浅海底瞬变电磁法接收天线频率特性研究——带宽对浅层分辨的影响  

Frequency characteristic of receiver coil in shallow seafloor transient electromagnetic sounding system ——The Influence of bandwidth on the low subsurface resolving power

作　　者：周逢道[1] 林君[1] 刘长胜[1] 王艳[1] 周国华[1] 李慧[1] 

机构地区：[1]吉林大学地下信息探测仪器教育部重点实验室,长春130026

出　　处：《地球物理学进展》2006年第4期1342-1345,共4页Progress in Geophysics

基　　金：国家高技术研究发展计划(863计划)(2002AA615030)资助

摘　　要：运用电路理论建立接收线圈的等效电路;分析接收线圈的频率特性;探讨多匝小线圈的带宽对探测效果的影响,线圈的谐振频率较高,截止频率也相应较高,可以提高地下浅层的分辨率;设计一种高带宽多匝接收小线圈,通过对比高、低带宽接收线圈对同一断层进行的实测结果,阐明了接收线圈带宽在浅层瞬变电磁探测中的重要性.实验表明,高带宽的接收线圈会提高探测结果的浅层分辨率.Based on electrocircuit theory, the equivalent circuit characteristic of receiver coll is analyzed. The discussion about of receiver coil is established, and then the frequency the effect of frequency characteristic of small receiver coil on the exploration result shows that the higher syntony frequency of coil, the higher cut-off frequency of coil, and therefore the higher resolving power of low subsurface. In the end, a kind of high-bandwidth, multiturn, small coil is introduced. A high-bandwidth receiver coil and a low-bandwidth one are respectively used to explore the same faultage in field. By comparing their results, the importance of high bandwidth of receiver coil in shallow transient electromag netic exploration is indicated. This proves that the high-bandwidth receiver coil can improve resolving power of low subsurface.

关 键 词：瞬变电磁法 多匝 接收线圈 带宽 

分 类 号：P631[天文地球—地质矿产勘探] P738[天文地球—地质学]