基于光纤光栅加速度传感器的平面震动定位试验
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摘要
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。
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.
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.
引文
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[3]田玥,陈晓非.地震定位研究综述[J].地球物理学进展,2002,17(1):147-155.
[4]平健,李仕雄,陈虹燕,等.微震定位原理与实现[J].金属矿山,2010(1):167-169.
[5]邹翔宇,徐翊峰,关博文,等.基于无线传感器网络的矿震震源定位[J].煤矿安全,2010(10):80-84.
[6]周彦文,刘希强,李铂,等。基于单台P波记录的快速自动地震定位方法研究[J].地震研究,2010,33(2):183-188.
[7]彭永超,王洪杰,何雪梅.震源定位技术的应用于发展[J].物探装备,2006,16(S):11-13.
[8]吴娟,于笑非,潘科.提高地震定位精度方法的研究[J].东北地震研究,1999,15(3):50-56.
[9]Gelger L.Probability method for the determination of earthquakeepicenters from arrival time only[J].Bulletin of Saint Louis Uni-versity,1912(8):60-71.
[10]Spence W.Relative epicenter determination using P-wave arrivaltime differences[J].Bulletin of the Seismological Society of Ameri-ca,1980,70(1):171-183.
[11]Rutledge J T,Phillips W S,House L S,et al.Microseismic Map-ping of a Cotton Valley Hydraulic Fracture Using Decimated Down-holearrays,Expanded Abstracts[M].New Orleans:Ann InternatMtg Soc Explor Geophys,1998.
[12]李会义,姜福兴,杨淑华.基于Matlab的岩层微地震破裂定位求解及其应用[J].煤炭学报,2006,31(2):154-158.
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