PDS型地震仪拾振器幅频特性测试  

Amplitude-frequency characteristics testing of the geophone of PDS seismometer

作　　者：李从庆[1,2] 徐以福 原秦喜[2] 孙鸿[2] Li Congqing;Xu Yifu;Yuan Qinxi;Sun Hong(Institute of Geophysics, China Earthquake Administration, Beijing 100081, China;Geophysical Exploration Center, China Earthquake Administration, Zhengzhou 450002, China;Xichang Satellite Launch Center, Sichuan Province 615000, China)

机构地区：[1]中国地震局地球物理研究所,中国北京100081 [2]中国地震局地球物理勘探中心,中国郑州450002 [3]中国西昌卫星发射中心,中国四川615000

出　　处：《地震地磁观测与研究》2017年第1期112-116,共5页Seismological and Geomagnetic Observation and Research

基　　金：中国地震局地球物理勘探中心青年优秀科技人才专项(项目编号:SFGEC2014010)

摘　　要：PDS型地震仪是中国地震局地球物理勘探中心研制生产的轻便数字地震仪,用于开展人工地震测深宽角度折/反射探测工作。目前,由于地震仪拾振器传递函数的缺失,导致无法从采集的人工地震波形数据中获取精确的地球动力学信息,在一定程度上限制了对人工地震数据进行深度挖掘并开展科学研究的工作。基于超低频振动台测试,利用测定地震仪拾振器幅频特性和Matlab数值拟合,提出一种拾振器传递函数辨识方法,并给出传递函数的数学表达式。实验结果表明,利用该方法可以实现拾振器传递函数的辨识,且可达到幅频特性绝对误差<0.5 d B的辨识精度。The PDS seismometer is developed by Geophysical Exploration Center of China EarthquakeAdministration,which has been massively equipped and widely used in artificial seismic soundingand wide angle refraction/reflection geophysical probe.Because of the absence of the transferfunction of the geophone internally installed in PDS seismometer,it results in the fact thatgeodynamical information cannot be properly calculated from the artificial seismic raw data sothat the seismic data mining and scientific research work to some extent is restricted.On the basisof table vibrator testing,this article makes use of the amplitude-frequency characteristics testingof the geophone and Matlab curve fitting methods to build the transfer function of the geophone.The experimental results show that the transfer function identification method is effective and thefitting accuracy of amplitude-frequency characteristics<0.5dB.

关 键 词：PDS型地震仪 拾振器 幅频特性测试 传递函数 曲线拟合 

分 类 号：P315.62[天文地球—地震学]