Measurements of strain distributions with a long gauge FBG sensor using optical frequency domain reflectometry

H. Igawa; H. Murayama; T. Kasai; I. Yamaguchi; K. Kageyama; K. Ohta

doi:10.1117/12.624250

23 May 2005 Measurements of strain distributions with a long gauge FBG sensor using optical frequency domain reflectometry

H. Igawa, H. Murayama, T. Kasai, I. Yamaguchi, K. Kageyama, K. Ohta

Author Affiliations +

Proceedings Volume 5855, 17th International Conference on Optical Fibre Sensors; (2005) https://doi.org/10.1117/12.624250
Event: 17th International Conference on Optical Fibre Sensors, 2005, Bruges, Belgium

Abstract

We developed a strain measurement system based on optical frequency domain reflectometry and applied it to measuring strain distributions of a specimen in tensile tests. In the sensing region on the specimen, five FBG sensors of 6 mm gauge length or one of 100 mm gauge length was bonded and strain measurements were implemented with both configurations. By using the former configuration, we could successfully carry out accurate quasi-distributed strain measurements. The later allowed fully-distributed measurements for 100 mm at the high spatial resolution. Such performance of high resolution sensing can be applied to health monitoring of a structure which may have stress concentration. In this paper, we describe the principle of the measurement system and the results in the tensile tests.

Citation Download Citation

H. Igawa, H. Murayama, T. Kasai, I. Yamaguchi, K. Kageyama, and K. Ohta "Measurements of strain distributions with a long gauge FBG sensor using optical frequency domain reflectometry", Proc. SPIE 5855, 17th International Conference on Optical Fibre Sensors, (23 May 2005); https://doi.org/10.1117/12.624250

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