JPS57100338A - Monitoring system for gas - Google Patents

Monitoring system for gas

Info

Publication number
JPS57100338A
JPS57100338A JP17822980A JP17822980A JPS57100338A JP S57100338 A JPS57100338 A JP S57100338A JP 17822980 A JP17822980 A JP 17822980A JP 17822980 A JP17822980 A JP 17822980A JP S57100338 A JPS57100338 A JP S57100338A
Authority
JP
Japan
Prior art keywords
laser beam
gas
area
absorption
ceiling
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.)
Pending
Application number
JP17822980A
Other languages
Japanese (ja)
Inventor
Kouji Shinohara
Takeshi Akamatsu
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.)
Fujitsu Ltd
Original Assignee
Fujitsu 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 Fujitsu Ltd filed Critical Fujitsu Ltd
Priority to JP17822980A priority Critical patent/JPS57100338A/en
Publication of JPS57100338A publication Critical patent/JPS57100338A/en
Pending 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
    • G01N21/39—Investigating relative effect of material at wavelengths characteristic of specific elements or molecules, e.g. atomic absorption spectrometry using tunable lasers

Landscapes

  • Physics & Mathematics (AREA)
  • Spectroscopy & Molecular Physics (AREA)
  • Analytical Chemistry (AREA)
  • Health & Medical Sciences (AREA)
  • Life Sciences & Earth Sciences (AREA)
  • Chemical & Material Sciences (AREA)
  • Optics & Photonics (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

PURPOSE:To monitor an area to be monitored of a semiclosed space extending over a comparatively wide range by a single laser beam passage, by passing the laser beam through the area to be monitored and detecting the variation of absorbed quantity of infrared rays of this laser beam. CONSTITUTION:Infrared rays laser beam radiatin means 11, 21 and photodetection means 12, 22, are provided in the neighborhood of the ceiling of the area to be detected of semiclosed space such as an underground market 2 established in a part of underground 1 or a building 4. The wavelength of light radiated from the means 11, 21 is selected so as to be socalled nu3 absorption band of absorption length by methane. when the combustible or explosive gas G is floated nearby the ceiling, the laser beam is passed through the gas G and is absorbed in accordance with the concentration of the gas G. The variation of this quantity of absorption is detected by a spectroscopic analyzing apparatus connected to the means 12, 22. Hereby, the existence of gaseous methane is measured in a moment and the main cock of the gas is shut automatically and also, forced discharge can be carried out.
JP17822980A 1980-12-15 1980-12-15 Monitoring system for gas Pending JPS57100338A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP17822980A JPS57100338A (en) 1980-12-15 1980-12-15 Monitoring system for gas

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP17822980A JPS57100338A (en) 1980-12-15 1980-12-15 Monitoring system for gas

Publications (1)

Publication Number Publication Date
JPS57100338A true JPS57100338A (en) 1982-06-22

Family

ID=16044844

Family Applications (1)

Application Number Title Priority Date Filing Date
JP17822980A Pending JPS57100338A (en) 1980-12-15 1980-12-15 Monitoring system for gas

Country Status (1)

Country Link
JP (1) JPS57100338A (en)

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5459324A (en) * 1993-12-10 1995-10-17 Sextant Avionique Method and apparatus for the optical measurement of the pressure of a gaseous mixture
WO2014037399A1 (en) * 2012-09-04 2014-03-13 Abb Technology Ag Device and method for monitoring rooms equipped with high-voltage apparatuses

Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4924096A (en) * 1972-06-24 1974-03-04
JPS5461587A (en) * 1977-10-25 1979-05-17 Fujitsu Ltd Gas analyzer using ultrared ray

Patent Citations (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS4924096A (en) * 1972-06-24 1974-03-04
JPS5461587A (en) * 1977-10-25 1979-05-17 Fujitsu Ltd Gas analyzer using ultrared ray

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5459324A (en) * 1993-12-10 1995-10-17 Sextant Avionique Method and apparatus for the optical measurement of the pressure of a gaseous mixture
WO2014037399A1 (en) * 2012-09-04 2014-03-13 Abb Technology Ag Device and method for monitoring rooms equipped with high-voltage apparatuses
US9513204B2 (en) 2012-09-04 2016-12-06 Abb Technology Ag Device and method for monitoring rooms equipped with high-voltage apparatuses

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