大气气溶胶相对湿度影响碳黑团聚物辐射特性分析

发布时间：2018-05-26 20:54

本文选题：大气光学 + 辐射特性　；参考：《光学学报》2017年05期

【摘要】：基于分形理论生成了高、低相对湿度下典型形态包覆水层碳黑团聚物,分析了大气气溶胶相对湿度与碳黑粒子等效折射率和半径之间的关系,得出包覆水层碳黑粒子半径随相对湿度的增加而显著增大的结论。采用Coat-Mie理论验证了利用Maxwell-Garnett(MG)理论结合T矩阵(MG-T)的方法计算包覆水层碳黑粒子辐射特性的准确性,且采用Coat-Mie理论和MG-T方法得到的计算结果吻合较好。利用MG-T方法计算了两种典型形态包覆水层碳黑团聚物红外波段的辐射特性,结果表明,随着相对湿度增大,密实状团聚物的辐射特性值远大于枝节状团聚物的辐射特性值;当空气湿度大于50%时,水层厚度的增加使得碳黑团聚物粒子半径增大,从而两形态碳黑团聚物辐射特性值均显著增大,碳黑粒子半径的增大是使得其团聚物辐射特性显著增大的主要因素。
[Abstract]:Based on fractal theory, typical carbon black aggregates in water layer with high and low relative humidity were generated. The relationship between atmospheric aerosol relative humidity and the equivalent refractive index and radius of carbon black particles was analyzed. It is concluded that the radius of carbon black particles increases with the increase of relative humidity. The Coat-Mie theory is used to verify the accuracy of the method of Maxwell-Garnett MG combined with T-matrix MG-T) in calculating the radiation characteristics of carbon black particles in the coated water layer. The results obtained by using Coat-Mie theory and MG-T method are in good agreement with each other. MG-T method was used to calculate the infrared radiation characteristics of carbon black aggregates in two typical water layers. The results showed that the radiation characteristics of dense aggregates were much larger than those of branch aggregates with the increase of relative humidity. When the air humidity is greater than 50, the radius of the carbon black aggregate particles increases with the increase of the water layer thickness, and the radiation characteristics of the two forms of carbon black aggregates increase significantly. The increase of the radius of carbon black particles is the main factor that makes the radiation characteristics of the agglomerates increase significantly.
【作者单位】：哈尔滨理工大学测控技术与通信工程学院;
【基金】：国家自然科学基金(51206038)
【分类号】：X513

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