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Proceedings Paper

Distributed FMCW reflectometric optical fiber strain sensor
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Paper Abstract

This paper describes a new quasi-distributed optical fiber strain sensor which is based on the coherent frequency- modulated continuous-wave (FMCW) reflectometry technique. The sensor comprises a laser diode and an unbalanced two- beam interferometer. Its test arm consists of a number of single-mode fibers, which act as the sensing fibers, with a mirror at the far end and mechanical splices as the connectors, as well as the reflectors. Theoretical analysis shows that the measuring resolution of the strain is inversely proportional to the gauge length of each sensing fiber. The strain variation of each sensing fiber can be measured by demodulating the phase shifts of the beat signals using a heterodyne signal processing system. To calibrate and verify the feasibility and accuracy of this sensing system, tensile and bending tests were carried out and their results were calculated and compared with the readings from strain gauge. Experimental results showed that this system is feasible and it has an excellent accuracy.

Paper Details

Date Published: 8 May 2001
PDF: 4 pages
Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); doi: 10.1117/12.427012
Show Author Affiliations
Leong Keey Seah, Nanyang Technological Univ. (Singapore)
Pei Chin Won, Nanyang Technological Univ. (Singapore)

Published in SPIE Proceedings Vol. 4416:
Optical Engineering for Sensing and Nanotechnology (ICOSN 2001)
Koichi Iwata, Editor(s)

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