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《Journal of Data Acquisition and Processing》 2011-05
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Signal Processing in Transit Time Ultrasonic Flow Measurement Based on Correlation

Pu Cheng,Zhang Tao,Qi Lei(School of Electrical Engineering & Automation of Tianjin University,Tianjin Key Laboratory of Process Measurement and Control,Tianjin,300072,China)  
Signal processing issues on time-of-flight estimation by correlation in transit time ultrasonic flow measurement are discussed,including the position of the envelope extraction and the ambiguity problem when searching the correlation peak.The realistic flow experiments are conducted on the air flow experimental facility to compare the pre-correlation-envelope-extracting(PRCEE) method with the post-correlation-envelope-extracting(POCEE) one.The results show that the average reading error of the flow rate obtained by POCEE is about half of that obtained by PRCEE and the standard deviation is about 1/3,as it takes advantage of the fine structure of the carrier and makes full use of the signal information.Moreover,the probability distribution of the correlation peaks is given.And the time gating at peaks as well as the temporal/spatial median filtering is introduced to solve the ambiguity problem of correlation peak search.With the nonlinear processing techniques,the reading error of flow rate at 18.9 m/s reduces from 30% to 3.3% and the standard deviation from 2 m/s to 0.35 m/s.
【Fund】: 国家高技术研究发展计划(“八六三”计划)(2008AA042207)重点资助项目
【CateGory Index】: TP274;TN911.7
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