We demonstrate a method of classifying aerosol particles with different shapes based on the two separated vertical and horizontal polarized beams spaced by 90-100 µm. Model 3321 Aerodynamic Particle Sizer Spectrometer (APS3321) was used to set up an experimental apparatus to test aerosol samples of different shapes, such as spherical oleic acid droplets and elongated crystallized riboflavin. The receiver operating characteristic (ROC) curve was applied to analyze the discrimination ability of the difference in light-scattering intensity to samples with different shapes in the different particle size ranges. The results show that under our experimental conditions, for spherical particles and elongated particles, the distribution trend of the P_f parameter defined by ourselves are different in each particle size range, and the difference between the two particles in the smaller particle size range (about less than 1 µm) seems to be greater than that in the larger one. The relationship between the difference in light-scattering intensity and the elements of the Muller matrix was deduced theoretically. On this basis, the difference in light-scattering intensity of particles with different shapes was calculated by T-matrix. The calculation results show that the method can distinguish spherical and elongated particles well in a certain range of particle sizes (it's approximately 0.3-1.0 µm in diameter). The good agreement between the experimental results and the theoretical calculations indicate the feasibility of the polarized light illuminated scattering characteristics of single airborne particle combined with aerodynamic size information as a new method for aerosol particle shape rapid discrimination.

我们演示了一种基于间隔为90-100 µm的垂直和水平偏振光束的分离方法，对具有不同形状的气溶胶颗粒进行分类的方法。使用3321型空气动力学粒度仪（APS3321）来建立实验设备，以测试不同形状的气溶胶样品，例如球形油酸滴和细长的结晶核黄素。运用接收器工作特性（ROC）曲线来分析光散射强度差异对不同粒径范围内不同形状的样品的辨别能力。结果表明，在我们的实验条件下，对于球形颗粒和细长颗粒，P _f的分布趋势由我们自己定义的参数在每个粒径范围内都不同，并且在较小粒径范围内（约小于1 µm）的两个颗粒之间的差异似乎大于在较大粒径范围内的两个颗粒之间的差异。从理论上推导了光散射强度差与穆勒矩阵元素之间的关系。在此基础上，通过T矩阵计算出不同形状的颗粒的光散射强度差异。计算结果表明，该方法可以在一定粒径范围内（直径约为0.3-1.0 µm）很好地区分球形和细长颗粒。