摘要：为了研究消光法颗粒粒径测量过程中浓度对测量结果的影响,根据Lambert-Beer定律,对不同浓度下的乳剂采用多波长消光法进行测量分析,同时采用蒙特卡罗法进行数值模拟分析。实验和数值结果均表明:浓度对消光法测试结果的影响效果存在一个临界浓度范围。对于脂肪乳剂,该临界浓度出现在质量分数1.8‰左右;对于橄榄油乳剂,临界浓度则出现在0.5‰～0.6‰之间。超过该范围后,测量的粒径将受浓度变化剧烈影响。

关键词：消光法；粒径测量；浓度

Abstract： In order to investigate the influence of emulsion concentration on particle sizing， and based on Lambert-Beer law, a series of experiments on emulsion particle sizing at different concentrations were carried out by using multi-spectral light extinction method. Numerical simulations based on Monte Carlo method were performed to discuss the possible multiple scattering effects on particle sizing at higher concentration. Both results in dicated that a critical concentration was found，which appeared in around 1.8‰ for the fat emulsion and between 0.5‰ to 0.6‰ for the olive oil emulsim. Over the critical concentration， the accuracy of particle size measurement could be dramaticlly affected by variation of particle concentration. 

Keywords：light extinction method； particle sizing； concentration