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Proceedings Paper

Measurement of distributed strain and load identification using 1500 mm gauge length FBG and optical frequency domain reflectometry
Author(s): Hirotaka Igawa; Hideaki Murayama; Toshiya Nakamura; Isao Yamaguchi; Kazuro Kageyama; Kiyoshi Uzawa; Daichi Wada; Isamu Ohsawa; Makoto Kanai; Koji Omichi
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Paper Abstract

High spatial resolution and sensitivity are required in distributed strain measurements for structural health monitoring. We have developed a distributed strain sensing technique with long gauge FBG sensors, which enables to measure strain at an arbitrary position along the FBG sensors with the high spatial resolution less than 1 mm based on optical frequency domain reflectometry (OFDR). In this paper this technique with a 1500 mm gauge length FBG was applied to monitoring strain distributions of a simply supported beam subjected to bending loads. The agreement between the measured strain and the theoretical one is excellent. Also we succeeded to identify the applied load by the inverse analysis from the measured strain distribution data, and confirmed the validity of these methods.

Paper Details

Date Published: 5 October 2009
PDF: 4 pages
Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75035I (5 October 2009); doi: 10.1117/12.834236
Show Author Affiliations
Hirotaka Igawa, Japan Aerospace Exploration Agency (Japan)
Hideaki Murayama, The Univ. of Tokyo (Japan)
Toshiya Nakamura, Japan Aerospace Exploration Agency (Japan)
Isao Yamaguchi, Japan Aerospace Exploration Agency (Japan)
Kazuro Kageyama, The Univ. of Tokyo (Japan)
Kiyoshi Uzawa, The Univ. of Tokyo (Japan)
Daichi Wada, The Univ. of Tokyo (Japan)
Isamu Ohsawa, The Univ. of Tokyo (Japan)
Makoto Kanai, The Univ. of Tokyo (Japan)
Koji Omichi, Fujikura Ltd. (Japan)

Published in SPIE Proceedings Vol. 7503:
20th International Conference on Optical Fibre Sensors
Julian D. C. Jones, Editor(s)

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