切比雪夫雾霾粒子的紫外光散射偏振特性研究

雾霾天气已严重影响人们的日常生活，通过检测雾霾粒子的紫外光散射偏振特性可以有效分析雾霾成因。矿物粒子、灰尘粒子等雾霾颗粒均有小规模表面粗糙度的形态学特征，因此可用切比雪夫粒子作为模型分析。“日盲”紫外光与切比雪夫雾霾粒子相互作用发生散射，散射光偏振特性可反演切比雪夫雾霾颗粒物理性质(如粒子尺寸参数、复杂折射率、粒子形变、波纹参数)。采用紫外光单次散射模型和T矩阵方法，仿真分析切比雪夫雾霾粒子物理参数与散射光偏振特性(Stokes矢量和偏振度)之间的关系，结果表明：粒径对散射光Stokes矢量Is和Qs随散射角的变化趋势影响很大，粒子的粒径和复杂折射率虚部的变化会造成散射光偏振度随散射角的变化趋势的改变；具体分析散射角度为10°时，得到粒径对Is和Qs的数值影响最大，当粒径r<1 μm时，Is随粒径呈现抛物线趋势；切比雪夫粒子形变的增大，Is呈现先增大后减小的趋势。

The Study of Polarization Characteristics of Ultraviolet Light Scattering from Chebyshev Haze Particles

Haze has seriously affected the people’s daily life. By detecting the polarization information of the scattered ultraviolet light of haze particles, the causes of haze can be effectively analyzed. Small-scale surface roughness is a morphological feature that is obtained from mineral and dust particles in haze, therefore Chebyshev particle modelcan be used to knowthe haze particles. The “solar blind” ultraviolet light will be scattered due to the Chebyshev haze particles. The polarized properties of the scattered light can invert the physical properties (such as particle size parameters, complex refractive index, particle deformation, ripple parameter) of the Chebyshev haze particles. This paper has used the ultraviolet single scattering model and T matrix method to analyze the relationship between the physical properties of Chebyshev haze particles and the ultraviolet light polarization properties (Stokes vector and the degree of polarization). The results show that the particle size has a great influence on the change trend of the scattered Stokes vectorIsand Qs with the scattering angle. The change of the particle size and the imaginary part of the particle complex refractive index caused the degree of polarization the scattered light changed with the scattering angle. Meanwhile, the article has been specifically analyzed the effect of the Chebyshev particle size on the scattered light Stokes vector Is and Qs is the largest when the scattering angle is 10°. And when particle size r<1 μm, the change of Is with particle size shows a parabolic trend. When the deformation of the Chebyshev particle isincreased, the scattered Stokes vectorIspresents increased initially and then decreased.