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Optical Engineering

Characteristics of a fiber-optical Fabry–Perot interferometric acoustic sensor based on an improved phase-generated carrier-demodulation mechanism
Author(s): Xuefeng Mao; Xiaoran Tian; Xinlei Zhou; Qingxu Yu
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Paper Abstract

The characteristics of a fiber-optic Fabry–Perot interferometric acoustic sensor are investigated. An improved phase-generator carrier-demodulation mechanism is proposed for obtaining a high harmonic suppression ratio and stability of the demodulation results. A gold-coated polyethylene terephthalate membrane is used as the sensing diaphragm. By optimizing the parameters and the demodulation algorithm, the signal-to-noise ratio (SNR) and distortion ratio of 50.3 dB and the total harmonic distortion of 0.1% at 114 dB sound pressure level (SPL) (@ 1 kHz) are achieved, respectively. The sensor shows good temperature stability; the variation of the response is within 0.6 dB as the temperature changes from −10°C to 50°C. A sensitivity of 40  mV/Pa at 1 kHz and a frequency response range of 100 Hz to 12.5 kHz are reached, respectively. The SNR of the system is 60 dB (Re. 94 dB SPL). The sensor may be applied to photoacoustic spectrometers as a high-performance acoustic sensor.

Paper Details

Date Published: 20 April 2015
PDF: 6 pages
Opt. Eng. 54(4) 046107 doi: 10.1117/1.OE.54.4.046107
Published in: Optical Engineering Volume 54, Issue 4
Show Author Affiliations
Xuefeng Mao, Dalian Univ. of Technology (China)
Xiaoran Tian, Columbia Univ. (United States)
Xinlei Zhou, Dalian Univ. of Technology (China)
Qingxu Yu, Dalian Univ. of Technology (China)

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