基于加权累积量的纳米颗粒反演算法

Dynamic light scattering for nano-particle measurement with weighted cumulant

结合传统累积量法和Frisken累积量法,提出了一种加权累积量纳米颗粒反演算法,以减小反演过程中相关时间对测量的影响。采用动态光散射纳米颗粒测量实验平台对90 nm和190 nm的乳胶颗粒进行了测量,通过传统累积量法、Frisken累积量法和文中提出的加权累积量法对颗粒粒径进行反演。实验结果表明:传统累积量法在相关时间变长、相关函数到达零位附近后,颗粒粒径误差和标准方差变大趋势明显;Frisken累积量法在相关时间较小的情况下,其反演的颗粒粒径误差和标准方差较大;而加权累积量法继承了传统累积量运算量小的特点,同时也克服了以上2种算法的缺点,在全局均有较好的反演结果。

Weighted cumulant which combined traditional cumulant with Frisken′s cumulant was proposed to reverse nano-particle diameter with dynamic light scattering.The effect of correlation time was reduced when particle diameter was reversed.The 90 nm and 190 nm particles were measured with dynamic light scattering equipment.Traditional cumulant,Frisken′s cumulant and weighted cumulant were used to reverse nano-particle diameter.The experimental result shows that the particle diameter error and standard deviation which is reversed with traditional cumulant is increased when the correlation time increases and the correlation faction is around zero;the particle diameter error and standard deviation which is reversed with Frisken′s cumulant is big when the correlation time is not big enough and correlation data is less;the weighted cumulant inheritance the advantages of traditional cumulant and Frisken′s cumulant,and the disadvantages of traditional cumulant and Frisken′s cumulant are overcame.So the reverse result is stability overall situations and have the advantage of lower calculate time.