A demodulation method with high stability for interferometric type vector fiber hydrophone

Qingkai Hou; Fuyin Wang; Qiong Yao; Shuidong Xiong

doi:10.1117/12.2525724

21 June 2019 A demodulation method with high stability for interferometric type vector fiber hydrophone

Qingkai Hou, Fuyin Wang, Qiong Yao, Shuidong Xiong

Proceedings Volume 11056, Optical Measurement Systems for Industrial Inspection XI; 110563U (2019) https://doi.org/10.1117/12.2525724
Event: SPIE Optical Metrology, 2019, Munich, Germany

Abstract

Signal detection stability is very important for vector fiber-optic hydrophone and hydrophone array, because the instability of the demodulated signal directly leads to the target azimuth estimation error and the degradation of system performance. In this paper, a method to achieve high-stability signal demodulation for interferometric vector fiber-optic hydrophone is studied. A parameter estimation and demodulation parameter compensation method for phase generated carrier demodulation system is proposed based on elliptic curve parameter fitting algorithm. An elliptic curve is constructed using the second and third frequency of the reference interference signal. The ellipse curve fitting algorithm is introduced to estimate the distortion parameter of the modulation and demodulation system by fitting the value of each elliptic curve parameter. By compensating the PGC demodulation for the tested signal with the estimated parameters, the instability of demodulation system caused by PGC modulation depth variation and additional modulation intensity of the light source can be effectively reduced. The feasibility of the method is verified by simulation experiments and actual system experiments. High stability signal detection is realized using the proposed method, which can effectively improves the detection effect of the vector fiber-optic hydrophone array.

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Qingkai Hou, Fuyin Wang, Qiong Yao, and Shuidong Xiong "A demodulation method with high stability for interferometric type vector fiber hydrophone", Proc. SPIE 11056, Optical Measurement Systems for Industrial Inspection XI, 110563U (21 June 2019); https://doi.org/10.1117/12.2525724

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KEYWORDS

Demodulation

Modulation

Signal detection

Fiber optics

Phase shift keying

Interferometry

Interferometers

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