Research Of Ultraviolet Light's Scattering Polarization Characteristics Of Haze Particles

In recent years, haze has almost become the "weather" in most of china's urban, which causes environmental pollution and harms the health of the human body. When the "solar blind"ultraviolet light transmits in the atmosphere, the light will be scattered due to the particles in the haze, The polarization information of the scattered light will carry the physical properties (such as particle size parameters, complex refractive index, scale distribution, particle morphology) of the atmospheric haze particles. At the same time , we can effectively invert the haze particles according to the scattered light carries intensity information, spectral information and polarization information, which improves the optical system precision of detection of haze particles. Therefore, the study of the polarization characteristics of scattered light is becoming more and more important.First of all ,the physical parameters of haze particles has been analyzed, and the ultraviolet light scattering polarization theory of haze particles has been described in detail. Then, based on Mie scattering theory, the paper have used the line-of-sight and non-line-of-sight of a single ultraviolet scattering model to analyze. On one hand, the effects of the physical properties of the single and chain-structure spherical particles for the ultraviolet light polarization properties(stokes vector and the degree of polarization) have been investigated. On the other hand, based on Monte Carlo Simulation, the impacts of haze particle concentration on polarization state at a fixed particle size distribution have been discussed. Finally, based on the T-matrix theory, this paper have simulated the effects of the physical parameters of three typical non-spherical haze particles (cylindrical particles, ellipsoid particles and chebyshev particles)on the polarization state of ultraviolet light.Simulation results show that for the spherical haze particles, the change of the particle size and the imaginary part of the complex refractive index have a regular effect on the scattered light intensity(Is) in Stokes vector and the degree of polarization. Besides, the degree of polarization can distinguish whether the chain-structure spherical particles are made up by the same spherical particle.When the physical parameters are a certain range, the change of the scattered Stokes vector of the three typical non-spherical haze particles with the scattering angle is similar, as the same as the change of degree of polarization. For the three typical non-spherical haze particles, the change of the particle size and complex refractive index can very regular influence the polarization state. Meanwhile, the article has been specifically analyzed the effect of the non-spherical particle size on the scattered light Stokes vector Is and Qs and the degree of polarization is the largest when the scattering angle is 10°.