红外波段气溶胶粒子光学特性的数值计算

气溶胶是大气电磁环境中的重要组成部分,气溶胶粒子的光学特性是研究红外遥感、目标探测等激光传输特性的一个关键问题。依据粒子电磁散射理论,利用离散偶极子近似方法对不同形状、不同成分气溶胶粒子的光学特性进行计算,得到气溶胶粒子散射截面、吸收截面及不对称因子等光学特征量在0.71～11μm波段的数值结果。结果显示:入射光波长、气溶胶粒子折射率及气溶胶粒子形状是影响气溶胶粒子光学特性的主要因素。散射截面、吸收截面及不对称因子等光学特征量的数值结果也为研究气溶胶中红外激光的传输特性提供了参考依据和计算方法。

Numerical calculation of aerosol optical properties based on infrared band

The aerosol is an important ingredient of atmospheric electromagnetic environment.Its optical properties is a key issue in the research of characteristics of laser propagation with infrared remote sensing and laser detector.After the calculation of optical properties of the different shape and component aerosol particles,the numerical result of scattering cross section,absorption cross section and asymmetry factor of aerosol particles was obtained based on 0.71-11 μm waveband with the discrete dipole approximation method,which was in accordance with the particle electromagnetic scattering theory.The result shows that the incident wavelength,reflective index and shape of aerosol particles are principal factors affecting optical properties of aerosol particles.The numerical result of scattering cross section,absorption cross section and asymmetry factor of aerosol particles provides a reference and calculation approach for the research of transfer-characteristics of infrared laser propagating in aerosols.