Abstract： To optimize the scattering equipment and inversion algorithm, especially for polydisperse particle systems, based on the theory of three-dimensional Brownian motion and coherent optics, a numerical method of simulating dynamic light scattering signals was developed. The expression of the total intensity of scattered light and normalized autocorrelation function in polydisperse particle systems were derived. The dynamic light scattering intensity from monodisperse particle systems and polydisperse particle systems were simulated. The effect of particle numbers and total sample time on correlation function curves was studied. The results show that the calculated autocorrelation functions of the simulated intensity signals agree well with those of theories, which demonstrates the effectiveness of the numerical method.

Keywords: dynamic light scattering; polydisperse system; Brownian motion; autocorrelation function; signal simulation

中图分类号：O436.2          文献标志码：A

文章编号：1008-5548（2014）06-0028-06

DOI:10.13732/j.issn.1008-5548.2014.06.007

收稿日期：2014-04-08， 修回日期：2014-04-14，在线出版时间：2014-12-22。

基金项目：国家自然科学基金项目，编号：61371176；广东省自然科学基金项目，编号：S2013010013699。

第一作者简介：朱苏皖（1989—），男，硕士研究生，研究方向为光电技术及系统。 E-mail: rongwinnie@163.com。

通信作者简介：韩鹏（1976—），男，博士，教授，博士生导师，研究方向为光电技术及系统。 E-mail:hanp@scnu.edu.cn。