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Theoretical Study of Inductance Effect With Multi-axial Coils for TEM in Underground Mine

YANG Hai-yan,YUE Jian-hua,LIU Zhi-xin College of Mineral Resource and Environment Sciences,CUMT,Xuzhou,Jiangsu 221008,China  
Because of the self-transition of the loop the early signal of TEM is greatly abnormal.In order to study the characteristics of the early signal with TEM,both self-induction formula of single coil and multiturn coils are given;the theoretical expressions of amplitude of loop self-induction signal is deduced,the induction of multi-axial coils is also given.The transient process of transient electromagnetic loop and the attenuation of induced voltages induced by many coils of loop are discussed,disturbed factors of the early signal is also studied.which considered that the attenuation of loop self-induction signal is not only relative to time,but also to the material of equivalent loops;Which lay a foundation for the further study on the additional effect of the early field.The objective is to provide these as a reference for further research.
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