JPS562536A - Gas leakage detecting method - Google Patents

Gas leakage detecting method

Info

Publication number
JPS562536A
JPS562536A JP7858679A JP7858679A JPS562536A JP S562536 A JPS562536 A JP S562536A JP 7858679 A JP7858679 A JP 7858679A JP 7858679 A JP7858679 A JP 7858679A JP S562536 A JPS562536 A JP S562536A
Authority
JP
Japan
Prior art keywords
gas
light
air
photodetector
34mum
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
JP7858679A
Other languages
Japanese (ja)
Inventor
Yutaka Ohata
Koichi Mikoshiba
Sadaji Hongo
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 JP7858679A priority Critical patent/JPS562536A/en
Publication of JPS562536A publication Critical patent/JPS562536A/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., leaking at the normal temperature without wrong information by emitting infrared light of specific wavelength from a light source, by detecting it by a photodetector, and then by detecting the gas that resides in a gas stay space between the both. CONSTITUTION:Light from LED emitting monochromatic light of 34mum or light source 1 emitting white light, etc., including a wavelength range of 34mum passes through air penetration hole 5, where surrounding air is sucked, by pump 4 and then passes through a gas stay space, where air including gas is reserved, before reaching photodetector 3 consisting of a light-voltage converting element such as a thermistor. When gas is included in the sucked air, light of wavelength according with the gas is absorbed and the light reaches photodetector 3. According to the absorptivity of the light, photodetector 3 detects the density of the gas in the air. Consequently, fine gas of low density can be detected.
JP7858679A 1979-06-21 1979-06-21 Gas leakage detecting method Pending JPS562536A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP7858679A JPS562536A (en) 1979-06-21 1979-06-21 Gas leakage detecting method

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP7858679A JPS562536A (en) 1979-06-21 1979-06-21 Gas leakage detecting method

Publications (1)

Publication Number Publication Date
JPS562536A true JPS562536A (en) 1981-01-12

Family

ID=13666006

Family Applications (1)

Application Number Title Priority Date Filing Date
JP7858679A Pending JPS562536A (en) 1979-06-21 1979-06-21 Gas leakage detecting method

Country Status (1)

Country Link
JP (1) JPS562536A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5170057A (en) * 1992-02-18 1992-12-08 Danielson Associates, Inc. Method and apparatus for measuring the partial pressure of a gas in a vacuum
JP2015516062A (en) * 2012-05-02 2015-06-04 ヴィルコ・アーゲー How to detect propellant gas
JP2017015736A (en) * 2016-10-19 2017-01-19 ヴィルコ・アーゲー Method for detecting a propellant gas

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
US5170057A (en) * 1992-02-18 1992-12-08 Danielson Associates, Inc. Method and apparatus for measuring the partial pressure of a gas in a vacuum
JP2015516062A (en) * 2012-05-02 2015-06-04 ヴィルコ・アーゲー How to detect propellant gas
JP2017015736A (en) * 2016-10-19 2017-01-19 ヴィルコ・アーゲー Method for detecting a propellant gas

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