基于雾滴谱分布的雾场散射特征分析  

Fog Field Scattering Analysis with Drop Size Distribution

作　　者：魏海亮[1] 邵利民 李天伟[3] 

机构地区：[1]海军大连舰艇学院研究生管理大队,辽宁大连116018 [2]海军大连航艇学院军事海洋系,辽宁大连116018 [3]海军大连舰艇学院航海洋系,辽宁大连116018

出　　处：《激光与光电子学进展》2014年第12期87-93,共7页Laser & Optoelectronics Progress

基　　金：国家博士后基金(2014M552659)

摘　　要：不同地区的平流雾和辐射雾具有差异化的雾滴谱分布,导致雾场对光辐射具有不同的衰减特性。Mie散射适用于描述雾场气溶胶微粒的散射与衰减,光传播遵循动态的粒子数守恒过程。采用雾滴谱分布函数修正气溶胶微粒的相位矩阵,分析了红外光在雾场气溶胶微粒团簇中的散射光偏振性。结果表明,决定雾场气溶胶微粒退偏特性的因素主要包括雾滴谱分布、雾滴折射率、吸收系数以及入射波长等。在前向散射区域内,退偏性随能见度的增加而减弱,在大部分后向散射区域内,表现出相反的趋势。There exist various of fog drop size distributions in advection fog and radiation fog, which result in the different attenuation performances as light propagates in fog field. Mie theory can describe the scattering and attenuation of aerosol particles in fog field, while light propagation follows the principle of dynamic particles conservation. In this paper, fog drop size distribution is applied to modify the scattering phase matrix of aerosol particles, and the scattered light＇s polarization can be solved when infrared light penetrates into aerosol particle clusters. The results show that aerosol particles＇ depolarization mainly depends on fog drop size distribution, fog drop refractive index, absorption coefficient and incident wavelength. In the forward-scattering area, depolarization decreases as visibility increases, while the opposite trend occurs in most backward- scattering area.

关 键 词：大气光学 大气散射 多重散射 雾滴谱 偏振性 

分 类 号：O436.2[机械工程—光学工程]