基于Mie散射理论的微球体颗粒半径分析

Analysis of the radius of microsphere particles based on Mie scattering theory

为高效、经济、准确地对微球体颗粒的半径进行测量,基于Mie散射理论设计了一种测量装置。本文应用Mie散射理论对微球体颗粒光散射的性质进行了理论分析与数值计算,得出了散射光分布与入射光波长、微球体颗粒半径以及微球体相对折射率之间的关系。结果表明:入射光波长越小,散射光能量越集中分布在散射角较小的范围内;相对折射率的变化对散射光分布的影响不大;不同半径颗粒的散射光强的分布差异较大,因此通过测量散射光的分布可以确定微球体颗粒的半径,从理论上证明了该设计方案的可行性。结合理论分析与计算结果设计了一种用于测量微球体颗粒半径的装置,该装置具有结构简单、成本低、效率高等优点,可以用于实际测量,具有一定的实用性。

To measure the radius of microsphere particles effectively, economically and accurately,the Mie scattering theory is adopted to design the radius measuring device.The theoretical analysis and numerical calculations of microsphere particle light scattering characteristics are carrying out by using Mie scattering theory.Moreover, the relations of the distribution of scattering light and incident wavelength, the radius of microparticle and the relative index of the microsphere particle are presented. Three results are obtained.Firstly, the energy of scattering light distributes in the area where scattering angle is small when the incident wavelength is small.Secondly, the variety of the relative index has little effect on the distribution of scattering light.Thirdly, the distributions of scattering light have great difference according to different radiuses of microsphere particle,so that the radius of the microsphere particle could be obtained by measuring the distribution of the scattering light,therefore,the feasibility of the design scheme is proved theoretically.The radius measuring device for microsphere particles is designed based on theoretical analysis and numerical calculations.The device has the merits of simple structure,low cost and high efficiency.The device is practical and could be adapted to practical measurement