New digital processing algorithm for determining the direction and magnitude of the strain from quadrature phase-shifted fiber optic signals

Il-Bum Kwon; M. S. Bae; Man-Yong Choi; Hahngue Moon

doi:10.1117/12.316993

21 July 1998 New digital processing algorithm for determining the direction and magnitude of the strain from quadrature phase-shifted fiber optic signals

Il-Bum Kwon, M. S. Bae, Man-Yong Choi, Hahngue Moon

Author Affiliations +

Proceedings Volume 3330, Smart Structures and Materials 1998: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials; (1998) https://doi.org/10.1117/12.316993
Event: 5th Annual International Symposium on Smart Structures and Materials, 1998, San Diego, CA, United States

Abstract

A digital signal processing algorithm, Kwon's method, was developed for strain measurement by a passive quadrature demodulated fiber optic Michelson interferometric sensor. The fiber optic Michelson sensor, which is constructed of a 3 by 3 fiber optic coupler, can give the information about the magnitude and direction of the strain of structures. The beating, drifting, and noise, which are caused by the longitudinal strain and the lateral strain of the fiber, bring about the counting error of the phase differences. Kwon's algorithm is based on the reference line crossing count method and resets the reference line during the presence of the signal drifting. The accuracy of the strain calculation was confirmed by the various simulated fiber optic signals with signal beating, drifting and noise. A passive quadrature demodulated 3 by 3 fiber optic Michelson interferometric sensor was bonded on the cantilevered aluminum beam to experiment the strain sensing. The capability of the real-time processing was verified by the real fiber optic signals.

Citation Download Citation

Il-Bum Kwon, M. S. Bae, Man-Yong Choi, and Hahngue Moon "New digital processing algorithm for determining the direction and magnitude of the strain from quadrature phase-shifted fiber optic signals", Proc. SPIE 3330, Smart Structures and Materials 1998: Sensory Phenomena and Measurement Instrumentation for Smart Structures and Materials, (21 July 1998); https://doi.org/10.1117/12.316993

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