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Proceedings Paper

Development of borehole multiple deformation sensor system
Author(s): Yoshio Kashiwai; Shuji Daimaru; Hiroyuki Sanada; Hiroya Matsui
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Paper Abstract

The multiple deformation sensor system for small diameter borehole is required for the long term monitoring of deformation of rock mass of high-level radioactive waste disposal site. The conventional electric monitoring systems are difficult to apply for a long term monitoring in many cases because of the sensor failure caused by lowering of insulation or other problems and only available for the large borehole and for 6 or less measurement sections. The Borehole Multiple Deformation Sensor System was developed based on the FBG (Fiber Bragg Grating) sensor technology that is expected to have longer life time than electric systems. The developed system can be set in a 66 mm diameter borehole and available for 9 or more measurement sections that can be hardly achieved by electric systems. The sensor system is applying for the monitoring of ground deformation in the Horonobe Underground Research Laboratory in Japan.

Paper Details

Date Published: 16 May 2008
PDF: 4 pages
Proc. SPIE 7004, 19th International Conference on Optical Fibre Sensors, 70041P (16 May 2008); doi: 10.1117/12.785814
Show Author Affiliations
Yoshio Kashiwai, Taisei Kiso Sekkei Co., Ltd. (Japan)
Shuji Daimaru, Taisei Kiso Sekkei Co., Ltd. (Japan)
Hiroyuki Sanada, Japan Atomic Energy Agency (Japan)
Hiroya Matsui, Japan Atomic Energy Agency (Japan)

Published in SPIE Proceedings Vol. 7004:
19th International Conference on Optical Fibre Sensors
David Sampson; Stephen Collins; Kyunghwan Oh; Ryozo Yamauchi, Editor(s)

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