Transmission Design of the Ultrasonic Flow Measurement Based on the Correlation Method

摘要：

　　In design of ultrasonic flow measurement,the reproducibility of constant amplitude periodic signal will lead to a not unique time difference based on the correlation method.The aim of this paper is to design a set of amplitude modulation transmitting signal to solve the multiple values calculation of the time difference.The frequency characteristics of ultrasonic probe and the amplitude frequency characteristic of different duty cycle square wave are researched and tested.We cleverly combine the logic device FPGA with the property of the ultrasonic probe to achieve the amplitude modulation waveform in the circuit design.The experimental results show that FET switch controlled by the logic device FPGA can transmit anplitude modulation signal.The measured error of time difference after correlation is not more than 1.62μs.

关键词： Ultrasonic flow measurement Correlation Algorithm Drive Pulse Duty Ratio Amplitude modulation Transmitting circuit Probe analysis Frequency characteristic

作者: Hui XU Zengtian Yan Yang Wang Songwei Gao

作者单位: School of Information Science and Engineering,Shenyang University of Technology,Shenyang,110870,China

会议类型: 国际会议

会议名称: the 2012 2nd International Conference on Frontiers of Manufacturing Science and Measuring Technology (第二届制造科学与检测技术国际会议(ICFMM 2012))

会议地点: 西安

会议语种:英文

页码: 1441-1444

在线出版日期: 2012-06-12（万方平台首次上网日期，不代表论文的发表时间）