Manufacturing of Long-term Pore Water Pressure Monitoring System with Optical Fiber Sensor

Hirata, Yoichi*; Yoshida, Yukimi*

JNC TJ7440 2005-085, 25 Pages, 2003/03

JNC-TJ7440-2005-085.PDF:2.49MB

Long-term monitoring system for the underground water is needed as one of the important method to understand characteristic of hydro-geology. To measure long-term pore water pressure, we manufactured the pore water pressure monitoring system with optical fiber sensors which have long term stability and durability, On this job, we producted a new type monitoring system which has two identified zone for measuring water pressure and temperature.This system is divided in two parts by the sense of installed place. The down-hole part is composed of the packer units, temperature and pressure measuring units and optical fiber jointing units. The surface part is composed of observation and data-saving equipment.The specification is as following* Measurement method: FBG (Fiber Bragg Grating)* Measurement contents: Pressure and Temperature* Range: 0-10 kgf/cm(0-1MPa)* Accuracy: plus mimus 0.5%FS* Borehole diameter: from fai 86 to fai 100 millimeterThis system was installed at the DH-5 bore-hole.

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PNC TJ1439 98-001, 69 Pages, 1998/03

PNC-TJ1439-98-001.pdf:2.43MB

no abstracts in English

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Hirata, Yoichi*; Shikano, Koji*; Hidaka, Kazuhiro*

JNC TJ7440 2005-064, 94 Pages, 1989/06

JNC-TJ7440-2005-064.pdf:13.04MB

no abstracts in English