铁路运行速度的提高，要解决的关键技术之一是如何有效地防止在了望条件不好的情况下，列车与线路上的障碍物发生冲突。本文介绍并比较了几种红外探测方法，对扫描式热成像技术应用于铁路行车，并组成安全监控系统的可能性进行分析，拟解决提速后的列车在夜间或低能见度条件下行车安全的问题。 One of the key technologies to be solved is how to effectively prevent the collision between the train and the obstacle in the line under the condition of poor visibility. This paper introduces and compares several methods of infrared detection, analyzes the possibility of applying scanning thermal imaging technology to railway traffic and composing safety monitoring system, and proposes to solve the problem of driving safety of train after driving at night or under low visibility .