基于光纤光栅加速度传感器的平面震动定位试验

岩石等介质在外力作用下发生变形或开裂破坏过程中，释放弹性能产生微震事件。基于光纤传感技术的微震监测系统采用光纤光栅加速度传感器，在信号传输过程中不受光强影响，传输距离远，本质安全，抗电磁干扰，克服了传统电子类微震传感器的缺点。为验证系统性能，进行了平面震动监测试验，利用最小二乘法实现震源平面定位。试验采集信号波形清晰，高信噪比，高阻尼，传感器布置在震源周围时，定位精度大大提高，震源定位误差并不随采样频率提高而降低。试验结果对光纤传感微震监测系统应用于煤矿井下冲击地压监测具有重要的借鉴意义。

Experimental Research on Plane Vibration Location based on Optical Fiber Grating Acceleration Sensors

In the process of deformation or cracking damage of rock and other media under external force,the elastic energy may release to generate microseismic events.Microseismic monitoring system based on optical fiber sensing technology adopting optical fiber grating acceleration sensors,which is not affected by light intensity in the process of signal transmission,has long distance transmission,intrinsic safety,anti-electromagnetic interference and overcome the shortcomings of traditional electronic microseismic sensors.To verify the system performance,the plane vibration monitoring experimental was carried out,and the least square method was used to achieve microseismic source plane location.Experimental acquired clear waveform,high signal to noise ratio,high damping,the location precision is greatly improved when sensors are arranged around the source.Microseismic source location error isn’t decreasing with the increasing of the sampling frequency.This experiment is an important reference for optical fiber sensing microseismic monitoring system used in the rock burst monitoring in coal mine.