复杂成分内混合体光散射等效性分析的判据选取

使用离散偶极子近似算法DDSCAT7.1与米散射理论算法MIEV0研究复杂成分混合体等效性时, 由于两者为不同的原理和实现算法, 考察DDSCAT7.1和MIEV0所计算出的相同光学量的相对偏差将非常必要。通过比较两种算法所计算出的球形散射型粒子海盐和吸收型粒子含碳气溶胶的光学量的相对偏差, 结果表明: 两种算法所计算的非散射角函数光学量的相对偏差较小; 在瑞利散射区, 散射相矩阵分量M1和S21的相对偏差较小, 而M2和D21只在一定的散射角范围内相对偏差较小; 在米散射区, M1、M2、S21在有限的散射角范围内相对偏差较小, 而D21的相对偏差则普遍较大。在光散射等效性判据选取时, 非散射角函数光学量适合用来研究内混合体的等效性, 而散射相函数则不太适合用来研究内混合体等效性, 除非综合考虑粒子尺度参数以及选择合适的散射角等因素。在光散射技术中对粒子谱分布和折射率相当敏感的D21, 比较难以用在以两种方法为基础的内混合体等效性研究中。

Parameter Selection of Light-Scattering Equivalence for Complex Internal-Mixed Particles

It is necessary to investigate the relative deviations of optical parameters calculated by DDSCAT7.1 and MIEV0 when studying the light-scattering equivalence of internal-mixed particles based on both arithmetics.It is founded that the relative deviations of optical parameters which are not the function of scattering angle are small.The relative deviations of M2 and D21 in certain scattering angles,and M1 and S21 are also small in Rayleigh-scattering range.The relative deviations of M1,M2 and S21 are smaller in limited scattering angles while those of D21 are generally larger in Mie-scattering range.The optical parameters which are not the function of scattering angle are suitable for the equivalence study while the scattering phase function is not suitable.If the size parameters and limited scattering angles are considered comprehensively,the scattering phase function can be used partly.However,D21 still can not be used for the light-scattering equivalence based on both arithmetics.