Abstract
AbstractThe fiber-optic hydrophone is an advanced detection method for modern naval anti-submarine warfare and underwater weapon testing, mainly used to detect marine acoustic environments. The phase generated carrier (PGC) demodulation technology is widely applied in interferometric fiber-optic hydrophones because of its wide dynamic range, high sensitivity, and high phase measurement accuracy. An ellipse fitting optimization method based on least squares is proposed in this paper to solve the nonlinear error in the PGC demodulation process to improve the system demodulation accuracy. The experimental results show that compared with the previous demodulation, after using the least-squares ellipse fitting optimization, the relative amplitude and harmonic suppression ratio of the same frequency are greatly improved, and the demodulation accuracy is effectively enhanced.KeywordsFiber-optic hydrophonePGC demodulationNonlinear optimizationEllipse fitting
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