阻尼系数对瞬变电磁观测信号的影响特征  

Characteristics of damping coefficient effect on transient electromagnetic signal

作　　者：王华军[1] 

机构地区：[1]浙江大学地球科学系,杭州310027

出　　处：《地球物理学报》2010年第2期428-434,共7页Chinese Journal of Geophysics

基　　金：中国博士后科学基金项目(20070411190)资助

摘　　要：通过对瞬变电磁接收线圈等效电路的深入分析,研究了接收系统分布参数与阻尼系数之间的关系,研究了不同阻尼系数瞬变电磁接收系统的性能特征:幅频特性、截止频率、冲激响应及阶跃响应,探讨了接收系统对地下地质体瞬变响应信号的影响特征,最后给出了实时计算临界阻尼电阻的方法.By thorough analysis of the equivalent circuit of transient electromagnetism receiver coil, we studied the relations between the receiving system distribution parameter and the damping coefficient, the performance characteristic of different damping coefficient transient electromagnetism receiving system, i. e., the amplitude-frequency characteristic, the cut-off frequency, the impulse response and the step response, discussed the influence characteristic of the receiving system to the underground geologic body transient response signal, and finally gave the real-time computation method of critical damping-resistance.

关 键 词：瞬变电磁法 阻尼电阻 幅频特性 冲激响应 超前勘探 

分 类 号：P631[天文地球—地质矿产勘探]