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提出了一种基于光源频率调节的干涉型光纤水听器主动相位补偿的信号检测方法。详细介绍了该方法的基本检测原理,对信号解调误差进行了理论分析与仿真。为了验证该方法的可行性,搭建了实验系统,并编写了实时的信号采集、处理程序,对某一干涉型光纤水听器的声压灵敏度进行了测试。在频带20 Hz-1.3 kHz上,平均声压灵敏度为-162.2 dB(0 dB=1 rad/μPa),波动小于±0.8 dB,与采用相位载波调制解调方法测量的结果基本吻合。实验结果证明该方法是有效的。由于传感部分不含有源器件,便于实现全光纤化,且解调算法简单、检测频带宽,该方法能被广泛应用到各种干涉型光纤传感器的信号检测当中。
A signal detection method based on light source frequency adjustment for active phase compensation of interferometric fiber hydrophone is proposed. The basic detection principle of this method is introduced in detail, and the signal demodulation error is theoretically analyzed and simulated. In order to verify the feasibility of the method, an experimental system was set up and a real-time signal acquisition and processing program was compiled. The sound pressure sensitivity of an interference optical fiber hydrophone was tested. The average sound pressure sensitivity is -162.2 dB (0 dB = 1 rad / μPa) over a frequency range of 20 Hz to 1.3 kHz with a fluctuation of less than ± 0.8 dB, which is in good agreement with the results measured by the phase-carrier modulation-demodulation method. Experimental results show that the method is effective. Because the sensing part does not contain active devices, it is easy to realize all-optical fiber, and the demodulation algorithm is simple and the detection frequency band is wide. This method can be widely applied to the signal detection of various interference optical fiber sensors.