Lasers, Fiber Optics, and Communications

Characteristics of a fiber-optical Fabry–Perot interferometric acoustic sensor based on an improved phase-generated carrier-demodulation mechanism

[+] Author Affiliations
Xuefeng Mao, Xinlei Zhou, Qingxu Yu

Dalian University of Technology, School of Physics and Optoelectronic Engineering, No. 2 Linggong Road, Dalian 116024, China

Xiaoran Tian

Columbia University, Fu Foundation School of Engineering, 521 West 122nd Street, Apt. 42, New York, New York 10027, United States

Opt. Eng. 54(4), 046107 (Apr 20, 2015). doi:10.1117/1.OE.54.4.046107
History: Received January 24, 2015; Accepted March 23, 2015
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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 40mV/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.

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© 2015 Society of Photo-Optical Instrumentation Engineers

Citation

Xuefeng Mao ; Xiaoran Tian ; Xinlei Zhou and Qingxu Yu
"Characteristics of a fiber-optical Fabry–Perot interferometric acoustic sensor based on an improved phase-generated carrier-demodulation mechanism", Opt. Eng. 54(4), 046107 (Apr 20, 2015). ; http://dx.doi.org/10.1117/1.OE.54.4.046107


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