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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。
In order to measure the radius of microsphere particles efficiently, economically and accurately, a measuring device was designed based on Mie scattering theory. In this paper, the theory of Mie scattering theory is used to analyze the light scattering properties of microspheres. The relationship between the scattered light distribution and the wavelength of incident light, the radius of the microspheres and the relative refractive index of the microspheres is obtained. The results show that the smaller the incident light wavelength is, the more distributed the scattered light energy is in the range of smaller scattering angle. The relative refractive index has little effect on the scattered light distribution. The distribution of the scattered light intensity of the different radius particles is quite different Therefore, the radius of microsphere particles can be determined by measuring the distribution of scattered light, and the feasibility of this design scheme is proved theoretically. Based on theoretical analysis and calculation results, a device for measuring the radius of microsphere particles was designed. The device has the advantages of simple structure, low cost and high efficiency. It can be used in practical measurement and has certain practicality.