提出了基于线阵CCD相机的动态散斑对比度颗粒测量方法和系统,用于解决动态光散射研究涉及的动态光散射软件相关算法运算量大、实时性较差,以及不能测量高黏度溶液中颗粒的问题。首先,从传统动态光散射理论出发,基于光学统计理论,建立了动态散斑对比度的模型。然后,根据Siegert公式,推导了动态散斑对比度与动态散射光场自相关函数的关系。最后,得到了低浓度和高浓度下动态散斑对比度与颗粒粒径的关系。分别对粒径分布为(490±20) nm的标准乳胶球颗粒水溶液和纳米二氧化钛粉体(粒径分布：450~500 nm)甘油溶液进行了测量。结果表明：动态散斑对比度测量法的运算量小,且能测量高黏度溶液中的纳米颗粒,重复测量误差小于2%,满足了动态光散射的国标要求。

A new measuring method and a measuring system for particle sizes based on the contrast of dynamic laser speckles were proposed by using a linear CCD camera. It was used to overcome the larger operation calculation and poor real time ability of the Dynamic Light Scattering (DLS) software and to solve the problem that the classic DLS could not measure the particles in high viscosity solution. Firstly, a model for the contrast of dynamic laser speckles was established based on the optical statistical theory and the classic DLS theory. Then, the relationship between the contrast of dynamic laser speckle and the autocorrelation function of dynamic light scattering was derived according to the Siegert formulation. Finally, the relationships between the contrast of dynamic laser speckle and the particle size in low and high concentrations were established. With the proposed method, aqueous latex spheres with diameter distribution of (490±20) nm and nano titanium dioxide powder glycerol solution with diameter distribution of 450-500 nm were measured under high and low concentrations. The results show that the proposed method not only has a small amount of computation, but also is able to measure the nanoparticles in the high viscosity solution. The measurement repeatability error of the new method is less than 2%, which satisfies the needs of national standard for dynamic light scattering.