PROTEM47CM井下瞬变电磁仪进行掘进头超前探测时线框角度旋转范围的研究

Research on the Angle Rotation Range of Wireframe in Advanced Detection of Advancing Head with Protem47CM TEM Instrument

简述了应用PROTEM47CM型井下瞬变电磁仪进行掘进头超前探测时观测装置的基本特性,推导了本装置在有限的巷道空间内一次场随观测角度变化的函数,并绘制了相关曲线,同时也绘制了不同电流下一次场随角度变化的函数曲线;然后,对一次场进行校正,得出校正后二次场多测道电压信号断面,对比于校正前。最终得出了该装置下进行掘进头超前探测,观测角度应限制在在±60°形成的120°夹角范围内。

This paper briefly describes the basic characteristics of the observation device when using protem47cm underground TEM instrument for advanced detection of heading head,deduces the function of the primary field changing with the observation angle in the limited roadway space,draws the correlation curve,and draws the function curve of the primary field with the angle under different current.Then,the primary field is corrected and the multichannel voltage signal section of the secondary field after correction is obtained.Compared with that before correction,it is concluded that the observation angle should be limited within the range of 120°(formed by±60°)when advanced detection is carried out under this device.