JPS56157833A - Detecting method of leakage of low-temperature fluid - Google Patents

Detecting method of leakage of low-temperature fluid

Info

Publication number
JPS56157833A
JPS56157833A JP6000680A JP6000680A JPS56157833A JP S56157833 A JPS56157833 A JP S56157833A JP 6000680 A JP6000680 A JP 6000680A JP 6000680 A JP6000680 A JP 6000680A JP S56157833 A JPS56157833 A JP S56157833A
Authority
JP
Japan
Prior art keywords
optical fiber
light
low
temperature
alarm
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.)
Granted
Application number
JP6000680A
Other languages
Japanese (ja)
Other versions
JPS6315539B2 (en
Inventor
Masaya Tanaka
Morihiko Kawabe
Namio Kaneko
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.)
IHI Corp
Original Assignee
IHI Corp
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 IHI Corp filed Critical IHI Corp
Priority to JP6000680A priority Critical patent/JPS56157833A/en
Publication of JPS56157833A publication Critical patent/JPS56157833A/en
Publication of JPS6315539B2 publication Critical patent/JPS6315539B2/ja
Granted legal-status Critical Current

Links

Classifications

    • G—PHYSICS
    • G01—MEASURING; TESTING
    • G01M—TESTING STATIC OR DYNAMIC BALANCE OF MACHINES OR STRUCTURES; TESTING OF STRUCTURES OR APPARATUS, NOT OTHERWISE PROVIDED FOR
    • G01M3/00—Investigating fluid-tightness of structures
    • G01M3/02—Investigating fluid-tightness of structures by using fluid or vacuum
    • G01M3/04—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point
    • G01M3/042—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by using materials which expand, contract, disintegrate, or decompose in contact with a fluid
    • G01M3/045—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by using materials which expand, contract, disintegrate, or decompose in contact with a fluid with electrical detection means
    • G01M3/047—Investigating fluid-tightness of structures by using fluid or vacuum by detecting the presence of fluid at the leakage point by using materials which expand, contract, disintegrate, or decompose in contact with a fluid with electrical detection means with photo-electrical detection means, e.g. using optical fibres

Abstract

PURPOSE:To detect the leakage of a low-temperature fluid by employing an optical fiber whose light-transmitting capability attenuates at low temperature. CONSTITUTION:An optical fiber 1 as a sensor is made of a silicon 2 cladded silica glass core 3 and laid around a storing equipment for a liquid to be stored at low temperature. A light beam is applied to the optical fiber 1 from a light-emitting element 4, received by means of a light-receiving element 5, amplified by means of an amplifier 6 and compared with the preset value in a comparator 7. When it is less than the preset value, an alarm is sounded from an alarm device 8. At ordinary temperatures, the optical fiber 1 sufficiently transmits the light beam. However, when the ambient temperature of the laid position is lowered by that the low-temperature liquid having leaked contacts with the fiber 1 or vaporizes, the light- transmitting capability of the optical fiber 1 remarkably attenuates. Accordingly, an alarm is sounded from the alarm device 8.
JP6000680A 1980-05-08 1980-05-08 Detecting method of leakage of low-temperature fluid Granted JPS56157833A (en)

Priority Applications (1)

Application Number Priority Date Filing Date Title
JP6000680A JPS56157833A (en) 1980-05-08 1980-05-08 Detecting method of leakage of low-temperature fluid

Applications Claiming Priority (1)

Application Number Priority Date Filing Date Title
JP6000680A JPS56157833A (en) 1980-05-08 1980-05-08 Detecting method of leakage of low-temperature fluid

Publications (2)

Publication Number Publication Date
JPS56157833A true JPS56157833A (en) 1981-12-05
JPS6315539B2 JPS6315539B2 (en) 1988-04-05

Family

ID=13129563

Family Applications (1)

Application Number Title Priority Date Filing Date
JP6000680A Granted JPS56157833A (en) 1980-05-08 1980-05-08 Detecting method of leakage of low-temperature fluid

Country Status (1)

Country Link
JP (1) JPS56157833A (en)

Cited By (3)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5746138A (en) * 1980-09-05 1982-03-16 Fujitsu Ltd Low-temperature gas sensor
JPS57113329A (en) * 1980-12-29 1982-07-14 Osaka Gas Co Ltd Optical fiber sensor system
EP0555846A2 (en) * 1992-02-13 1993-08-18 Fujikura Ltd. Fluid pipes with temperature abnormality location detecting structure

Cited By (5)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
JPS5746138A (en) * 1980-09-05 1982-03-16 Fujitsu Ltd Low-temperature gas sensor
JPH0126015B2 (en) * 1980-09-05 1989-05-22 Fujitsu Ltd
JPS57113329A (en) * 1980-12-29 1982-07-14 Osaka Gas Co Ltd Optical fiber sensor system
EP0555846A2 (en) * 1992-02-13 1993-08-18 Fujikura Ltd. Fluid pipes with temperature abnormality location detecting structure
US5308162A (en) * 1992-02-13 1994-05-03 Fujikura Ltd. Temperature abnormality detecting structure for fluid pipe

Also Published As

Publication number Publication date
JPS6315539B2 (en) 1988-04-05

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