基于超声谱分析的颗粒粒度测量研究

为验证不同超声谱测量和分析方式对颗粒粒度测试的影响,设计了一种非侵入式超声波透射和多次反射信号同步测量实验装置。采用脉冲回波法、反射比样法和透射法分别对体积分数为1%～4%的聚苯乙烯-水悬浮液进行实验,结合理论模型,分析超声波在颗粒两相体系中的衰减谱、相速度谱和阻抗谱。以ECAH模型为理论基础,结合ORT反演算法,对不同超声谱进行反演获得了聚苯乙烯样品颗粒粒径分布。将上述结果与图像法对比,颗粒中位径结果偏差均在15%之内,3种谱分析的粒径分布也较为吻合。

Characterization of Particle Size Distribution Based on Ultrasonic Spectra Analysis

To verify the effect of different ultrasonic spectra and analysis methods on particle size distribution, the experimental setup was established to provide a non-invasive way in synchronously acquiring ultrasonic reflection and transmission signals. Then the experiments were carried out on four polystyrene-water solutions at volume fractions from 1% to 4% to extract the ultrasonic spectra based on pulse-echo method, reference reflection method and through-transmission method, respectively. Based on the ECAH model, the ORT algorithm was used to solve the particle size distribution by means of various experimental spectra, which were also compared with the optical microscope method. It showed that the different spectra analysis yielded a relatively consistent result and the volume median diameters within a deviation of 15%, which further verified the reliability in measuring the particle size distribution of the suspension.