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数字相关技术是纳米颗粒测量技术中的一个关键环节,自相关函数的估计质量直接影响颗粒测量结果。PCS理论较为复杂,数据运算量大,因此实现较为困难。文中介绍光子相关光谱法的基本原理,讨论数字相关器的内部结构,最后提出实现数字相关器的新方法,该方法计算精度较高,系统实现灵活,满足对光子相关光谱法中相关函数计算的高精度、实时性的要求。
Digital correlation technology is a key part of nanoparticle measurement technology. The estimated quality of autocorrelation function directly affects the particle measurement results. The theory of PCS is more complex and the data is more computationally intensive, so it is more difficult to realize. In this paper, the basic principle of photon correlation spectroscopy is introduced, and the internal structure of digital correlator is discussed. Finally, a new method to realize digital correlator is proposed. The method has high computational accuracy and flexible system, and satisfies the calculation of correlation function in photon correlation spectroscopy High-precision, real-time requirements.