激光技术Issue(1)：1-5,5.DOI:10.7510/jgjs.issn.1001-3806.2015.01.001
水面声光耦合光纤水听器的抗波浪解调方法
Anti-wave demodulation method for acousto-optic coupling fiber hydrophones on the water surface
摘要
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 π/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.关键词
光纤光学/光纤水听器/水声测量/抗波浪解调/π/2相位解调法Key words
fiber optics/fiber optic hydrophone/underwater acoustic measurement/anti-wave demodulation/π/2 phase demodulation method分类
信息技术与安全科学引用本文复制引用
李栋,周金海,瞿柯林,祝艳宏,金晓峰..水面声光耦合光纤水听器的抗波浪解调方法[J].激光技术,2015,(1):1-5,5.基金项目
国家科技支撑计划资助项目 （）
