FMCW reflectometric optical fiber strain sensor

Pei Chin Won; Leong Keey Seah; Anand Krishna Asundi

doi:10.1117/12.429574

13 June 2001 FMCW reflectometric optical fiber strain sensor

Pei Chin Won, Leong Keey Seah, Anand Krishna Asundi

Proceedings Volume 4317, Second International Conference on Experimental Mechanics; (2001) https://doi.org/10.1117/12.429574
Event: Second International Conference on Experimental Mechanics, 2000, Singapore, Singapore

Abstract

This paper presents analysis and simulation results describing the feasibility of a modified distributed optical fiber strain sensor whose principle of operation is based on the frequency-modulated continuous-wave reflectometry technique. The sensor consists of a frequency-swept laser diode and an unbalanced two-beam interferometer. In this system, the test arm comprises a number of single-mode fibers, which at as the sensing fibers, with a mirror at the far end and mechanical splices as the connectors, as well as the reflectors. The strain variation of the sensing fiber is measured by demodulating the phase shift of the beat signal using a heterodyne signal processing system, and therefore the requirement of a high precision temperature control of light source can be eliminated in this way. The measuring resolution of ht strain was found to be inversly proportional to the optical path difference between the reference are and the test arm. Experimental results showed that the theoretical value and accuracy were achieved.

Citation Download Citation

Pei Chin Won, Leong Keey Seah, and Anand Krishna Asundi "FMCW reflectometric optical fiber strain sensor", Proc. SPIE 4317, Second International Conference on Experimental Mechanics, (13 June 2001); https://doi.org/10.1117/12.429574

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