Frequency response of a polarization-maintaining optical fiber interferometer for simultaneous measurement of strain and temperature

Bornain Chiu; Mardi C. Hastings

doi:10.1117/12.216817

18 August 1995 Frequency response of a polarization-maintaining optical fiber interferometer for simultaneous measurement of strain and temperature

Bornain Chiu, Mardi C. Hastings

Author Affiliations +

Proceedings Volume 2622, Optical Engineering Midwest '95; (1995) https://doi.org/10.1117/12.216817
Event: Optical Engineering Midwest '95, 1995, Chicago, IL, United States

Abstract

Two different demodulation schemes, heterodyne and passive homodyne, were used to determine the frequency response of a polarization-maintaining (PM) optical fiber Mach- Zehnder interferometer for simultaneous measurement of axial strain and temperature. A symmetric 3 by 3 coupler was used to construct the passive homodyne configuration. The heterodyne setup consisted of two acousto-optically modulated lightwaves combined in a 2 by 1 PM fiber coupler. The intensity output of the coupler was demodulated using a digital lock- in amplifier. For a sensing fiber length of 0.54 meters, the frequency response to an axial load was flat up to 2 kHz. A simple rigid rod model of the fiber was developed to estimate the dynamic response.

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Bornain Chiu and Mardi C. Hastings "Frequency response of a polarization-maintaining optical fiber interferometer for simultaneous measurement of strain and temperature", Proc. SPIE 2622, Optical Engineering Midwest '95, (18 August 1995); https://doi.org/10.1117/12.216817

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