OPTICAL FIBER CABLE FOR MEASURING TEMPERATURE OF GEOTHERMAL WELL

Japanese Patent JP2999099

B2

PURPOSE: To prevent damage of metallic pipes and an increase in transmission loss by previously specifying the length of optical fibers at a service environmental temp. to the length of the metallic pipes at the same temp. or below specifying a difference between both to a difference between the inside lengths of the metallic pipes or above.
CONSTITUTION: The optical fibers are previously provided with surplus lengths and are housed slightly long in the metallic pipes at the time of producing the metallic pipe optical fibers. The lengths of the optical fibers 2 at the time of use are specified to the length of the metallic pipes 1 or below to avert stagnating of the optical fibers in the lower part and generating fine bends therein even at the time of perpendicular laying and to avert generating of tension which arises from a difference in the lengths along the inside of the metallic pipes with the positions in the pipe due to spiral disposition of the metallic pipes 1 in formation into a cable of a twisted structure in such a case. The difference between the length along the centers of the metallic pipes 1 and the length along the inside of the metallic pipes 1 when the optical fibers 2 are nearest the central (center of a spiral shape) side of the cable section is confined to the difference between the inside lengths of the metallic pipes.

JPS6245613	DI(METH)ACRYLIC ESTER MIXTURE, RESIN COMPOSITION AND COATING AGENT
JP2007156326	OPTICAL FIBER CABLE

Hideaki Futashima
Yoshikazu Murata
Kenji Watanabe
Koichi Yasuga
Yasuhiro Ogata

JP19791393A

January 17, 2000

July 14, 1993

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Sumitomo Electric Industries, Ltd.
Kyushu Electric Power Co., Inc.

G02B6/44; G02B6/00; (IPC1-7): G02B6/44; G02B6/44; G02B6/00

JP51142334A
JP511035U

Hidemi Aoki (1 outside)

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