传感技术学报2017，Vol.30Issue(7)：985-990,6.DOI:10.3969/j.issn.1004-1699.2017.07.002
超声波液体密度测量的一种声反射系数测定方法
A Method for Measuring the Acoustic Reflection Coefficient of Liquid Density Measurement by Ultrasonic Wave
李晓佳 1刘佳鑫 2李国锋1
作者信息
- 1. 大连理工大学电气工程学院,辽宁 大连 116024
- 2. 国网辽宁省电力有限公司电力科学研究院,沈阳 110006
- 折叠
摘要
Abstract
Measurement of acoustic reflection coefficient is the key point when measuring the density of liquid by ultrasonic wave.This paper presents a method for measuring the acoustic reflection coefficient through the relative steady state amplitude based on the simplified model of half wave reflection.A thin solid as a half wave layer is arranged in the measured liquid,and two ultrasonic transducers are placed on both sides of the measured liquid,symmetrically.One transmitter works in pulse-echo mode,and the other works in receiver mode.By adjusting the frequency of signal to make the multiple reflection wave at the interface between the half wave layer and the liquid interfere to the greatest extent,the acoustic reflection coefficient between the liquid and the half wave layer is only related to the amplitude ratio of the two transducers in steady state.So the sound acoustic reflection coefficient can be obtained when the echo signal amplitude ratio of the transducer in steady state is measured.This method simplifies the process of theoretical derivation and reduces the accuracy of the measurement,by simplifying the original half wave reflection model,taking the symmetrical layout and using the method of relative steady state amplitude.At last,experiments are carried out to verify this method.关键词
超声传感器/声反射系数/半波层反射法/简化模型/相对稳态幅度法/液体密度测量Key words
ultrasonic sensor/acoustic reflection coefficient/half wave reflection method/relative steady state amplitude method/liquid density measurement分类
信息技术与安全科学引用本文复制引用
李晓佳,刘佳鑫,李国锋..超声波液体密度测量的一种声反射系数测定方法[J].传感技术学报,2017,30(7):985-990,6.
