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Sensors 2017, 17(6), 1219;

Corrugated-Diaphragm Based Fiber Laser Hydrophone with Sub-100 μPa/Hz1/2 Resolution

Guangdong Provincial Key Laboratory of Optical Fiber Sensing and Communications, Institute of Photonics Technology, Jinan University, Guangzhou 510632, China
Author to whom correspondence should be addressed.
Academic Editors: George Rodriguez, Joseba Zubia and Paulo S. André
Received: 18 April 2017 / Revised: 16 May 2017 / Accepted: 23 May 2017 / Published: 26 May 2017
(This article belongs to the Special Issue Fiber Bragg Grating Based Sensors)
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In this work, a beat-frequency encoded fiber laser hydrophone is developed for high-resolution acoustic detection by using an elastic corrugated diaphragm. The diaphragm is center-supported by the fiber. Incident acoustic waves deform the diaphragm and induce a concentrated lateral load on the laser cavity. The acoustically induced perturbation changes local optical phases and frequency-modulates the radio-frequency beat signal between two orthogonal lasing modes of the cavity. Theoretical analysis reveals that a higher corrugation-depth/thickness ratio or larger diaphragm area can provide higher transduction efficiency. The experimentally achieved average sensitivity in beat-frequency variation is 185.7 kHz/Pa over a bandwidth of 1 kHz. The detection capability can be enhanced by shortening the cavity length to enhance the signal-to-noise ratio. The minimum detectable acoustic pressure reaches 74 µPa/Hz1/2 at 1 kHz, which is comparable to the zeroth order sea noise. View Full-Text
Keywords: fiber laser sensors; acoustic sensors; fiber optic hydrophones; fiber Bragg grating fiber laser sensors; acoustic sensors; fiber optic hydrophones; fiber Bragg grating

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Yang, W.-Z.; Jin, L.; Liang, Y.-Z.; Ma, J.; Guan, B.-O. Corrugated-Diaphragm Based Fiber Laser Hydrophone with Sub-100 μPa/Hz1/2 Resolution. Sensors 2017, 17, 1219.

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