大气与环境光学学报, 2019, 14 (5): 321, 网络出版: 2019-10-14  

气溶胶单粒子的偏振散射特性研究

Investigation of Polarization Scattering Characteristics of Single Particle Aerosols
作者单位
1 中国科学院安徽光学精密机械研究所环境光谱实验室 安徽 合肥 230031
2 中国科学技术大学, 安徽 合肥 230026
摘要
建立了气溶胶单粒子的偏振散射实验装置,采用T-matrix方法模拟球形粒子和长形粒子的光散射计算, 讨论了偏振强度因子(Pf)和穆勒矩阵元素(Z11、Z12)随粒径、形状的变化关系,结果表明,球形 粒子和杆状粒子的Pf和Z12随着粒径的增大存在明显差异。通过对单分散的气溶胶颗粒 物样品的实验测量,得到不同样品的Pf值和Z12。实验结果表明,以油酸粒子的Z12为基准, 差值ΔZ12=12可以作为球形的油酸粒子和长形的核黄素以及石棉纤维的区分阈值, ΔZ12 介于12~41主要为核黄素粒子, ΔZ12达到59时粒子可被认为是长形的石棉纤维粒子, 而立方形的NaCl气溶胶粒子的ΔZ12与油酸粒子非常接近,难以区分。初步实验表明,穆勒矩阵 元素Z12可以用于识别长形粒子,该研究为颗粒物形态的偏振测量提供依据。
Abstract
An experimental device for the polarization scattering of aerosol single particles is developed. The T-matrix method is used to simulate the light scattering calculation of spherical particles and long particles. The relationship between polarization intensity factor (Pf), Müller matrix elements (Z11 and Z12) with particle size and shape is discussed. The results show that, with the increase of particle size, there are significant differences between spherical particles and rod-shaped particles in parameters Pf and Z12. By experimental measurement, Pf values and Z12 of different samples are obtained. The experimental results show that, using the Z12 of oleic particles as the reference, the difference ΔZ12=12 can be used as the distinguishing threshold for spherical oleic acid particles and ellipsoidal riboflavin particles and long asbestos fibers particles. The ΔZ12 of riboflavin particles ranges from 12 to 41, and when ΔZ12 reaches 59, the particles can be considered as asbestos fiber particles. However, it’s hard to distinguish cubic NaCl particles and oleic acid particles because the values Z12 of each are very similar. Preliminary experiments show that Müller matrix element Z12 can be used to identify long particles, which can help to design morphology measurement instrument with polarization method.

陈旭, 丁蕾, 王颖萍, 郑海洋, 方黎. 气溶胶单粒子的偏振散射特性研究[J]. 大气与环境光学学报, 2019, 14(5): 321. CHEN Xu, DING Lei, WANG Yingping, ZHENG Haiyang, FANG Ll. Investigation of Polarization Scattering Characteristics of Single Particle Aerosols[J]. Journal of Atmospheric and Environmental Optics, 2019, 14(5): 321.

关于本站 Cookie 的使用提示

中国光学期刊网使用基于 cookie 的技术来更好地为您提供各项服务,点击此处了解我们的隐私策略。 如您需继续使用本网站,请您授权我们使用本地 cookie 来保存部分信息。
全站搜索
您最值得信赖的光电行业旗舰网络服务平台!