分别用几何光学(GOM)、Lorenz-Mie散射方法计算了0.55 μm波段球形粒子的散射特性，并对两种计算方法的准确性进行了分析。研究了粒子尺度参数、折射率虚部对粒子0°散射相函数的影响。结果表明：在粒子尺度参数大于60时，GOM计算的球形粒子的散射特性与Mie非常接近。在粒子尺度参数小于1 000时，两种方法得到的前向散射相函数与粒子尺度参数均成二次方关系，且计算结果基本一致；随着粒子尺度参数的增大，前向散射与尺度参数之间将逐步失去二次方关系。当粒子尺度参数大于10 000时，采用GOM方法得到的结果要比Mie散射方法的结果偏大；当粒子尺度一定时， 0°散射相函数与折射率虚部之间呈先增大后减小的规律。

The geometrical optics method(GOM) and Lorenz-Mie method were used to study the scattering properties of spherical particles at the wavelength of 0.55 μm, and the accuracy of the two methods were analyzed. The impacts of particle size parameter and the imaginary part of the refractive index on the forward scattering phase function of spherical particles were investigated. The results show that the scattering properties of spherical particles calculated by GOM and Mie are very close when the particle size parameter is greater than 60. When the particle size parameter is less than 1 000, the relationship of the forward scattering phase function with the particle size parameter can be described with a quadratic formula, and the results of GOM and Mie are identical with the increase of the particle size parameters, they gradually lose their quadratic relationships. When the particle size parameter is larger than 10 000, the GOM result is larger than that of Mie′s result. For a particle size parameter, the forward scattering phase function firstly increases and then decreases with the imaginary part of refractive index.