关键词: 强场源TEM, 矿山噪声, 发射磁矩, 信噪比, 勘探深度

Abstract: To counter the strong noise in the mine and to meet the requirement of great exploration depth,the strong source Transient Electro-magnetic (TEM) system is applied to the exploration of substituted resource of crisis-ridden large mine. The system adopts double signal synchronous stacking method to enhance the transmitted magnetic moment. In other words,it enhance the signal-noise ratio and enlarge the exploration depth by increasing transmitted current and using reasonable transmitter coil length. In practical exploration of the Fenghuangshan copper mine,Anhui Province,the two transmitters of the ATEM-Ⅱ system made by Jilin University were synchronously operated,increasing the transmitted current from 2.4A to 38.5A,and enhancing the SNR of late time transient signal from 0.275 to 2.93.In this way,the effective exploration depth may reach up to 650m. The results show that the strong source TEM system opens up broad prospects for the exploration of the substituted resources for large mine.

Key words: strong source TEM, industry noise, transmitted magnetic moment, signal to noise ratio, exploration depth