摘要：在光散射颗粒测量技术中,Mie散射理论的计算非常重要。本文中讨论了双层球形颗粒光散射的计算方法,对计算过程中不同函数参量选用了合适的递推计算方法,改进的计算方法克服了以前算法在实际运算中遇到的误差。计算了若干物理量,如消光系数、散射系数、吸收系数以及CPU运算速度。计算结果表明,选用的方法简单、迅速、稳定且误差小。

关键词：双层颗粒；Mie散射；数值计算方法

Abstract：It is important to calculate physical quantities of Mie scattering in light scattering measurement technology. An efficient numerical algorithm for computing the light scattering by a coated sphere was proposed. The calculation of relevant functions by different recurrence algorithms was discussed. The new algorithm avoided the numerical difficulties, which gave rise to significant errors encountered in practice by prior methods. The exemplifying results such as extinction efficiency, scattering efficiency and absorbing scattering as well as the calculation speed were provided. The results show that this algorithm is efficient, fast, numerically stable and accurate.

Keywords：coated sphere;Mie scattering; numerical algorithm