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24 October 2017 Fiber optic microphone with large dynamic range based on bi-fiber Fabry-Perot cavity
Jin Cheng, Dan-feng Lu, Ran Gao, Zhi-mei Qi
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Proceedings Volume 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications; 104642C (2017) https://doi.org/10.1117/12.2283009
Event: Applied Optics and Photonics China (AOPC2017), 2017, Beijing, China
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.
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Jin Cheng, Dan-feng Lu, Ran Gao, and Zhi-mei Qi "Fiber optic microphone with large dynamic range based on bi-fiber Fabry-Perot cavity", Proc. SPIE 10464, AOPC 2017: Fiber Optic Sensing and Optical Communications, 104642C (24 October 2017); https://doi.org/10.1117/12.2283009
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KEYWORDS
Fabry–Perot interferometers
Fiber optics
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