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采用波分/空分混合复用的方案,构建了基于分布反馈光纤激光器(DFBFL)的两级三分量地震检波器阵列,通过相干探测技术实现高分辨率的波长解调,并对检波器进行了测试。结果表明,阵列中传感器的本底噪声小于70ng/√Hz,对微弱振动信号的探测能力优于传统动圈检波器,三分量检波器的交叉灵敏度小于-20dB,通道间串扰小于-80dB,为多维多分量地震勘探提供了一种新的技术途径。
A two-stage, three-component geophone array based on distributed feedback fiber laser (DFBFL) was constructed by using the combination of wavelength division and space division multiplexing. The coherent detection technique was used to achieve high-resolution wavelength demodulation. The test. The results show that the noise floor of the sensor in the array is less than 70ng / √Hz. The detection ability of the weak vibration signal is better than that of the traditional moving coil detector. The cross-sensitivity of the three-component detector is less than -20dB and the crosstalk between channels is less than -80dB. Multi-dimensional multi-component seismic exploration provides a new technical approach.