基于超声多重反射法测量高衰减流体媒质声阻抗及浓度  

Measurement of characteristic acoustic impedance and concentration of high attenuation fluid using multiple reflected ultrasound echoes

作　　者：孟瑞锋[1] 刘振锋[1] 钟建军[1] 张丽芬[1] 叶兴乾[1] 刘东红[1] 

机构地区：[1]浙江大学生物系统工程与食品科学学院,杭州310058

出　　处：《农业工程学报》2011年第12期156-160,共5页Transactions of the Chinese Society of Agricultural Engineering

基　　金：十一五国家科技支撑课题(2009BADB9B06)

摘　　要：利用超声波在固(钢)液界面处声阻抗差异导致的多重反射回波,该文建立了测量被测流体媒质声阻抗及浓度的测量系统。用该系统测量了甲醇、乙醇、蒸馏水和丙三醇4种媒质的声阻抗,与标准值相比,发现测量的误差随被测媒质阻抗增加而迅速减小;同时用系统测量了CaCl2溶液的声阻抗,结果表明溶液阻抗与浓度呈显著线性关系,最大拟合误差小于2.7g/L。检测中,由于无需声波穿透被测媒质,此法尤其适合于工业中测定管道、容器内高衰减媒质的阻抗及浓度。Using multiple reflected echoes caused by the difference impedance of the solid-liquid interface, an ultrasonic system for measuring characteristic acoustic impedance of liquids was developed. The characteristic acoustic impedance of four materials were measured, such as methanol, ethanol, water and glycerol. Results indicated that the larger the liquid’s characteristic acoustic impedance value, the more accurate the system. Also, the impedance of CaCl2 solution was measured. Results indicated that the impedance was in linear with the concentration of solution, and the measurement error was no more than 2.7 g/L. Because of no need of transparence of ultrasound in liquids, this measurement system could be used to measure the impedance and concentration of a high attenuation liquid out from containers or pipeline wall.

关 键 词：反射 声阻抗 超声测量 浓度检测 反射系数 

分 类 号：TS201.7[轻工技术与工程—食品科学]