本文主要讲述了Mie散射物理参量的一种改进数值算法, 在抛弃了Mie散射物理参量的经典算法——连分式算法和后向递推算法之后, 在现有利用Matlab计算散射参量的基础上, 充分利用了Matlab内置命令集和函数集, 得出了任意折射率且尺度参数在10-4～104的球形粒子散射参量的准确计算结果。收敛数度比改进后向递推快, 相应的程序简单易读且执行时间大为缩短, 比现有经典算法所用的递推关系较少, 因此在很大程度上避免了递推过程中误差的积累, 保证了计算结果的可靠性。

An improved numerical algorithm of Mie scattering parameter is presented in this paper. After giving up the classical algorithms—Continued Fraction Method and Modified Downward Recurrence Method, we have shown in this paper how to calculate scattering parameters using the functions and commands of Matlab. We obtained the correction results of spherical particles with size parameters from 10-4 to 104 and without any constrain on the refractive index. The speed of convergence is faster than improved Downward Recurrence Method. The program is easy to read and needs less time to program. This improved numerical algorithm has less recurrence than the classical algorithm, so we can avoid the errors that accumulated in the recurrence computation, and ensure the reliability of the results.