Fast Detecting the Quality of Milk by Image-based Dynamic Light Scattering

• 1、Institute of Particle and Two-phase Flow Measurement, University of Shanghai for Science and Technology / Shanghai Key Laboratory of Multiphase Flow and Heat Transfer in Power Engineering (University of Shanghai for Science and Technology), Shanghai 200093, China

Abstract：In this paper, a novel method is proposed to assess the quality of milk in real time using ultrafast image-based dynamic light scattering. The measurement setup mainly consists of a semiconductor laser and a high-speed CMOS camera. The metamorphosis of the milk can be determined in real time by detecting the mean radius of particles in the milk. Three samples of different kinds of milk were measured sequentially within a week. The results show that the fresh milk-Ubest was the most unstable one and the mean radius of particles increased continuously all the time in a week. The radius of particles in Milkana and Vega de Oro milk remained stable in the first five and four days but changed violently in last three and two days, respectively. Considering the expiration date marked on the package, the results prove that this method can assess the quality of milk in real time.

Keywords： Image method, Dynamic light scattering, Fast detection, milk