A novel fiber optic interferometer of hydrophone based on Mach-Zehnder hybrid configuration

Mao-Hsiung Chen; Kang-Shien Chiang; Wuu-wun Lin; Han-Yang Chen; Shu-Xuan Liu

doi:10.1117/12.662628

22 April 2006 A novel fiber optic interferometer of hydrophone based on Mach-Zehnder hybrid configuration

Mao-Hsiung Chen, Kang-Shien Chiang, Wuu-wun Lin, Han-Yang Chen, Shu-Xuan Liu

Proceedings Volume 6189, Optical Sensing II; 618923 (2006) https://doi.org/10.1117/12.662628
Event: SPIE Photonics Europe, 2006, Strasbourg, France

Abstract

We report on the development of a new type of hydrophone based on an optical fiber interferometer sensor. This interferometer based on dual Sagnac ring configuration to pick up the underwater acoustic signal. Using the unbalanced arms of the Mach-Zehnder interferometer (MZI), the underwater acoustic wave induces the phase difference on optic fiber hydrophone interrogator to demodulate the acoustic field signals by PGC modulation circuit. The configuration is easily implemented and can detect weak signal in a high noisy water environment. The underwater hydrophone systems primarily with B&K system, projector 8104 and receiver 8103, have been successfully worked. As well, B&K 8104 acoustic response increases with frequency but also causes the echo noise in the meantime. The experimental results show that over the frequency range of 7 to 11 KHz, the hydrophone has an almost flat response with an average sensitivity and dynamic range of -211.47 dB re/μPa and 33dB, respectively.

Citation Download Citation

Mao-Hsiung Chen, Kang-Shien Chiang, Wuu-wun Lin, Han-Yang Chen, and Shu-Xuan Liu "A novel fiber optic interferometer of hydrophone based on Mach-Zehnder hybrid configuration", Proc. SPIE 6189, Optical Sensing II, 618923 (22 April 2006); https://doi.org/10.1117/12.662628

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KEYWORDS

Acoustics

Signal detection

Interferometers

Ferroelectric materials

Modulators

Optical fibers

Sensors

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