辐射传输方程中非对称因子的估算  

Evaluation of the asymmetry factor in the radiative transfer equation

作　　者：杨春平[1] 吴健[1] 冷杰[2] 

机构地区：[1]电子科技大学光电信息学院,四川成都610054 [2]中国工程物理研究院应用电子学研究所,四川绵阳621900

出　　处：《红外与激光工程》2006年第z4期483-487,共5页Infrared and Laser Engineering

基　　金：国家自然科学基金委-中国工程物理研究院联合基金(10376007)

摘　　要：非对称因子是辐射传输理论中一个十分重要的参数.基于Mie理论,对单分散系粒子单次散射的非对称因子进行了研究和计算.结果证实:在折射率实部一定情形下,非对称因子有确定的极限值,例如,实折射率为1.33时,该极限值为0.884 7;对实际大气而言,非对称因子一般不会超过0.8.对辐射传榆计算中非对称因子的取值对Mie像函数、H-G像函数和H-G*像函数的影响进行了比较,结果表明:在相同的非对称因子下,H-G*像函数更接近Mie散射像函数.The asymmetry factor has played an important role in dealing with the Radiative Transfer Equation (RTE).The asymmetry factor of light scattering of spherical particles is studied and calculated based on the Mie theory for size parameters in 0～30 and 0～2000 for different refractive indexes.The results show that its value has a limit corresponded to a certain real refractive index,for example,this limit equals to about 0.8847 while|m|=1.33. Influences of the asymmetry factor on RTE are taken into account and discussed.It is shown that an asymmetry factor in RTE should usually be less than 0.8 for real atmosphere.Comparison are also made for different asymmetry factors effecting on scattering phase function and revealed that there are less differences between modified Henyey-Greestein(H-G~*)than Henyey-Greenstein(H-G)and Mie phase function for a certain asymmetry factor.

关 键 词：非对称因子 散射像函数 辐射传输方程 单次散射 MIE理论 

分 类 号：O572[理学—粒子物理与原子核物理]