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在传统压电水听器相位一致性测试的基础上提出了分布反馈(DFB)光纤激光水听器相位一致性的测试方法,并搭建了测试系统。采用偏振无关的非平衡迈克尔逊干涉仪和归一化的相位载波(PGC)解调方案,解调出光纤激光水听器感受的水声信号,并与参考压电水听器作对比,使用高精度相位检测器将两信号转化为相位差信号;重复测量第二支光纤激光水听器;将两个相位差值作比较即可得到光纤激光水听器的相位一致性。实验证明了测试系统的稳定性;同时对光纤激光水听器的相位一致性进行了测试和分析,证明了光纤激光水听器具有很高的相位一致性。
Based on the phase consistency test of traditional piezoelectric hydrophone, a method to test the phase consistency of DFB fiber laser hydrophone is proposed and a test system is set up. Polarization-independent unbalanced Michelson interferometer and normalized phase carrier (PGC) demodulation scheme are used to demodulate the underwater acoustic signals perceived by optical fiber laser hydrophone. Compared with the reference piezoelectric hydrophone, The high-precision phase detector converts the two signals into a phase difference signal; the second fiber laser hydrophone is repeatedly measured; and the phase consistency of the fiber laser hydrophone can be obtained by comparing the two phase differences. The stability of the test system was proved by the experiment. At the same time, the phase consistency of the fiber laser hydrophone was tested and analyzed, which proves that the fiber laser hydrophone has high phase consistency.