Measurement of distributed strain and load identification using 1500 mm gauge length FBG and optical frequency domain reflectometry

Hirotaka Igawa; Hideaki Murayama; Toshiya Nakamura; Isao Yamaguchi; Kazuro Kageyama; Kiyoshi Uzawa; Daichi Wada; Isamu Ohsawa; Makoto Kanai; Koji Omichi

doi:10.1117/12.834236

5 October 2009 Measurement of distributed strain and load identification using 1500 mm gauge length FBG and optical frequency domain reflectometry

Hirotaka Igawa, Hideaki Murayama, Toshiya Nakamura, Isao Yamaguchi, Kazuro Kageyama, Kiyoshi Uzawa, Daichi Wada, Isamu Ohsawa, Makoto Kanai, Koji Omichi

Author Affiliations +

Proceedings Volume 7503, 20th International Conference on Optical Fibre Sensors; 75035I (2009) https://doi.org/10.1117/12.834236
Event: 20th International Conference on Optical Fibre Sensors, 2009, Edinburgh, United Kingdom

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.

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Hirotaka Igawa, Hideaki Murayama, Toshiya Nakamura, Isao Yamaguchi, Kazuro Kageyama, Kiyoshi Uzawa, Daichi Wada, Isamu Ohsawa, Makoto Kanai, and Koji Omichi "Measurement of distributed strain and load identification using 1500 mm gauge length FBG and optical frequency domain reflectometry", Proc. SPIE 7503, 20th International Conference on Optical Fibre Sensors, 75035I (5 October 2009); https://doi.org/10.1117/12.834236

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