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基于电磁散射与辐射传输中的基本理论,对紫外波段霾尺度范围内满足特定分布的多种气溶胶粒子的散射相函数进行了研究.提出了一种直接随机抽样拟合散射相函数的方法.比较了H-G相函数、改进的H-G相函数及随机抽样拟合的相函数与多分散系Mie相函数的偏离程度.数值计算了不同相函数拟合方法对应气溶胶的传输特性.计算结果表明,相函数的准确模拟计算对于蒙特卡罗方法等辐射传输问题的解决具有十分重要的意义.
Based on the basic theories of electromagnetic scattering and radiation transmission, the scattering phase functions of a variety of aerosol particles satisfying specific distribution in the ultraviolet range of haze scale are studied, and a direct random sampling fitting scattering phase function method is proposed. The deviations of the HG phase function, the modified HG phase function and the random sampling fitting phase function from the polydisperse Mie phase function were compared. The aerosol transmission characteristics were calculated numerically by different phase function fitting methods. Accurate simulation of phase functions is very important for the solution of radiation transmission problems such as Monte Carlo method.