地电观测中的系统误差消除方法及其在地电仪中的应用  

METHODS FOR REMOVING SYSTEM ERRORS IN MEASURING EARTH RESISTIVITY AND ITS APPLICATION IN TERRAMETER

作　　者：张世中[1] 赵家骝[2] 王燕琼[2] 

机构地区：[1]中国地震局兰州地震研究所,甘肃兰州730000 [2]中国地震局分析预报中心,北京100036

出　　处：《西北地震学报》2001年第3期291-296,共6页Northwestern Seismological Journal

基　　金：中国地震局兰州地震研究所论著编号 :LC2 0 0 10 4 7

摘　　要：从地电观测的基本原理出发 ,分析了系统误差产生的原因 .认为系统误差的大小决定于装置系数K值、取样电阻RI 及测量ΔV和VRI 的准确度 .在地电仪中选用高精度、高稳定性的RI,采用“浮空”测量法及采用同一个动态范围大、线性度高的A/D转换器测量ΔV和VRI,可以减小地电阻率观测的系统误差 .最后通过实验验证了“浮空”测量法的效果 .Analyzing reasons for system errors in measurement of earth resistivity, several methods to remove the errors are proposed. It's believed that the system errors are influenced by the accuracy of setting coefficient K,sampling resistor R I and measured ΔV and V R I .The R I with high precision and stability is chosen,the 'suspending' measurement is applied and the same A/D converter with wide dynamic range and high linearity is used to measure Δ V and V R I in developed terrameter by the authors for decrease of the system errors.At last,effect of the 'suspending' measurement is verified by test in laboratory.

关 键 词：地电仪 系统误差 标准电阻 “浮空”测量 A/D转换器 地电观测 

分 类 号：P315.62[天文地球—地震学] P315.721[天文地球—固体地球物理学]