非球形气溶胶粒子光散射特性的仿真分析

发布时间：2018-10-25 14:19

【摘要】：基于DDA法研究了复折射率、粒子形状和尺度参数对非球形气溶胶光散射特性的影响。仿真结果表明,气溶胶粒子的消光效率因子和散射效率因子随尺度参数增加呈减幅振荡。当复折射率实部增加时,消光效率因子和散射效率因子的振荡周期减小,而吸收效率因子略微增加;当复折射率虚部增加时,散射效率因子的振荡幅值和振荡中心值减小,而吸收效率因子显著增加。复折射率虚部增大时,椭球气溶胶粒子群的雷达比增大,退偏比减小。在近瑞利散射区,粒子形状对粒子的光散射特性影响较小,在米散射区时,粒子光散射特性与粒子形状密切相关。消光效率因子和散射效率因子随尺度参数变化的振荡幅值、周期和中心值一定程度上也反映了椭球形气溶胶粒子的非球形特征。
[Abstract]:Based on the DDA method, the effects of complex refractive index, particle shape and size parameters on the light scattering properties of non-spherical aerosols are studied. The simulation results show that the extinction efficiency factor and scattering efficiency factor of aerosol particles oscillate with the increase of scale parameters. When the real part of complex refractive index increases, the oscillation period of extinction efficiency factor and scattering efficiency factor decreases, while the absorption efficiency factor increases slightly, while the oscillation amplitude and oscillation center value of scattering efficiency factor decrease when the imaginary part of complex refractive index increases. The absorption efficiency factor increased significantly. When the imaginary part of complex refractive index increases, the radar ratio of ellipsoid aerosol particle swarm increases and the depolarization ratio decreases. In the near Rayleigh scattering region, the shape of particles has little effect on the light scattering characteristics of particles. In the area of meter scattering, the light scattering characteristics of particles are closely related to the shape of particles. The oscillation amplitude, period and center value of extinction efficiency factor and scattering efficiency factor with scale parameters also reflect the non-spherical characteristics of ellipsoid aerosol particles to some extent.
【作者单位】：西安理工大学机械与精密仪器工程学院;
【基金】：国家自然科学基金资助项目(61405158)
【分类号】：O436.2;X513

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