过套管电阻率测井仪信号调理电路的设计  

Design of Signal Conditioning Circuits for Cased-hole Resistivity Logging Tool

作　　者：耿敏[1] 梁华庆[1] 曹旭东[1] 尹洪东[1] 张晓亮[1] 

机构地区：[1]中国石油大学(北京)地球物理与信息工程学院,北京102249

出　　处：《科学技术与工程》2011年第6期1171-1175,共5页Science Technology and Engineering

摘　　要：超低频、纳伏级信号的检测,以及强干扰的抑制是过套管地层电阻率测井需要解决的关键问题。根据待测信号的特点,选用超低噪声、低漂移元器件,设计了相应的信号调理电路。测试结果表明,调理电路能有效抑制干扰信号、准确提取有用信号、实现了50 nV信号的可靠测量。As far as cased-hole formation resistivity logging,the key problems needed to be solved are detection of ultra-low frequency and extremely weak signals,as well as reduction of strong interferences.Based on the features of signals to be measured,the corresponding signal conditioning circuits are designed with the components of ultra-low noise and low distortion.Experimental results demonstrate that the signal conditioning circuits can reduce interference signals effectively,extract useful signals accurately and realize the reliable measurement of 50 nV signal.

关 键 词：过套管电阻率测井仪 信号调理电路 低噪声前置放大 低通滤波 

分 类 号：P631.322[天文地球—地质矿产勘探]