二维侧视型声学多普勒流速仪的设计  

Design of two-dimensional side-looking acoustic Doppler velocimeter

作　　者：廖建华 范寒柏[1] 王健[1] 林放 苏金峰 Liao Jianhua;Fan Hanbai;Wang Jian;Lin Fang;Su Jinfeng(College of Electrical and Electronic Engineering,North China Electric Power University,Baoding 071000,China)

机构地区：[1]华北电力大学电气与电子工程学院,河北保定071000

出　　处：《电子技术应用》2023年第8期65-69,共5页Application of Electronic Technique

摘　　要：为了获得浅水或断面处的二维流速分布,扩展超声波测量的应用范围,设计了二维侧视型声学多普勒流速仪。采用5 MHz高频超声波进行测量,并设计了独特的探头结构,避免对测流场产生干扰。基于多普勒效应的基本原理,采用复自相关算法进行频率估计,解算出超声波换能器的径向流速,通过变换矩阵得到二维流速。实测结果表明,所设计的二维侧视型声学多普勒流速仪能有效测量出采样体的二维流速,测量标准差分别为0.028 m/s和0.009 m/s,具有一定的实用价值。To obtain the two-dimensional velocity distribution at the shallow or cross-section of the water and expand the application range of ultrasonic measurement,a two-dimensional side-looking acoustic Doppler velocimeter was designed.A 5 MHz highfrequency ultrasonic wave was used for measurement,and a unique probe structure was designed to avoid interference to the measuring flow field.Based on the basic principle of the Doppler effect,the complex autocorrelation algorithm was used to estimate the frequency,and the radial velocity of ultrasonic transducer was calculated.The two-dimensional velocity was obtained through the transformation matrix.The experimental results show that the designed two-dimensional side-looking acoustic Doppler velocimeter can effectively measure the two-dimensional velocity of the sample with the standard deviation of 0.047 m/s and 0.009 m/s respectively,which has certain practical value.

关 键 词：多普勒流速仪 二维流速 复自相关 

分 类 号：TP212[自动化与计算机技术—检测技术与自动化装置] TB553[自动化与计算机技术—控制科学与工程]