【摘要】 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1 550.35¹ 553.14 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（2¹50 Hz）,动态分辨率为0.08 pm/（Hz）^1/2,动态范围为50⁶0 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。更多还原

【Abstract】 In the interrogation system designed for seismic sensing,the parameter control of long period fiber grating（LPFG） during fabrication is discussed,and the LPFG is employed as a linear edge filter because of its high slope efficiency of 0.998 96 from 1 550.35 nm to 1 553.14 nm and power sensitivity of 1.692 dBm/nm.The background noise is eliminated by comparing the reference signal with the filtered signal.LabVIEW is used as processing function module to acquire and analyze data.The sensitivity of detecting wavelength can reach over 1.13 pm/mV（2-150 Hz in frequency domain）,the dynamic range is 50-60 dB,and the resolution can reach 0.08 pm/Hz)^1/2.The results show that this interrogation system has high sensitivity,good stability,and fast speed,and it can be used for seismic exploration.更多还原