顺次采样对三分量检波器性能的影响

Ｏｍｎｉｐｈｏｎｅ三分量地震检波器是大庆石油管理局从加拿大引进的智能型三分量检波器．该检波器内部含ＣＰＵ，其最大特点具有“极化滤波”的处理功能．“极化滤波”是根据质点在三维空间的运动轨迹不同，压制圆形质点运动轨迹的干扰面波，而保留直线质点运动轨迹的有效波信号．介绍了该检波器芯体结构及顺次采样的硬件、软件的功能实现．在此基础上分析了顺次时延采样对理想线性体波及圆形面波的影响．最后，提出了改进方法及其工程实现．结果表明：采样时延由２５０μｓ减小到５０μｓ后，三分量的频率响应特性更加平坦，分量间的串扰降低；三个分量对理想圆形面波的压制能力亦有所提高；随着分析信号频率的提高，效果更加显著．

Influence of Sequential Sampling on the Performance of Omniphone

Omniphone,a three component digital geophone,is imported from Canada by Daqing Petroleum Administration Bureau.A central processing unit (80186) is in it.Polarization filtering is its main distinguishing feature.According to the movement path of a particle in three dimensional space,polarization filtering can reduce circular interfering surface wave,and remains linear body wave.In this paper,the core configuration of omniphone is discussed first,then the hardware module,the software structure for sequential sampling and the influence of sequential sampling on the pure linear body wave and the circular surface wave,lastly the modifying measures to omniphone.The results of test show that after sampling delay time is reduced from 250μs to 50μs ,omniphone can effectively attenuate circular surface wave,the interference between two horizontal components is greatly decreased,and the frequency response curves of three components become more even.the higher the frequencies of analysed singnals,the more remarkable the modification effect.