high-seam working face 大采高综采工作面
Compared with the common seam track system, this article introduces the working principle of optical sensor with structured light.
对几种常见的焊缝跟踪系统进行比较，着重介绍了结构光式视觉传感器的工作原理。
The ultrasonic sensor and the working principle in the seam tracking are explained.
介绍了超声波传感器及其焊缝跟踪工作原理。
Based on the analysis of gas source at the working face with "three-soft" unsteady coal seam, the authors introduce the principle and method of gas suction by roof-rock drilling.
前言： 通过对“三软”不稳定煤层采煤工作面瓦斯来源的分析，介绍了采用顶板岩石钻孔抽放解决瓦斯问题的原理和方法。
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