Precise size distribution measurement of aerosol particles and fog droplets in the open atmosphere
Precise size distribution measurement of aerosol particles and fog droplets in the open atmosphere
复制标题
大气中气溶胶颗粒和雾滴的精确尺寸分布测量
DOI：
10.1364/oe.27.00a890
复制
发表时间：
2019-06-10
期刊：
影响因子：
3.8
通讯作者：
Hua, Dengxin
中科院分区：
文献类型：
--
作者：
Di, Huige;Wang, Zhixiang;Hua, Dengxin
本文提出了一种在开放大气中同时精确测量气溶胶粒子谱和雾滴谱的方法。将消光系数测量和小角度前向散射测量结合到大气颗粒物粒径分布的检测中，实现了对大气中半径在0.1 ~ 30 Ant之间的颗粒物的精细检测。详细讨论并解决了小角度前向散射测量中的最佳散射角和最佳波长选择等关键技术。使用包括气溶胶尺寸分布和雾滴尺寸分布的十四种不同的颗粒尺寸分布来确定最佳前向散射角和波长。最佳前向散射角计算为1.1度。在测量过程中，选择了7个消光系数波长和5个前向散射系数波长来反演颗粒的粒度分布。本文介绍了用正则化方法反演颗粒粒径分布的光学参数。利用粒子谱仪测量的气溶胶粒子谱分布和实际雾粒子谱分布进行了方法试验和粒子谱重建。反演结果表明，该方法可以实现气溶胶粒子谱和雾滴谱的精确测量。讨论了误差对分布反演结果的影响。在对反演结果进行灵敏度分析的基础上，分析讨论了在真实的大气中进行测量的可行性，并提供了探测系统的方案。(C)根据OSA开放获取出版协议的条款，2019年美国光学学会
A precise measurement for the aerosol particle size distribution and fog droplet size distribution simultaneously in the open atmosphere is proposed. The extinction coefficient and small-angle forward scattering measurement are integrated into the detection for particle size distribution in the open atmosphere, and can achieve the fine detection of the particles in the atmosphere with radius between 0.1 to 30 Ant The key technology including optimal scattering angle in small-angle forward scattering measurement and optimal wavelengths selection are discussed and solved in detail. The fourteen different particle size distributions including aerosol size distributions and fog droplet size distributions are used for the determination of optimal forward scattering angle and wavelengths. The optimal forward scattering angle is calculated to be 1.1 degrees. Seven wavelengths for extinction coefficients and five wavelengths for forward scattering coefficients are chosen for the retrieval of particle size distribution in the measurement. The regularization inversion of optical parameters for the retrieval of particle size distribution is described. The aerosol particle size distributions measured by particle spectrometer and actual fog particle size distributions are used for the method test and the reconstructions of particle size distributions. The inversion results show that the method can achieve the precise measurements of aerosol particle size distribution and fog droplet size distribution. The error influence on the inversion results of distributions is discussed. Based on the sensitivity analysis of inversion results, the feasibility of measurement in the real atmosphere is analyzed and discussed, and the scheme of detection system is provided. (C) 2019 Optical Society of America under the terms of the OSA Open Access Publishing Agreement