基于超声流量计的包络互相关时延理论及仿真  

Envelope Correlation Delay Theory and Simulation for Ultrasonic Flow Meter

作　　者：贾佳[1] 谷立臣[1] 

机构地区：[1]西安建筑科技大学机械电子研究所,陕西西安710055

出　　处：《自动化仪表》2012年第7期53-55,共3页Process Automation Instrumentation

基　　金：国家自然科学基金资助项目(编号:50975218)

摘　　要：针对超声波流量计存在的互相关函数法峰值确定难、运算量大等问题,采用了一种基于傅里叶变换(FFT)的直接提取相关函数包络的快速算法。对超声波流量计建立了物理测量模型,并得出数学模型,然后利用基于FFT方法直接提取相关函数包络。Matlab仿真结果证明,该方法能精确提取相关函数的包络,并搜索到相关函数的峰值位置,从而大幅度提高超声波流量计的精度。Aiming at the problems of the difficulty of determining the peak value of cross correlation function for ultrasonic flow meter and the complexity of calculation, the fast speed algorithm based on FFT for directly extracting envelope of correlation function is used. The physical measurement model is established for ultrasonic flow meter, and the mathematical model is derived, then by adopting the method based on FFT, the envelop of correlation function is extracted directly. The result of Matlab simulation verifies that this method does accurately extract the envelop of correlation function and search the peak value of correlation function, thus greatly improve the accuracy of ultrasonic flow meter.

关 键 词：超声波流量计 傅里叶变换(FFT) 测量精度 Matlab 峰值 

分 类 号：TH814[机械工程—仪器科学与技术]