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提出了一种新型的光纤布拉格光栅(FBG)水声传感探头结构以及光纤光栅传感信号的自解调方法。利用一对匹配光栅构成推挽结构,实现了传感-解调的合二为一,大大地减小了系统的复杂度;并通过筒状弹性体结构,解决了裸光纤光栅测量水声信号的灵敏度过小的问题,并具有温度补偿作用。仿真与初步实验结果表明,该水听器探头的测量动态范围超过100 dB,在100~200 dB re 1μPa的水声压范围内,测量灵敏度为0.36 nm/Mpa。
A novel fiber Bragg grating (FBG) acoustic sensing probe structure and a self-demodulation method of FBG sensing signal are proposed. By using a pair of matching gratings to form a push-pull structure, the combination of sensing and demodulation is realized, the complexity of the system is greatly reduced, and the underwater fiber grating measurement of the underwater acoustic signal Sensitivity is too small, and has a temperature compensation. The simulation and preliminary experimental results show that the hydrophone probe has a dynamic range of more than 100 dB and the measurement sensitivity is 0.36 nm / Mpa at a water pressure of 100 ~ 200 dB re 1μPa.