作者：顾建飞1, 葛师语1, 陈晓兰1, 贾楠2, 顾亚1
作者单位：1. 常熟理工学院电气与自动化工程学院，江苏 常熟 215500;
2. 上海理工大学能源与动力工程学院，上海 200093
关键词：超声;衰减谱;颗粒;反演;粒径表征
摘要：
超声法颗粒粒径表征中，超声衰减谱的特征如谱宽、频率数，非常重要。为获取理想声衰减谱，提出一种猝发叠加波，该方法可实现对成分波的频率和能量可控。为对比叠加波与传统脉冲波、单频波在粒径表征方面的区别，设计对应激励方式的测试系统。通过采用一对中心频率15 MHz的宽带压电换能器，对3种不同粒径分布的聚苯乙烯试剂进行测试，并利用正则化优化算法，反演出样品颗粒粒径分布。结果表明：超声衰减谱的范围和超声频率数对粒径反演有明显影响；对颗粒粒径较大的情形，传统激励方式未获得理想的衰减谱，而猝发叠加波可有效增加频率数并拓宽衰减谱范围。通过不同激励方式测量结果与显微镜分析对比，猝发叠加波测量的粒径分布结果与实际分布更接近。
Research of particle size characterization method based on burst superposed ultrasound
GU Jianfei1, GE Shiyu1, CHEN Xiaolan1, JIA Nan2, GU Ya1
1. School of Electrical and Automatic Engineering, Changshu Institute of Technology, Changshu 215500, China;
2. School of Energy and Power Engineering, University of Shanghai for Science and Technology, Shanghai 200093, China
Abstract: In the characterization of particle size by ultrasonic method, the spectrum characteristics such as bandwidth and frequency number are very important. To obtain the desired ultrasonic attenuation spectra, burst superposed wave had been proposed. It was combined by a series of component waves whose frequency and relative energy can be controlled. The corresponding experimental systems were designed, to contrast the burst superposed wave, traditional pulse wave and single-frequency wave in particle size characterization. Experiments were carried out to measure the particle size distribution of three kinds of aqueous polystyrene suspension samples by using a pair of broadband ultrasonic transducers with a center frequency of 15 MHz. The regularization optimization algorithm was used to inverse the particle size distribution of suspension samples. The results show that the range of spectrum and the number of ultrasonic frequencies have obvious influence on the particle size inversion. In the extreme case of large particles, two traditional excitations cannot obtain ideal spectra, but burst superposed wave can effectively broaden the scope of attenuation spectra and add frequencies. It indicated that the results of the particle size distribution measured by burst superposed ultrasound are closer to the actual distribution from the contrast of microscope image analysis.
Keywords: ultrasonic;attenuation spectrum;particle;inversion;particle size characterization
2021, 47(5):33-38 收稿日期: 2020-06-28;收到修改稿日期: 2020-09-01
基金项目: 江苏省高校自然科学研究面上项目(19KJB470009)
作者简介: 顾建飞(1990-),男,江苏南通市人,讲师,博士,主要从事颗粒两相流检测技术与方法
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