JPS562535A - Gas leakage detector using optical fiber - Google Patents

Gas leakage detector using optical fiber

Info

Publication number
JPS562535A
JPS562535A JP7858579A JP7858579A JPS562535A JP S562535 A JPS562535 A JP S562535A JP 7858579 A JP7858579 A JP 7858579A JP 7858579 A JP7858579 A JP 7858579A JP S562535 A JPS562535 A JP S562535A
Authority
JP
Japan
Prior art keywords
optical fiber
light
receiving optical
gas
reflex mirror
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
JP7858579A
Other languages
Japanese (ja)
Inventor
Yutaka Ohata
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.)
Hitachi Cable Ltd
Original Assignee
Hitachi Cable 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 Hitachi Cable Ltd filed Critical Hitachi Cable Ltd
Priority to JP7858579A priority Critical patent/JPS562535A/en
Publication of JPS562535A publication Critical patent/JPS562535A/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
    • G01N21/35—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

Abstract

PURPOSE:To detect propane gas, coal gas, etc., at the normal temperature without wrong information by providing a light source emitting infrared light of specific wavelength, a photodetector detecting it, and a reflex mirror reflecting sent light and then by connecting them by bundles of transmitting and receiving optical fibers. CONSTITUTION:Infrared light from light source 1 such as LED emitting monochromatic light of 34mum in absorption wavelength is made to strike transmitting optical fiber 3 via filter 2. The light is reflected by reflex mirror 4 and then strikes receiving optical fiber 5. The reflected light having propagated through receiving optical fiber 5 strikes photodetector 6 such as a thermistor, which converts it into an electric signal. In this case, when propane gas, coal gas, or the like resides in space 7 extending from the transmitting optical fiber to the receiving optical fiber via the reflex mirror, it is absorbed as much as its density. Consequently, the density of the gas can be detected and further since the optical fibers are used, flexibility is provided, so that detection will be possible at a narrow place.
JP7858579A 1979-06-21 1979-06-21 Gas leakage detector using optical fiber Pending JPS562535A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7858579A JPS562535A (en) 1979-06-21 1979-06-21 Gas leakage detector using optical fiber

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7858579A JPS562535A (en) 1979-06-21 1979-06-21 Gas leakage detector using optical fiber

Publications (1)

Publication Number Publication Date
JPS562535A true JPS562535A (en) 1981-01-12

Family

ID=13665979

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7858579A Pending JPS562535A (en) 1979-06-21 1979-06-21 Gas leakage detector using optical fiber

Country Status (1)

Country Link
JP (1) JPS562535A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4567366A (en) * 1982-09-25 1986-01-28 Showa Denko Kabushiki Kaisha Method and apparatus for measuring methane concentration in gas
US5892229A (en) * 1996-04-22 1999-04-06 Rosemount Analytical Inc. Method and apparatus for measuring vaporous hydrogen peroxide
CN104132898A (en) * 2014-06-11 2014-11-05 中国南方电网有限责任公司超高压输电公司贵阳局 Optical fiber sensing device for online monitoring of gas in oil of oil-filled equipment

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US4567366A (en) * 1982-09-25 1986-01-28 Showa Denko Kabushiki Kaisha Method and apparatus for measuring methane concentration in gas
US5892229A (en) * 1996-04-22 1999-04-06 Rosemount Analytical Inc. Method and apparatus for measuring vaporous hydrogen peroxide
CN104132898A (en) * 2014-06-11 2014-11-05 中国南方电网有限责任公司超高压输电公司贵阳局 Optical fiber sensing device for online monitoring of gas in oil of oil-filled equipment

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