混合层折射率对核壳冰晶散射特性影响研究

Influence of the refractive index of mixed layer on the scattering characteristics of core-shell ice crystals

为进一步研究冰晶粒子的激光散射特性,建立了考虑中间混合层的多层核壳冰晶粒子结构模型,给出了均匀混合介质层的折射率计算式。展开讨论了0.86μm、1.06μm两波长下,中间混合层厚度、粒子尺寸大小等对烟煤-冰晶、烟煤-冰晶-水雾两种特殊核壳结构冰晶粒子散射特性的影响。数值结果表明:与理想的核壳结构冰晶粒子相比,考虑中间混合层的核壳结构冰晶粒子的散射强度较小,随着核壳结构冰晶粒子分层数的增多,散射特性差异增大。散射强度与粒子尺寸成正比,且随着粒子尺寸的增大,核壳结构冰晶粒子散射光的方向性增强,散射光强随散射角度的分布越复杂。

In order to further study the laser scattering characteristics of ice crystals,a multi-layer core-shell ice crystal structure considering the intermediate mixed layer was established.The calculation formula of the intermediate mixed layer refractive index related to the medium parameters was given.The two kinds of special core shells of soot coal-ice crystal,soot coal-ice crystal-water are discussed the effect of structural ice crystal particle scattering characteristics,under the two wavelengths of 0.86μm and 1.06μm,The numerical results show that compared with the ideal core-shell ice crystals,the scattering intensity of the ice-shells in the core-shell structure of the intermediate mixed layer is small,and the scattering characteristics increase with the increase of the number of stratification of the ice-shells in the core-shell structure.The scattering intensity is proportional to the particle size,and as the particle size increases,the directionality of the ice-shell scattering of the core-shell structure increases,and the distribution of the scattered light intensity with the scattering angle is more complicated.