LT31大气透射仪工作原理及受天气影响的个例分析

The Operating Principles of Transmissometer LT31 and the Effect of Weather

本文从LT31工作原理入手,对大连机场3次RVR数值失准的个例进行对比分析,发现当降雨天气并伴有大风时,如风向与跑道方向接近,LT31的探测数值会出现偏低的情况;其原因是风雨天气会对LT31窗口造成污染,而这种污染是LT31自身难以检测与补偿的。

In this article, three examples of incorrect RVR readouts measured by transmissome ter LT31 at Dalian Airport are analyzed. From the operating principles of transmissometer LT31, we find that under heavy rain conditions accompanied by strong winds, especially when wind direction is close to the runway direction, the LT31 readouts tend to be low. The reason is that wind and rain will cause pollution to LT31 window, which is hard to detect and compensate by LT31 itself.