反演含包体气溶胶颗粒折射率的各种平均场公式的比较

Kristin S. Dooley, J. DeYoung
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引用次数: 0

摘要

介绍了有效介质近似(EMA)方法在双组分系统中的应用。研究的系统由水、硫酸盐、烟灰和灰尘组成,因为这些是常见的大气气溶胶成分。大气模型通常使用电磁辐射来包括内部混合的气溶胶,而不需要精确理论的计算负担。在目前的工作中,几种类型的混合规则(Maxwell-Garnet, Bruggeman和coherent势近似)已经应用于各种双组分内部混合粒子,在550 nm使用小于0.1的小组分的体积分数。正如预期的那样,结果表明测试的配方产生非常相似的有效折射率,表明在测试的体积分数下,夹杂物之间的电场相互作用可以忽略不计。这表明成分折射率的差异对测试体积分数下EMA的有效性只有很小的影响。在所有考虑的情况下,两个分量的折射率的线性平均值提供了电磁辐射的上限。
本文章由计算机程序翻译,如有差异,请以英文原文为准。
Comparison of Various Mean Field Formulations for Retrieving Refractive Indices of Aerosol Particles Containing Inclusions
Application of effective medium approximation (EMA) methods to two-component systems are presented. Systems studied are composed of water, sulfate, soot, and dust as these are commonly encountered atmospheric aerosol components. Atmospheric models often employ EMAs to include internally mixed aerosols without the computational burden of exact theory. In the current work, several types of mixing rules (Maxwell-Garnet, Bruggeman, and coherent potential approximation) have been applied to various two-component internally mixed particles at 550 nm using volume fractions of the minor component below 0.1. As expected, results show that the formulations tested produce very similar effective refractive indices indicating that electric field interactions between inclusions is negligible at the tested volume fractions. This indicates that the differences in component refractive index has only a minor effect on the validity of the EMA at the tested volume fractions. In all cases considered, the linear average of the refractive indices of the two components provides an upper limit for the EMAs.
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