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Report No.
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Development of optical fiber displacement sensor for bedrocks (The Third year)

Kashiwai, Yoshio*; Daimaru, Shuji*; Sanada, Hiroyuki; Matsui, Hiroya 

This work was performed by Taisei Kiso Sekkei Co., Ltd. under contract with Japan Atomic Energy Agency. The objective of this work is development of multiple stage optical fiber displacement sensors for the long-term deformation monitoring in rock mass of shafts and horizontal tunnels at the Phase 2 of Horonobe Underground Research project. The field test was done for installation to the borehole drilling in bedrock and continuous observation of one month. A prototype of explosion-proof fusion splice was also made for setting work in the flammable circumstance.

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