瞬变电磁法探测盲区深度减少和探测深度增加技术

The technology of reduce the detection blind area depth and increase the detection depth of transient electromagnetic method

为解决瞬变电磁法在井下探测时存在探测盲区和探测深度受限等问题,根据瞬变电磁法工作原理,对瞬变电磁法盲区深度减少技术和探测深度增加技术进行研究。在早期信号的基础上,根据最小二乘法原理,将感应电位的衰减曲线借助Matlab工具进行拟合,并在YCS40(A)的软件处理中进行叠加,经4次拟合后,结果较为理想,可减少盲区深度至18 m;通过对瞬变电磁仪线圈边长大小、发射频率和深度系数的对比分析发现,采用2 m发射线圈,通以大电流,调节最低发射频率,提高时深转换系数,可增加TEM探测深度。研究结果可指导井下瞬变电磁法的应用,对确保煤矿企业安全生产具有重要意义。

In order to solve the problem that the detection blind area and the detection depth of the transient electromagneticmethod to detect the underground, according to the working principle of the transient electromagneticmethod,the technology of reduce the detection blind area depth and increase the detection depth oftransient electromagnetic method is studied. According to the principle of least square method, it is used theMatlab to fit the induction potential decay curves on the basis of the early signal, then dealing with the softwareof YCS40 （A） to stack, it can get the ideal results after forth fitting that can effectively reduce the blind areadepth to 18 m. Compared and analyzed the coil size, emission frequency and depth coefficient of transient electromagneticinstrument, it found that using the 2 m transmitter coil with high current, adjusting the minimum transmission frequency and increaseing deep conversion coefficient can increase the TEM detection depth. Theresults can guide the application of the transient electromagnetic method, and has the significance to ensuresafe production of coal mining enterprises.