Abstract The demodulation system is a very critical component of the seismic exploration, which determines the response speed and accuracy of data acquisition of the detection system. Here, we demonstrate a simulation and hardware implementation of demodulation system based on linear edge filtering method for fiber optic seismic sensor. The system is implemented mainly by an edge filter (long period fiber grating) with the linear slope of 1.368 dBm/nm and the sideband width of 6.05 nm, and a homemade circuit board. The results show that the system can be used to demodulate low-frequency (10 Hz–200 Hz) vibration signals, and the best signal-to-noise ratio is up to ~ 70 dB. Moreover, theoretically, the system could be used to demodulate higher frequency vibration and can be adapted to any vibration measurement, and suitable for engineering application due to the characteristics of simple structure, low cost, stable performance, fast response speed and high precision.

中文翻译：

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线性边缘滤波法光纤地震传感器解调仿真与硬件实现

摘要 解调系统是地震勘探中非常关键的组成部分，它决定了检测系统的响应速度和数据采集的准确性。在这里，我们展示了基于线性边缘滤波方法的光纤地震传感器解调系统的仿真和硬件实现。该系统主要由线性斜率为1.368 dBm/nm、边带宽度为6.05 nm的边缘滤波器（长周期光纤光栅）和自制电路板实现。结果表明，该系统可用于解调低频（10 Hz-200 Hz）振动信号，最佳信噪比可达~70 dB。此外，从理论上讲，该系统可用于解调更高频率的振动，并可适用于任何振动测量，