摘要
根据米氏(Mie)理论,计算了多分散球形气溶胶粒子的单次散射特性。粒子的尺寸分布为伽马分布,有效半径分别为5.56,7和11μm,分析了0.4～100μm光谱范围内气溶胶粒子的平均消光系数、平均散射系数、单次散射反照率、不对称因子以及相矩阵与粒子的尺寸参数以及折射率的关系。结果表明,在可见光波段,粒子的有效半径对粒子的散射特性影响较小,在更长的波段上其影响较大;单次散射反照率在可见光范围内近似为1,随波长的变化和水滴折射率虚部随波长的变化曲线正好相反,这说明影响其大小的主要因素为粒子的折射率,即虚部越大则反照率越小;且极化率对粒子的尺寸比相函数更敏感。
Based on Mie theory,the single scattering characteristics of a cluster of polydisperse spherical aerosols are calculated.The size distribution of particles is Gamma distribution and effective radii are 5.56,7,11 μm,respectively.The average extinction coefficients,average scattering coefficients,single scattering albedos,asymmetry parameters and elements of single scattering phase matrix in the spectral range of 0.4~100 μm are analyzed.The numerical results show that the single scattering properties of aerosols are seldom affected by particle effective radius in visual light waveband,but greater at higher waveband.The single scattering albedo approximately equals 1 at visual light waveband and the characteristics of single scattering albedo are opposite to the imagery part of refraction index.The polarization ratios of single scattering phase matrix are more sensitive to particle size than phase functions.
出处
《激光与光电子学进展》
CSCD
北大核心
2011年第2期87-92,共6页
Laser & Optoelectronics Progress
基金
山东省自然科学基金(ZR2009AQ013)资助课题
关键词
散射
相矩阵
气溶胶
米氏理论
scattering
phase matrix
aerosol
Mie theory
