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基于Mie散射理论和方法,研究了航天器尾喷焰等离子体中Al2O3粒子的光学散射特性,分析了复折射率对单个Al2O3粒子消光效率因子、散射效率因子、吸收效率因子、散射相函数以及单次反照率的影响。同时,基于多分散系粒子尺度单峰分布,分析了Al2O3粒子按粒径分布后散射场的有关效应因子及散射相函数的变化,并进行了相应的数值模拟。理论和数值模拟研究表明,航天器尾喷焰等离子体Al2O3粒子复折射率的虚部和实部、粒径的大小与分布对其散射相函数、消光和散射效率因子以及单次反照率均有明显的影响。

Light scattering characteristics of Al2O3 tail plume plasmas for a spacecraft

Based on the Mie’s scattering theory, the light scattering characteristic of Al2O3 tail plume plasma for a spacecraft was studied. Influences of the complex refractive index onthe extinction efficiency factor, scattering efficiency factor, absorb efficiency factor, scattering phase function and the single-scattering albedo of an Al2O3 particle were analyzed by using the Mie’s scattering theory. Meanwhile, based on the particle scale unimodal distribution with a polydispersity, the changes of the concerned effect factors and the scattering phase function were analyzed with considering the Al2O3particle size, and some numerical simulations were also given. The theoretical and numerical simulation studies show that the imaginary and real part of the refractive index of the Al2O3 particles, the radius and its distribution of the particles bring out great effect on the scattering phase function, extinction and scattering efficiency factors and single-scattering albedo.