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Simulation and hardware implementation of demodulation for fiber optic seismic sensor with linear edge filtering method

机译：具有线性边缘滤波方法光纤地震传感器解调的仿真与硬件实现

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摘要

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 similar 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.
机译：解调系统是地震勘探的一个非常关键的组成部分，其确定了检测系统的数据采集的响应速度和准确性。在这里，我们展示了基于光纤地震传感器线性边缘滤波方法的解调系统的仿真和硬件实现。该系统主要由边缘滤波器（长周期光纤光栅）实现，线性斜率为1.368dbm / nm，边带宽为6.05nm，以及自制电路板。结果表明，该系统可用于解调低频（10Hz-200 Hz）振动信号，最佳的信噪比高达70dB。而且，理论上，系统可用于解调更高的频率振动，并且可以适用于任何振动测量，并且由于结构简单，成本低，性能稳定，快速响应，高精度快，响应速度快，响应速度快，响应速度快，响应速度快，响应速度快，响应速度快，响应速度快，精度高，适用于工程应用。

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