本文针对高浓度散射介质, 用低相干光纤动态光散射技术测量浓悬浮液中多分散颗粒系的粒径及其粒径分布。利用迭代CONTIN算法对实验数据进行反演运算, 得到多分散颗粒系的粒径分布结果。结果表明, 浓悬浮液中多分散颗粒系的峰值粒径测量值与给定的两种标准粒径值相吻合, 其误差在4%之内, 粒径分布曲线中各散射颗粒所反映的散射体光强分布与根据Mie散射计算得到的理论值相吻合。实验结果证明低相干光纤动态光散射实验系统能准确测量浓悬浮液中多分散颗粒粒径及粒径分布。

The particle size distribution of polydisperse polystyrene latex suspensions were measured by use of low-coherence fiber optic dynamic light scattering. An improved iterative CONTIN algorithm is used to obtain the particle size distributions from the experimental data. The results showed that for concentrated polydisperse suspensions, the mean particle sizes are in good agreement with the given standard values with the accuracy approximately 4%. The proportion of weighted intensity of scattering light presented by particle size distribution curves are in good agreement with the theoretical values which calculated from Mie theory. It was confirmed that the low-coherence fiber optic dynamic light scattering technique can measure the particle size and size distribution well for concentrated polydisperse suspensions.