双频道幅频观测的异常

来源期刊：中南大学学报(自然科学版)1982年第2期

论文作者：何继善 鲍光淑

文章页码：49 - 54

关键词：双频道； 变频法； 视幅频率； 观测； 模拟实验； 电位差； 谐波成分； 矩形波； 接收机； 激电异常

摘    要：双频道幅频观测既同时供双频电流,又同时测双频电位差,井自动计算幅频率。双频电流的谐波成分与变频法所用矩形波电流的谐波成分是有差别的。但理论分析、模拟实验及野外观测均证明,双频道幅频观测的异常与变频法异常形态相同,且数值也十分接近。双频道幅频观测的发现异常能力与时间域激电法及变频法相当,而前者更轻便、快速、精度高。

Abstract: The dual-channel measurement of IP frequency effect is a new kind oftechnique in frequency domain IP method. Not only is the dual frequencycurrent transmitted simultaneously but the electric potential differences oftwo frequencies are also received and measured synchronously. A digitalsystem is used to directly analyze the results which are displayed in percentfrequency effect with a liquid crystal display. There are many differencesbetween harmonic contents of dual frequency current and a square wave oneused in variable frequency method. However, theory analysis, laboratorymodelling and field data all show that the anomalies both in dual frequencytechnique and variable frequency technique are similar in character andclose in quantity. The ability to find IP effect in dual frequency technique,in variable frequency technique and in time domain technique is the same.But the measurements made in dual frequency technique are more portable,more rapid and more accurate, and more simple in operation.