多角度动态光散射技术中的基线误差补偿  

Baseline Error Compensation of Multi-Angle Dynamic Light Scattering Technique

作　　者：高珊珊[1] 申晋[1] 王雅静[1] 朱新军[1] 

机构地区：[1]山东理工大学电气与电子工程学院,山东淄博255049

出　　处：《光学学报》2013年第F06期93-98,共6页Acta Optica Sinica

基　　金：山东省自然科学基金（ZR2010FM005,ZR2012EEM028）资助课题.

摘　　要：多角度动态光散射（MDLS）颗粒测量技术因测量角度的增加，引入了较单个测量角度更多的基线测量噪声，从而导致反演得到的颗粒粒度分布（PSD）在大颗粒粒度处出现虚假峰值。针对此问题，提出MDLS中的基线误差补偿技术。首先根据各测量角度PSD虚假峰值对应的颗粒粒度光强百分比的变化，确定各角度最合适的基线误差补偿值，利用补偿值对各测量角度基线误差补偿并修正光强自相关函数，然后通过恰当的权重系数，将各个角度补偿后的光强自相关函数结合到一个数据分布中，最后利用正则化算法进行反演。对300nm与600nm的双峰模拟分布的颗粒体系和306nm与974nm的双峰实测分布的聚苯乙烯颗粒体系分别在六个和五个角度进行测量，反演结果表明，采用基线误差补偿技术后能够更好地从含噪声的光强自相关函数数据中反演得到双峰分布。In multi-angle dynamic light scattering（MDLS） technology, due to the increasing of scattering angles, the inevitable introduction of baseline measurement noise is larger compared to that in the single-angle dynamic light scattering case, which will lead to the emergence of false peak. Aiming at this problem, the baseline error compensation technology of MDLS is put forward. The baseline error compensation value in each angle is determined according to the change of light intensity percentage corresponding to the false peak. Following this, the baseline error is compensated and the light intensity autocorrelation function data with noise in each angle is corrected. Finally, light intensity autocorrelation function in every angle is combined with proper weight coefficients and is inversed with regularization method. Bimodal simulation distribution of 300 nm and 600 nm and a diluted bimodal suspension of 306 nm and 974 nm polystyrene latex standard spheres are measured at six angles and five angles respectively. The inversion result shows that the baseline error compensation technology proves better affection on the inversion of MDLS from light intensity autocorrelation data including baseline noise.

关 键 词：测量 动态光散射 多角度 基线误差补偿 颗粒粒度反演 

分 类 号：O436[机械工程—光学工程]