激光雷达探测绝热水云退偏振特性模拟研究  

Simulation Study of Lidar Detection of the Depolarization Ratio of Adiabatic Water Clouds

作　　者：王海华[1] 孙贤明[1] 王艳萍[1] 王军[1] 

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255049

出　　处：《光散射学报》2017年第4期343-347,共5页The Journal of Light Scattering

基　　金：国家自然科学基金(61205191);山东省自然科学基金(ZR2013FL023)

摘　　要：本文模拟了偏振激光雷达探测绝热水云微物理特性时由多次散射引起的退偏振问题,绝热水云的数密度在垂直方向上为定值,液态水含量和云滴有效半径随高度非线性增长,其变化规律由云层的大气压、温度以及绝热水云形成的热力学过程共同决定。激光雷达波长取0.355!m,分别计算了云底高度为1km和2km的绝热水云退偏振比随穿透深度的变化,计算结果表明,绝热水云的退偏振比随穿透深度的增加而增大,随观测视场角的增大而增大,且其变化规律与均匀各向同性云层差距很大。另外,云层高度为2km的云层有效半径比云底高度为1km的更小,在同样数密度和观测条件下,退偏振比也更小。We simulated the depolarization signal in adiabatic water clouds due to the occur- rence of multiple scattering when measure the microphysics characteristics using depolarization lidar. The number density of the adiabatic water clouds is constant in vertical direction. The liquid water content and the effective radius are nonlinear increasing with the height, and the varying rule is controlled by the barometric pressure, temperature, and the thermodynamic formulas. The wavelength of the lidar we can see that depolarization ratio incre is chose as 0. 355 /am. From the computing results, asing with the depth of the cloud, and it increasing with the receiving field of view angle, but it has great difference with the homogeneous cloud. The effective radius of the cloud with clouds base height is 2 km are less than the one with cloud base height is 1 km, so the depolarization ratio is also small with same number density and observation conditions.

关 键 词：激光雷达 绝热水云 退偏振比 蒙特卡罗方法 

分 类 号：O436[机械工程—光学工程]