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Size distribution of mineral aerosol: using light-scattering models in laser particle sizing

机译:矿物气溶胶的尺寸分布:在激光粒度分析中使用光散射模型

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摘要

The size distribution of semitransparent irregularly shaped mineral dust aerosol samples is determined using a commonly used laser particle-sizing technique. The size distribution is derived from intensity measurements of singly scattered light at various scattering angles close to the forward-scattering direction at a wavelength of 632.8 nm. We analyze the results based on various light-scattering models including diffraction theory, Mie calculations for spheres with various refractive indices, and T-matrix calculations for spheroidal particles. We identify systematic errors of the retrieved size distribution when the semitransparent and nonspherical properties of the particles are neglected. Synthetic light-scattering data for a variety of parameterized size distributions of spheres and spheroids are used to investigate the effect of simplifying assumptions made when the diffraction model or Mie theory is applied in the retrieval.
机译:半透明不规则形状的矿物粉尘气溶胶样品的尺寸分布是使用常用的激光粒度分析技术确定的。尺寸分布是从在632.8 nm波长处接近前向散射方向的各个散射角的单个散射光的强度测量得出的。我们基于各种光散射模型来分析结果,这些模型包括衍射理论,具有各种折射率的球体的Mie计算以及球状粒子的T矩阵计算。当忽略了粒子的半透明和非球形特性时,我们确定了检索到的尺寸分布的系统误差。球形和椭球形的各种参数化大小分布的合成光散射数据用于研究简化衍射模型或Mie理论应用于检索时所作假设的效果。

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