High Sensitivity and High Stability Dual Fabry-Perot Interferometric Fiber-Optic Acoustic Sensor Based on Sandwich-Structure Composite Diaphragm

Wanjin Zhang; Ping Lu; Zhiyuan Qu; Pingjie Fan; Chaotan Sima; Deming Liu; Jiangshan Zhang

doi:10.1109/JPHOT.2021.3057666

IEEE Photonics Journal (Jan 2021)

High Sensitivity and High Stability Dual Fabry-Perot Interferometric Fiber-Optic Acoustic Sensor Based on Sandwich-Structure Composite Diaphragm

Wanjin Zhang,
Ping Lu,
Zhiyuan Qu,
Pingjie Fan,
Chaotan Sima,
Deming Liu,
Jiangshan Zhang

Affiliations

Wanjin Zhang: ORCiD; National Engineering Laboratory for Next Generation Internet Access Systems, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
Ping Lu: ORCiD; National Engineering Laboratory for Next Generation Internet Access Systems, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
Zhiyuan Qu: National Engineering Laboratory for Next Generation Internet Access Systems, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
Pingjie Fan: National Engineering Laboratory for Next Generation Internet Access Systems, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
Chaotan Sima: ORCiD; National Engineering Laboratory for Next Generation Internet Access Systems, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
Deming Liu: National Engineering Laboratory for Next Generation Internet Access Systems, School of Optical and Electronic Information, Huazhong University of Science and Technology, Wuhan, China
Jiangshan Zhang: Department of Electronics and Information Engineering, Huazhong University of Science and Technology, Wuhan, China

DOI: https://doi.org/10.1109/JPHOT.2021.3057666
Journal volume & issue: Vol. 13, no. 2
pp. 1 – 13

Abstract

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A dual Fabry-Perot (FP) interferometric fiber-optic acoustic sensor based on sandwich-structure composite diaphragm is proposed, where fixed phase difference is generated by two FP interferometers (FPIs) with different cavity length. An ellipse fitting differential cross multiplication (EF-DCM) interrogation process is applied for phase demodulation to overcome drawbacks of quadrature point based intensity demodulation, such as temperature drifting, optical power jitter and limited dynamic range. Besides, benefiting from the large area sandwich-structure composite diaphragm, high sensitivity and wide flat frequency response are obtained. Experimental results show that phase sensitivity is -121.11 dB re 1 rad/μPa@250 Hz and sensitivity fluctuation is below 0.8 dB between 2-250Hz. To prove the high stability of the demodulation system, acoustic signal test is performed at different wavelength and different optical power and a fluctuation below 3% is observed. Moreover, profiting from the dual FP sensor structure, the acoustic sensor is get rid of influence of temperature drifting which usually leads to variation of cavity length of fiber optic acoustic sensor. The proposed sensor structure also overcomes drawbacks of traditional dual wavelength demodulation such as extra noise introduced by erbium doped fiber amplifier (EDFA) and high cost.

Published in IEEE Photonics Journal

ISSN: 1943-0655 (Online)
Publisher: IEEE
Country of publisher: United States
LCC subjects: Technology: Engineering (General). Civil engineering (General): Applied optics. Photonics; Science: Physics: Optics. Light
Website: http://ieeexplore.ieee.org/xpl/RecentIssue.jsp?punumber=4563994

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