半导体激光雷达的斜程能见度测量方法  

Measuring method of atmospheric slant visibility with semiconductor lidar

作　　者：岳斌[1] 董晶晶[1] 孙东松[1] 沈法华[1] 董吉辉[1] 舒志峰[1] 

机构地区：[1]中国科学院安徽光学精密机械研究所大气光学重点实验室,安徽合肥230031

出　　处：《红外与激光工程》2009年第1期135-139,共5页Infrared and Laser Engineering

摘　　要：针对雾天或多云天气等不均匀大气中斜程能见度难以测量的问题,提出了利用905nm半导体激光雷达探测大气斜程及水平能见度的方法,能够探测50～2000m能见度范围。介绍了半导体激光雷达的系统结构,利用激光雷达测量大气能见度的原理,探测大气斜程平均能见度值。详细阐述了一种稳定的通过大气消光系数反演能见度的迭代算法,可实现迭代边界值最大距离的自动化选取,提高了迭代结果的可靠性。通过模拟计算,对该迭代方法的精度进行了评估。结果显示:50、200、800、2000m的能见度,迭代精度分别为33%,2%,0.1%,0.3%,由于采样点少导致极低能见度的迭代精度较低。A method was presented, which was used for measuring atmospheric slant integral visibility with semiconductor lidar in conditions of inhomogeneous atmosphere such as foggy and cloudy. This technique makes it possible to measure slant and horizontal visibilities from 50 m to 200 0 m. Configuration of the 905 nm semiconductor lidar which is under developing was introduced; principles of measuring atmospheric visibility with lidar were presented, which can detect slant visibility through the whole atmospheric layer.An inversion method based on stable iteration arithmetic to invert the atmospheric extinction was described in detail. The method makes it possible to choose the boundary value （maximum range） automatically, which improves the reliability of the results.Simulated results of the iteration method show that in the visibilities of 50 m, 200 m, 800 m and 2 000 m, the accuracies are 33%, 2%, 0.1% and 0.3%, respectively.The iterative accuracies for extreme low visibilities is low are due to lacking of sample numbers.

关 键 词：大气斜程能见度 半导体激光雷达 大气消光系数 迭代算法 

分 类 号：TN958.98[电子电信—信号与信息处理]