采用摄像机拍摄大空间建筑内烟气运动的整个过程 ,从录像中获取烟气前沿和主体下降到各指示灯的时间 ,经时间截取法处理后得到烟气层界面形成及运动的实际时间 ,求烟气层高度x对该时间t的关系可得烟气运动曲线。把该曲线与采用热电偶测温法及目测法的结果进行对比可知 ,三者趋势较为吻合 ,表明摄像这种测量手段能较好地反映大空间建筑火灾中烟气流动的状况及部分运动规律 The whole process of the flue gas movement in a large space building was taken with a video camera. The front of the flue gas and the time when the main body descended to each indicator light were obtained from the video. The actual time for the formation and movement of flue gas layer interface was obtained after the time interception method was processed. The relationship between the height of flue gas x and time t gives the smoke movement curve. Comparing this curve with the results of thermocouple temperature measurement and visual inspection shows that the three trends are in good agreement with each other, which shows that this measurement method of camera can better reflect the status of flue gas flow and some of the movement rules in large-scale building fires