本文阐述了动态光散射测量的基本原理,尝试性地利用动态光散射技术进行了气体中烟气颗粒的粒径测量。利用Brookhaven公司的BI-9000相关器搭建测量平台,探索了动态光散射技术在气体中测量烟气颗粒粒径的方法,分析了在测量中遇到的关键问题,如烟气颗粒浓度、颗粒吸附作用等,并初步提出解决问题的方案。本文先后对两种不同的烟草样本进行实验,两组测量数据表现出明显的差异,同组数据在一定范围内波动,说明了动态光散射在烟气颗粒测量中有一定的应用潜力。

The fundamental theory of Dynamic Light Scattering (DLS) was introduced. Several attempted experiments were done to measure the diameter of smoke particles in gas using DLS measurement. By means of a measurement platform containing BI-9000 digital autocorrelation instrument, which was produced by Brookhaven Instrument Corporation, we explored some possibility ways of measuring smoke particles in gas. Several important issues were analyzed in the process of measuring, e.g. the effect of smoke particles’ concentration, the effect of smoke particles’ adsorption to the sample vessel, etc. And a few useful methods were taken to solve these problems. Two kinds of different cigarettes particles were measured in these experiments. The results of these two samples were different from each other and the results of each sample were fluctuated within a certain range, which denotes the application potential of DLS measurement of smoke particles in gas.