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Proceedings Paper

Application of fiber optic distributed sensor for strain measurement in civil engineering
Author(s): Toshio Kurashima; Tomonori Usu; Kuniaki Tanaka; Atsushi Nobiki; Masashi Sato; Kenji Nakai
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Paper Abstract

We report on civil engineering applications of a fiber optic distributed strain sensor. It consists of a sensing fiber and a high performance optical time domain reflectometer (OTDR), for measuring both strain and optical loss distribution along optical fibers by accessing only one end of the fiber. The OTDR can measure distributed strain with an accuracy of better than +/- 60 X 10-6 and a high spatial resolution of up to 1 m over a 10 km long fiber. In model experiments using the OTDR, we measured the strain changes in fibers attached to the surface of a concrete test beam. The performance of the fiber strain sensor was tested by measuring the strain distribution in optical fibers and comparing the results with resistance strain gage measurements for several loads. We found that the two sets of results were similar, and in addition, we demonstrated experimentally that the sensor was able to measure an induced strain change of less than 100 by 10-6, which is nearly the elastic limit of the concrete material. These results show the potential of the OTDR to extend the application of monitoring systems to such areas as large building diagnostics for civil engineering.

Paper Details

Date Published: 14 November 1997
PDF: 12 pages
Proc. SPIE 3241, Smart Materials, Structures, and Integrated Systems, (14 November 1997); doi: 10.1117/12.293504
Show Author Affiliations
Toshio Kurashima, NTT Access Network Systems Labs. (Japan)
Tomonori Usu, NTT Access Network Systems Labs. (Japan)
Kuniaki Tanaka, NTT Access Network Systems Labs. (Japan)
Atsushi Nobiki, NTT Access Network Systems Labs. (Japan)
Masashi Sato, Civil Engineering Research Institute (Japan)
Kenji Nakai, Civil Engineering Research Institute (Japan)

Published in SPIE Proceedings Vol. 3241:
Smart Materials, Structures, and Integrated Systems
Alex Hariz; Vijay K. Varadan; Olaf Reinhold, Editor(s)

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