基于互相关理论的时差法超声波流量检测系统  

Time-difference Ultrasonic Flow Detection System Based on Cross-correlation Theory

作　　者：吴晓庆[1] 李艾华[1] 李芳[1] 

机构地区：[1]第二炮兵工程学院

出　　处：《上海计量测试》2006年第2期22-24,共3页Shanghai Measurement and Testing

摘　　要：介绍一种时差法超声波流量检测系统。系统以两超声探头同侧V型安装方式,采集顺、逆流回波信号经插值后作互相处理,由互相关函数的峰值得出两回波信号的时差,间接测出流量。插值算法的引入,提高了回波信号的时间分辨率,实现了微小时差的测量。该系统测量精度高、统计特性好,在液压系统的测量中取得了较理想的效果。A time-difference ultrasonic flow detection system is introduced, whose two transducers are operated on unilateral V-mode. After the upstream and down-stream echo signal been sampled, interpolated and cross- correlated, time-difference of the echo signal is gained in accordance with the peak of the echo signal＇s cross-correlation function. Through the time-difference, the flux of the detected pipe can be mensurated indirectly. The introducing of interpolation improves the time-resolution of the echo signal and the measure of minute time-difference is realized. The system with high precision in detection and good statistic characteristic behaves well in the flux detection of hydraulic system.

关 键 词：超声波 流量检测 互相关 时差 

分 类 号：TH814.92[机械工程—仪器科学与技术]