Effect of the reflection of underlying surface on sky radiance distribution  

作　　者：杨春平 魏凌 吴健 冷杰 

机构地区：[1]School of Opto-Electronic Information University of Electronic Science and Technology of China [2]Institute of Applied Electronics China Academy of Engineering Physics

出　　处：《Chinese Optics Letters》2007年第3期125-127,共3页中国光学快报（英文版）

基　　金：This work was supported by the National Natural Science Foundation of China under Grant No. 10376007.

摘　　要：Sky radiance might be influenced by the multiple reflectance between the earth＇s albedo surface and the atmosphere. Based on the Lambert＇s law and the radiative transfer equation （RTE）, a model is developed to calculate the additional sky radiance at wavelengths of 0.4-3μm due to the reflectance contribution of the underlying surface. The iterative method is used to calculate sky radiance without the reflectance from underlying surface. The hybrid modified delta-Eddington approximation is used to compute the atmospheric reflection of the radiation from the earth＇s surface. An interaction factor is introduced to deal with the multiple reflectance between the atmosphere and the underlying surface. The sky radiance increment is evaluated for some different albedos of the earth＇s surface. The results show that the sky radiance increment rises rapidly while viewing zenith angle is near to 90°and the larger the albedo of the earth＇s surface is, the more obvious this effect appears.Sky radiance might be influenced by the multiple reflectance between the earth＇s albedo surface and the atmosphere. Based on the Lambert＇s law and the radiative transfer equation （RTE）, a model is developed to calculate the additional sky radiance at wavelengths of 0.4-3μm due to the reflectance contribution of the underlying surface. The iterative method is used to calculate sky radiance without the reflectance from underlying surface. The hybrid modified delta-Eddington approximation is used to compute the atmospheric reflection of the radiation from the earth＇s surface. An interaction factor is introduced to deal with the multiple reflectance between the atmosphere and the underlying surface. The sky radiance increment is evaluated for some different albedos of the earth＇s surface. The results show that the sky radiance increment rises rapidly while viewing zenith angle is near to 90°and the larger the albedo of the earth＇s surface is, the more obvious this effect appears.

关 键 词：Atmospheric optics Iterative methods Light reflection Mathematical models 

分 类 号：O436[机械工程—光学工程]