Distributed FMCW reflectometric optical fiber strain sensor

Leong Keey Seah; Pei Chin Won

doi:10.1117/12.427012

8 May 2001 Distributed FMCW reflectometric optical fiber strain sensor

Leong Keey Seah, Pei Chin Won

Proceedings Volume 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001); (2001) https://doi.org/10.1117/12.427012
Event: Optical Engineering for Sensing and Nanotechnology (ICOSN '01), 2001, Yokohama, Japan

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.

Citation Download Citation

Leong Keey Seah and Pei Chin Won "Distributed FMCW reflectometric optical fiber strain sensor", Proc. SPIE 4416, Optical Engineering for Sensing and Nanotechnology (ICOSN 2001), (8 May 2001); https://doi.org/10.1117/12.427012

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