基于超声衰减谱的脂肪乳粒度分布测量方法  

Measurement of Particle Size Distribution in Fat Emulsion Using Ultrasonic Attenuation Spectrum

作　　者：董黎丽[1] 苏明旭[1] 薛明华[1] 尚志涛[1] 蔡小舒[1] 

机构地区：[1]上海理工大学颗粒与两相流测量技术研究所,上海200093

出　　处：《过程工程学报》2008年第1期8-12,共5页The Chinese Journal of Process Engineering

基　　金：国家高技术研究发展计划(863)基金资助项目(编号:2006AA03Z349)

摘　　要：研究了超声衰减法测量高浓度多分散脂肪乳浊液的粒径分布问题.在理论分析的基础上,实验测量了多个浓度(1%～20%)下脂肪乳试样在2～13MHz频带下的超声衰减谱,结合反演算法,由实验数据计算出乳浊液颗粒的粒径及其分布.将用超声衰减法对脂肪乳试样在原始浓度(20%)下测得的粒径分布与用消光法超细颗粒粒径分析仪在稀释条件下对试样的测量结果作对比,粒径均小于1μm时,二者比较吻合.超声法测得的浓度与给定值误差约3%,反演谱误差率小于10%,表明此法可在无需稀释的高浓度条件下准确测得乳浊液的粒径分布和浓度.Characteristics of droplet particle size distribution （PSD） in concentrated fat emulsions were investigated using ultrasonic attenuation measurement. Based on theoretical analysis and numerical results, the experiments in ultrasonic spectrum with a bandwidth range of 2-13 MHz measurement were carried out for oil volume fraction from 1% to 20%. Combined with the inverse algorithm, fat droplet sizes and distributions were determined from experimental data. Comparison with the results of light extinction method indicated that ultrasonic spectra method could produce fairly consistent PSD results, in which particle sizes were below 1μm. The error of experimental volume fraction and initial fraction （20%） is 3% and the deviation error between retrieval spectrttm and experimental spectrum is smaller than 10%, Moreover, it is suitable for high concentration emulsion and non-destructive tests.

关 键 词：超声波 衰减 测量 脂肪乳 粒径分布 

分 类 号：TB559[理学—物理]