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提出了一种利用光纤超荧光光源的线性边带做边缘滤波器进行多点多参量实时测量的地震波信号解调系统.由于光源波长检测灵敏度对解调系统的灵敏度起决定作用,故对光源进行了优化设计,使得光源所用的线性段斜率得到了大幅度提高.所设计的解调系统以光源在吸收峰1530nm处的两段斜边将系统分为两个部分,各部分对应4个通道.通过对其中两个通道进行地震检波模拟测量,传感解调系统的两部分静态波长灵敏度分别为887.5mV/nm和-971.7mV/nm,应变分辨力分别达到了0.95με和0.86με.解调系统采用全光结构,解调灵敏度高,稳定性好,性价比高且反应速度快,可实现对地震信号的多点多参量实时检测.
A new kind of seismic signal demodulation system based on the edge band-pass filter is proposed, which is based on the linear sideband of fiber super-fluorescent light source. Since the detection sensitivity of light source plays a decisive role in the sensitivity of the demodulation system, The optimized design makes the slope of the linear section used by the light source greatly increased.The system is divided into two parts by the light source at two oblique sections with the absorption peak at 1530nm and the corresponding four channels in each part. By performing seismic detection simulation on two of the channels, the static wavelength sensitivities of the two parts of the demodulation system are 887.5mV / nm and -971.7mV / nm respectively, and the strain resolution reaches 0.95με and 0.86με respectively. The system uses all-optical structure, high demodulation sensitivity, good stability, cost-effective and fast response, enabling real-time multi-point detection of seismic signals.