纳米颗粒光子相关测定中基线方法对测量结果的影响

从光场自相关函数(Autocorrelation Function,ACF)与光强ACF、衰减率分布函数的关系，推导了基线值对有效直径、分散度的影响.分析了决定基线值取值的两种基线方法，指出基线方法不同，基线值也会不同.对三种纳米颗粒样品的相关实验也证明基线值越大，颗粒的有效直径、分散度越小.分析了自动斜率法的测量结果较稳定的原因.

The Effect of Baseline Methods on the Measurement Results of Nano-Particles in Photon Correlation Analysis

According to the relation between the normalized light field autocorrelation function (ACF) and the intensity ACF and the decay rate distribution function, the effect of baseline values on the effective diameter and polydispersity of nano-particles was analyzed. Two different types of baseline methods: autoslope and extended, were discussed and the results show that the baseline values will change with the baseline methods. Experiments of three samples also testify that the larger the baseline values are, the smaller the effective diameter and the polydispersity are. The reason that the results measured by autoslope ate more stable than those measured by extended was analyzed.