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Proceedings Paper

Fiber optic microphone with large dynamic range based on bi-fiber Fabry-Perot cavity
Author(s): Jin Cheng; Dan-feng Lu; Ran Gao; Zhi-mei Qi
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Paper Abstract

In this paper, we report a fiber optic microphone with a large dynamic range. The probe of microphone consists of bi-fiber Fabry-Perot cavity architecture. The wavelength of the working laser is about 1552.05nm. At this wavelength, the interference spectroscopies of these two fiber Fabry-Perot cavities have a quadrature shift. So the outputs of these two fiber Fabry-Perot sensors are orthogonal signal. By using orthogonal signal demodulation method, this microphone can output a signal of acoustic wave. Due to no relationship between output signal and the linear region on interference spectroscopy, the microphones have a large maximum acoustic pressure above 125dB.

Paper Details

Date Published: 24 October 2017
PDF: 5 pages
Proc. SPIE 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications, 104642C (24 October 2017); doi: 10.1117/12.2283009
Show Author Affiliations
Jin Cheng, Institute of Electronics (China)
Dan-feng Lu, Institute of Electronics (China)
Ran Gao, Institute of Electronics (China)
Zhi-mei Qi, Institute of Electronics (China)

Published in SPIE Proceedings Vol. 10464:
AOPC 2017: Fiber Optic Sensing and Optical Communications
Zi-Sen Zhao; Leping Wei; Yanbiao Liao; Weixu Zhang; Desheng Jiang; Wei Wang; Kenneth T. V. Grattan, Editor(s)

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