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 dB的辨识精度。
The PDS seismometer is developed by Geophysical Exploration Center of China Earthquake Administration, which has been massively equipped and widely used in artificial seismic sounding and wide angle refraction/reflection geophysical probe. Because of the absence of the transfer function of the geophone internally installed in PDS seismometer, it results in the fact that geodynamical information cannot be properly calculated from the artificial seismic raw data so that the seismic data mining and scientific research work to some extent is restricted. On the basis of table vibrator testing, this article makes use of the amplitude-frequency characteristics testing of 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 the fitting accuracy of amplitude-frequency characteristics <0.5 dB.
2017,38(1): 112-116 收稿日期：2016-04-15
DOI：10.3969/j.issn.1003-3246.2017.01.019
基金项目：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）
作者简介：李从庆(1982-),男,河南安阳人,在读博士,高级工程师,主要研究方向:嵌入式系统技术与地震仪器研制
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