【摘要】 在已知大气气溶胶折射率和气溶胶谱分布的基础上,对近红外波段的气溶胶消光特性进行了研究。利用Mie散射理论计算并讨论了气溶胶的消光、散射、吸收效率因子随尺度参数的变化和消光系数随半径和波长的变化,并且在MATLAB中对各种变化情况进行了仿真。结果表明,三种气溶胶粒子的消光和散射能力依次为沙尘性粒子,水溶性粒子,烟煤。消光系数在粒子半径和入射波长相近时达到最大,并且粒子半径对消光、散射、吸收系数的影响比入射波长更明显。这些结论可以为红外辐射在大气中的衰减计算和分析提供依据。更多还原

【Abstract】 Based on the refractive indices of atmospheric aerosols and the measured values of aerosol size distribution,aerosol extinction characteristics have been studied in Near-infrared bands.The paper uses Mie scattering theory to calculate and analyze the characteristics of the extinction efficiency,scattering efficiency,absorption efficiency and extinction coefficient with various aerosols radius and wavelength,which is simulated with MATLAB.The results show that the scattering capability lines in order as such:the dust aerosol,the dissolvable particle and the smoke aerosols.Extinction coefficient of the particle is the biggest when the radius is close to the incident wavelength,and the impact of the particle radius on the extinction,scattering,absorption coefficient is more severe than the incident wavelength.These results can provide reference for calculating and analyzing the attenuation of infrared radiation in the atmosphere.更多还原