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研制了基于时分外差法检测的非对称薄壁壳型光纤一维地震波检波器,该检波器易于扩展为三轴分立式地震波检波器,具有检测动态范围大,易于构成大规模时分复用传感网络的优点。建立了非对称地震波检波器的理论模型,分析了各结构参数对其灵敏度的影响;搭建了基于光学同步参考信号的时分外差法测试系统,进行了外差系统的稳定性测试,测量了地震波检波器的频响曲线,结果表明外差系统测量信号波动小于0.1dB;工作频段20~800Hz内加速度平均灵敏度为28.5dB re rad/g,与理论仿真结果基本吻合。
An asymmetric thin-walled fiber optic one-dimensional seismic wave detector based on time-difference heterodyne method is developed. The detector can be easily extended to a three-axis discrete seismic wave detector with large detection dynamic range and easy to form large-scale time-division multiplexing The advantages of sensor networks. The theoretical model of asymmetric seismic wave detector is established and the influence of each structural parameter on its sensitivity is analyzed. A time-difference heterodyne test system based on optical synchronization reference signal is established, and the stability test of heterodyne system is carried out. The results show that the measurement signal fluctuation of the heterodyne system is less than 0.1 dB. The average sensitivity of acceleration in the frequency band of 20 ~ 800 Hz is 28.5 dB re rad / g, which is in good agreement with the theoretical simulation results.