Anti-wave demodulation method for acousto-optic coupling fiber hydrophones on the water surface
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Corresponding author:
JIN Xiaofeng, jinxf00@zju.edu.cn
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Received Date:
2014-03-31
Accepted Date:
2014-04-02
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Abstract
A novel method was put forward to weaken the signal fading phenomenon of an acousto-optic coupling fiber optic hydrophone on the water surface when the water fluctuates. The method compensated the signal amplitude by detecting the light intensity of the signal arm. The amendment process of demodulation signal was analysed in theory and bynumerical simulation. A fiber optic hydrophone system based on /2 phase demodulation technique was constructed to test the water constant vibration signal. The results show that, compared with the original demodulation signal, the amplitude of the amended signal is stabilized and increased by 5dB wholly. The distortion degree is reduced, the phase noise is suppressed, the signal to noise ratio is improved and the time range of the identifiable signal is extended to 3.5 times. This method can overcome the signal fading phenomenon caused by surface fluctuation effectively, optimize the signal quality and enhance the ability of anti-wave demodulation for the system.
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