提出了一种检测乳制品品质的新方法。利用低相干光源和迈克耳孙干涉仪, 结合传统的激光动态光散射技术组成低相干动态光散射装置, 通过检测后向散射光场强度的自相关函数的变化来判断乳制品是否变质。以保存在冰箱和室温下的牛奶为样品, 检测了从样品中后向散射的单次散射光场强度的自相关函数, 并采用CONTIN算法对实验数据进行分析。结果表明, 保存在室温下的牛奶在前5天检测到的散射光场强度的自相关函数与保存在冰箱中的牛奶无明显变化, 但后2天发生了剧烈变化, 意味牛奶已变质, 而粒径分布变得更宽, 证实了该方法能对乳制品进行品质鉴定。

A new method measuring the quality of dairy products is proposed. The low-coherence dynamic light scattering setup consists of the combination of the low-coherence source and Michelson interferometer and the traditional dynamic light scattering technology. By detecting the variation of the field autocorrelation function of the single backscattered light, the deterioration of the milk can be discriminated on-line. The autocorrelation function of the single backscattered light field intensity from milk saved in refrigerator and room temperture was dectected, and the CONTIN algorithm was used to analyze the experimental data. The experimetnal results show that the autocorrelation function of the single backscattered light field intensity from milk saved in room temperture did not change in the anterior five days, but the autocorrelation function varied violently in posterior two days, indicating that the milk is deterioration and the particle size distribution is wider. It proves that the method can measure the quality of dairy products.