Method of and apparatus for determining the concentration of gases by optical extinction measurement

Country Status (5)

Country Link
CH (1) CH551622A (en)
DE (1) DE2130331C3 (en)
FR (1) FR2142525A5 (en)
GB (1) GB1390227A (en)
IT (1) IT956679B (en)

Cited By (1)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2584341A1 (en) * 2011-10-18 2013-04-24 The Boeing Company Airborne impurities detection

Families Citing this family (12)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
DE2521934C3 (en) 1975-05-16 1978-11-02 Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch Device for determining the concentrations of components in an exhaust gas mixture
DE2559806C3 (en) * 1975-05-16 1985-12-12 Erwin Sick Gmbh Optik-Elektronik, 7808 Waldkirch Device for determining the concentration of components of an exhaust gas mixture consisting of various gases and possibly smoke particles
DE2723939C2 (en) * 1977-05-24 1983-01-05 Hans-Jörg Dr.rer.nat. 8520 Erlangen Albrecht Device for respiratory gas analysis
NL94317C (en) * 1978-11-29
GB2057680A (en) * 1979-08-29 1981-04-01 Econics Corp Electro-optical flue gas analyzer
FR2474166A1 (en) * 1980-01-23 1981-07-24 Commissariat Energie Atomique PHOTOMETRIC MEASURING DEVICE FOR VARIABLE BACKGROUND NOISE COMPLEX SOLUTIONS
DE3541165A1 (en) * 1985-11-21 1987-05-27 Hellige Gmbh DEVICE FOR CONTINUOUSLY DETERMINING CONCENTRATION CHANGES IN MIXTURES
US10925515B2 (en) 2014-05-22 2021-02-23 Picomole Inc. Alveolar breath collection apparatus
CA2998026A1 (en) 2017-03-13 2018-09-13 Picomole Inc. Apparatus and method of optimizing laser system
US11035789B2 (en) 2019-04-03 2021-06-15 Picomole Inc. Cavity ring-down spectroscopy system and method of modulating a light beam therein
US11782049B2 (en) 2020-02-28 2023-10-10 Picomole Inc. Apparatus and method for collecting a breath sample using a container with controllable volume
US11957450B2 (en) 2020-02-28 2024-04-16 Picomole Inc. Apparatus and method for collecting a breath sample using an air circulation system

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
EP2584341A1 (en) * 2011-10-18 2013-04-24 The Boeing Company Airborne impurities detection
CN103115871A (en) * 2011-10-18 2013-05-22 波音公司 Airborne impurities detection
US8899097B2 (en) 2011-10-18 2014-12-02 The Boeing Company Airborne impurities detection

Also Published As

Publication number Publication date
FR2142525A5 (en) 1973-01-26
DE2130331C3 (en) 1978-06-29
DE2130331B2 (en) 1977-03-17
IT956679B (en) 1973-10-10
DE2130331A1 (en) 1972-12-21
CH551622A (en) 1974-07-15

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Legal Events

Date Code Title Description
PS Patent sealed
PLE Entries relating assignments, transmissions, licences in the register of patents
PCNP Patent ceased through non-payment of renewal fee