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由矿震引发的灾害严重制约着矿产资源合理开发与利用。为实现对矿山动力灾害活动规律的预警,将光纤光栅加速度传感器引入微震监测。基于传统的单维测量手段,设计了一种三维加速度传感器,并通过理论计算得出该系统固有频率为2800.6Hz,工作频率为0~840Hz和3640~4200Hz,灵敏度系数为0.32pm/m/s2。室内试验结果表明该传感器达到了同时测量加速度三分量的目的。采用FFT变换将中心波长变化曲线转化成了频率强度曲线,可以同时测定振动的加速度大小和方向。
Disasters caused by the earthquake have severely restricted the rational exploitation and utilization of mineral resources. In order to realize the warning of the regularity of mine dynamic disasters, FBG accelerometer is introduced into microseismic monitoring. Based on the traditional single-dimension measurement method, a three-dimensional acceleration sensor is designed. The theoretical natural frequency of the system is 2800.6Hz, the operating frequency is 0 ~ 840Hz and 3640 ~ 4200Hz, the sensitivity coefficient is 0.32pm / m / s2 . The indoor test results show that the sensor achieves the purpose of simultaneously measuring three components of acceleration. Using FFT transform the center wavelength curve into the frequency intensity curve, you can simultaneously determine the magnitude and direction of vibration acceleration.