Phillips D T, Wyatt P J
Appl Opt. 1972 Sep 1;11(9):2082-7. doi: 10.1364/AO.11.002082.
The use of single-particle light-scattering measurements to determine the origin of atmospheric hazes has been explored by measurement of laboratory aerosols, field samples, and computer analysis of the light-scattering data. The refractive index of measured spherical particles 800 nm to 1000 nm in diameter was determined within 2%. For particles of diameter less than 500 nm the measurement of absolute scattering intensity is required for complete analysis. Distinctive nonspherical and absorbing particles were observed both in automotive exhaust and atmospheric samples. Electrostatic suspension of atmospheric particulates is demonstrated to provide a practical approach to optical measurement of single particles. The technique may be used to calibrate optical particle counters or identify particles with unique shape or refractive index.
通过对实验室气溶胶、现场样本进行测量以及对光散射数据进行计算机分析，探索了利用单粒子光散射测量来确定大气霾的来源。所测量的直径在800纳米至1000纳米之间的球形颗粒的折射率测定误差在2%以内。对于直径小于500纳米的颗粒，为了进行完整分析，需要测量绝对散射强度。在汽车尾气和大气样本中均观察到了独特的非球形和吸收性颗粒。事实证明，大气颗粒物的静电悬浮为单粒子的光学测量提供了一种实用方法。该技术可用于校准光学粒子计数器或识别具有独特形状或折射率的颗粒。
