Direct static-strain measurement utilizing signal fading and spectrum analysis in a fiber optic interferometric sensor

Venkatapura S. Sudarshanam; Richard O. Claus

doi:10.1117/12.147989

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12 July 1993 Direct static-strain measurement utilizing signal fading and spectrum analysis in a fiber optic interferometric sensor

Venkatapura S. Sudarshanam, Richard O. Claus

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Proceedings Volume 1918, Smart Structures and Materials 1993: Smart Sensing, Processing, and Instrumentation; (1993) https://doi.org/10.1117/12.147989
Event: 1993 North American Conference on Smart Structures and Materials, 1993, Albuquerque, NM, United States

Abstract

A highly accurate linear method of static phase shift measurement based on the concurrent utilization of signal fading, a tan^-1 algorithm and photovoltage spectrum analysis in a fiber optic interferometric strain sensor is presented. The static phase shift is superimposed on a controlled dynamic phase modulation derived from an optical phase modulator in one arm of the interferometer. Good agreement is demonstrated between the phase shift obtained through experiment and that from the theoretical analysis based on 1/f noise. This detection scheme has wide applications to static and dynamic phase shift measurements in fiber optic interferometric sensors used in several smart structure configurations.

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Venkatapura S. Sudarshanam and Richard O. Claus "Direct static-strain measurement utilizing signal fading and spectrum analysis in a fiber optic interferometric sensor", Proc. SPIE 1918, Smart Structures and Materials 1993: Smart Sensing, Processing, and Instrumentation, (12 July 1993); https://doi.org/10.1117/12.147989

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