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设计一种针对地震波信号的解调系统,讨论了长周期光纤光栅(LPFG)制作时参数的控制方法,选用边缘特性良好的LPFG做线性边缘滤波器,在1 550.35~1 553.14 nm间具有0.998 96的线性拟合度,功率灵敏度达1.692 dBm/nm。在信号处理中,采用参考光路与滤波光路比较,消除本底信号的影响;利用LabVIEW软件代替部分硬件,并作为信号采集及信号分析处理功能模块,使系统解调检测波长灵敏度达到1.13 pm/mV,在低频段(2~150 Hz),动态分辨率为0.08 pm/(Hz)~(1/2),动态范围为50~60 dB。本文解调系统操作简单、灵敏度高、稳定性好、性价比高且响应速度快,可以用于地震勘探。
A demodulation system for seismic wave signals is designed. The control method of LPFG parameters is discussed. LPFG with good edge characteristics is used as the linear edge filter with 0.998 96 between 1 550.35 and 1 553.14 nm The linearity of the sensitivity, power sensitivity of 1.692 dBm / nm. In the signal processing, the reference light path is compared with the filter light path to eliminate the influence of the background signal. Using LabVIEW software instead of some hardware, and as the signal acquisition and signal analysis processing module, the system demodulation detection wavelength sensitivity of 1.13 pm / mV , The dynamic resolution is 0.08 pm / (Hz) ~ (1/2) in low frequency range (2 ~ 150 Hz) and the dynamic range is 50 ~ 60 dB. This demodulation system is simple, high sensitivity, good stability, cost-effective and fast response, can be used for seismic exploration.