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| 瞬变电磁法多匝小回线装置实验对比 | |
| 引用本文： | 张淑婷,张华,杨海燕,孙海.瞬变电磁法多匝小回线装置实验对比[J].物探与化探,2013(5):843-847. |
| 作者姓名： | 张淑婷 张华 杨海燕 孙海 |
| 作者单位： | 1. 山西省煤炭地质物探测绘院,山西 晋中,030600 2. 东华理工大学 核工程与地球物理学院,江西 抚州,344000 3. 乐山师范学院 数学与信息科学学院,四川 乐山,614000 |
| 基金项目： | 国家自然科学基金项目资助(41304097，41004048)；江西省教育厅青年科学基金项目 |
| 摘 要： | 采用实验方法对多匝同一小回线和重叠小回线两种瞬变电磁法工作装置进行了对比研究，探讨了两种装置参数随线圈匝数的变化关系，从而为野外实际勘探提供数据参考。首先在地下一定深度埋置一低阻体，在该低阻体正上方布置一条测线，然后先分析单点数据的发射磁矩、关断时间、感应信号强度随线圈匝数的变化关系，在此基础上对比不同装置随线圈匝数变化的多测道剖面图，分析两种装置的异同点。实验表明两种装置的发射磁矩、关断时间、信号强度及对异常体的分辨能力都随发射线圈匝数的增加而增加；在相同匝数情况下，同一回线的发射磁矩和关断时间稍大，但有效信号部分能量衰减快，信号强度相对较弱，探测深度较浅，然而在有效探测深度下，同一小回线装置对低阻异常体的分辨能力更强。 |
| 关 键 词： | 瞬变电磁法 多匝小回线 重叠小回线 关断时问 |
A COMPARATIVE STUDY OF TRANSIENT ELECTROMAGNETIC DEVICES OF SMALL MULTI-TURN LOOP |
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| ZHANG Shu-ting , ZHANG Hua , YANG Hai-yan , SUN Hai.A COMPARATIVE STUDY OF TRANSIENT ELECTROMAGNETIC DEVICES OF SMALL MULTI-TURN LOOP[J].Geophysical and Geochemical Exploration,2013(5):843-847. | |
| Authors: | ZHANG Shu-ting ZHANG Hua YANG Hai-yan SUN Hai |
| Institution: | 3 ( 1. Geophysical Prospecting, Surveying and Mapping Institute, Shanxi Coal Geological Exploration, Jinzhong 030600, China ; 2. College of Nuclear Engineering and Geophysics, ECIT, Fuzhou 344000, China; 3. School of Mathematics and Informational Sciences, Leshan Normal University 614000, China ) |
| Abstract: | This paper made a comparative study of the experimental devices for multi-turn small loop and discussed the variations of the parameters of two devices along with the turns of the loop, so as to provide the reference for field exploration. Firstly the authors buried a low resistive body at a certain depth and arranged a line above the low resistive body, and then analyzed the launch magnetic mo- ment, the turn-off time, and the variation of the induced signal with the turns of the loop. On such a basis, the authors compared the muhi-channel profile sections of different devices and analyzed their similarities and differences. Experimental results show that the launch magnetic moment, turn-off time, signal strength and resolution to the low resistive body increase with the turns of the loop ; un- der the condition of the same turns, the launch magnetic moment and turn-off time of single loop are relatively large, the effective signal energy is attenuated quickly, the signal strength is relatively weak and the detecting depth is shallower. However, under the effective detecting depth, the resolution of the small single loop to the low resistive body is higher. |
| Keywords: | transient electromagnetic method small single loop small coincident loop turn-off time |
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