脉冲回波对比法非介入测量液体声阻抗的灵敏度

南京大学学报(自然科学版) ›› 2017, Vol. 53 ›› Issue (1): 122–.

脉冲回波对比法非介入测量液体声阻抗的灵敏度

祁宏昌1，梁双龙2，莫润阳2*

出版日期:2017-01-19 发布日期:2017-01-19
作者简介:1.广州供电局有限公司输电管理所，广州，510310；2.陕西省超声学重点实验室，陕西师范大学，西安，710119
基金资助:
基金项目：国家自然科学基金(11274216)，陕西省工业攻关项目(2016GY－057)，中央高校专项(GK201603102) 收稿日期：2016－09－15 *通讯联系人，Email：mmrryycn@snnu.edu.cn

Sensitivity of noninvasive measurement of acoustic impedance by compared pulse echo technique

Qi Hongchang1，Liang Shuanglong2，Mo Runyang2*

Online:2017-01-19 Published:2017-01-19
About author:1.Guangzhou Power Supply Bureau Co.，Ltd.，Guangzhou，510310，China； 2．Shaanxi Key Laboratory of Ultrasonic，Shaanxi Normal University，Xi’an，710119，China

摘要/Abstract

摘要： 基于声波在异质界面声压反射系数对界面两侧介质特性声阻抗变化的敏感性，将回波高度随待测液体阻抗变化的函数作为系统的灵敏度，通过构建新的数学方法并通过设计实验快速实现对二甲基硅油的特性声阻抗的非介入测试．实验时以钢板做反射基板，用钢/水界面对检测系统进行标定，分别测试超声波在钢板与水、钢板与待测液体界面的多次反射回波幅度，并通过回波幅度比对方法获得待测液体介质的特性声阻抗值．结果显示，在容器壁与其内液体介质构成的固/液界面上的第一次界面反射回波较其它高次回波具有最高的灵敏度；新方法提供了液体特性声阻抗的直接信息；器壁材料一定时，其厚度对检测结果有一定影响．

Abstract: The reflection coefficient of acoustic pressure at the interface is related to the acoustic impedance of the two media.The system sensitivity is defined as a function of echoes height changes with liquid impedance.A novel mathematical approach and a pulseecho comparison technique have been used to evaluate the sensitivity of the method and measure the acoustic impedance of insulating silicone oil in one instant.Two kinds of interface such as steel/water and steel/silicone oil were used in this project.The boundary of base plate steel and water was used to calibrate the test system and echo height from other interface was compared with it.The relative amplitude of pulse echoes is sensitive to acoustic impedance of the both sides medium.Results show that the first echo at the interface has the highest sensitivity to the acoustic impedance of liquid.The sensitivity of the second and other high order time echoes decrease systematically.The new method provides direct information on the acoustic impedance of the liquid and the thickness of steel reflector affect the sensitivity.

祁宏昌1，梁双龙2，莫润阳2*. 脉冲回波对比法非介入测量液体声阻抗的灵敏度[J]. 南京大学学报(自然科学版), 2017, 53(1): 122–.

Qi Hongchang1，Liang Shuanglong2，Mo Runyang2*. Sensitivity of noninvasive measurement of acoustic impedance by compared pulse echo technique[J]. Journal of Nanjing University(Natural Sciences), 2017, 53(1): 122–.

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