Method and technique of using 3-electrode electrical sounding at different positions in a roadway for detecting the location and water content of collapse-column was put forward. 摘要提出了用不同方位巷道三极直流电测深法探测陷落柱位置及其富水性的技术。
The influences of atmospheric turbulence on interference efficiency due to the angle of arrival fluctuation in the laser heterodyne detection system were presented. 研究了大气湍流情况下到达角起伏对激光外差探测系统干涉效率的影响。