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Vol.9 No.2previous AASP17 (125-126-127-128-129-130-131-132-133-134-135-136-137-138-139-140-141-142) NT85

Academic Articles
Regular Paper Vol.9 No.2 (2017) p.52 - p.59
 

Thermal Management of Heat Resistant FBG Sensing for High Temperature Industrial Plants

 
Akihiko NISHIMURA1,*, Yusuke TAKENAKA2, Akinori FURUSAWA1, Kazuhiro TORIMOTO1, Masashi UEDA3, Naoaki FUKUDA4 and Kazuyuki HIRAO5
 

1Applied Laser Technology Institute, Japan Atomic Energy Agency, 65-20, Kizaki, Tsuruga, Fukui, 914-8585, Japan
2 A-tech Co., Ltd., 2-11-7, Funaishikawa-Ekinishi, Tokai, Ibaraki, 319-1116, Japan
3 Monju Project Management and Engineering Center, Japan Atomic Energy Agency, 2-1, Shiraki, Tsuruga, Fukui, 919-1279, Japan
4 Office of Society-Academia Collaboration for Innovation, Kyoto Univ., 1-30, Goryo-Ohara, Nishikyo-ku, Kyoto, 615-8245, Japan
5 Fac. of Eng. and Nano-Technology Hub, Kyoto Univ., Yoshida-Honmachi, Sakyoku-ku, Kyoto, 606-8501, Japan

 
Abstract
Fiber Bragg Gratings (FBG) were fabricated by use of point by point method using precisely focused picosecond laser pulses, The FBGs can be the best candidate for strain gauge for high temperature industrial plants. For the best use of heat resistant characteristic, we demonstrated to embed the FBG sensors in metal mold to an elbow in the sodium loop. Metal adhesive is made of fine silver particles. This adhesive is applicable at very high temperature, having a high thermal conductivity and being activated in strength at 200℃. A sodium loop was constructed to develop maintenance technologies for liquid sodium handling. The main tank was filled with liquid sodium of 6 ton. Sodium was circulated with temperature of ~500℃, the flow speed of 5 m/s. In daily operation, the FBGs successfully detect periodic distortion at the elbow due to the thermal expansion. During emergency cooling, a sudden shrinking of the loop was recorded. We propose to apply FBGs to an advanced remote monitoring system for high temperature industrial plants.
 
Keywords
fiber Bragg grating, laser processing, sodium, pipeline, thermal management, structural integrity, heat resistant, high temperature, industrial plants, monitoring, remote sensing
 
Full Paper: PDF
Article Information
Article history:
Received 12 October 2016
Accepted 29 May 2017