Abstract We describe a robust, portable, deployable instrument for multiparametric optical characterization of single airborne particles. It is based on the Single Particle Extinction and Scattering method with additional sensors at 45° and 90° angles. Four independent optical parameters are associated to each particle. Basically, it provides a rigorous measurement of the extinction cross section and the complex amplitude of the forward scattered field. Moreover, thanks to the multiparametric single particle approach, it is possible to roughly classify the particles within a size range from a few hundreds of nanometers to some micrometers. By assigning a reasonable single scattering albedo for each population, our data are enough to fit the phase function with acceptable uncertainties. We report here the results of tests performed with water droplets, generating well controlled data without any free parameters. Data analysis is described in detail. We also report measurements performed on urban aerosol collected in the city of Milan by recovering the optical properties and feeding radiative transfer models. The findings reported here support the importance of an accurate measurement of the phase function, as already established by the Community. Copyright © 2020 American Association for Aerosol Research

中文翻译：

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具有单粒子消光和散射的空气尘埃多参数光学表征

摘要 我们描述了一种坚固、便携、可部署的仪器，用于单个空气传播颗粒的多参数光学表征。它基于单粒子消光和散射方法，带有 45° 和 90° 角的附加传感器。四个独立的光学参数与每个粒子相关联。基本上，它提供了对前向散射场的消光截面和复振幅的严格测量。此外，由于采用了多参数单粒子方法，因此可以在几百纳米到几微米的尺寸范围内对粒子进行粗略分类。通过为每个群体分配合理的单次散射反照率，我们的数据足以以可接受的不确定性拟合相位函数。我们在这里报告了使用水滴进行的测试结果，生成了没有任何自由参数的良好控制的数据。详细描述了数据分析。我们还报告了通过恢复光学特性和馈送辐射传输模型对在米兰市收集的城市气溶胶进行的测量。此处报告的结果支持准确测量相位函数的重要性，正如社区已经建立的那样。版权所有 © 2020 美国气溶胶研究协会 此处报告的结果支持准确测量相位函数的重要性，正如社区已经建立的那样。版权所有 © 2020 美国气溶胶研究协会 此处报告的结果支持准确测量相位函数的重要性，正如社区已经建立的那样。版权所有 © 2020 美国气溶胶研究协会