摘要
气体超声波流量计研制中,准确定位每个声道正程和逆程收到的回波信号特征点,是精确测量得到该方向传播时间以及通过计算各声道时间差精确得到气体流量值的关键。提出了提取与分析气体超声流量计动态调试数据的方法,获取了回波信号各峰的归一化幅值数据;比较其归一化系数差值,得出最大差值所在的相邻峰为特征峰,两特征峰之间的上升过零点为到达时间阈值点,根据确定的阈值点得到精确的传播时间值。通过Python完成对原始数据的提取和分离并整理到Excel文件中,通过Excel将归一化幅值数据转换为散点图并加以分析,从而快速准确地获取阈值点,进而定位回波信号特征点。通过该方法设定阈值参数的DN50型双声道气体超声流量计,实验证明,所研究的DN50型双声道气体超声流量计能满足气体超声流量计检定规程中对1.0级仪表精度的要求。
In the development of gas ultrasonic flowmeter, accurately locating feature points of the echo signal received in the positive and reverse ranges of each channel is the key to accurately measuring the propagation time in this direction and accurately obtaining the gas flow value by calculating the time difference between each channel. In this paper, through the extraction and analysis method of dynamic debugging data of gas ultrasonic flowmeter, the normalized amplitude data of each peak of the echo signal is obtained. After comparing the difference of its normalization coefficient, it is found that the adjacent peak where the maximum difference is located is the characteristic peak, and the rising zero crossing point between the two characteristic peaks is the threshold point of the arrival time, and then the accurate propagation time value is obtained according to the determined threshold point. The original data is extracted and separated by Python and sorted into Excel files. The normalized amplitude data is converted into a scatter diagram by Excel and analyzed, so as to quickly and accurately obtain the threshold points, and then locate the characteristic points of the echo signal. Through this method, the DN50 dual channel gas ultrasonic flowmeter with threshold parameters is set. The experiment shows that the DN50 dual channel gas ultrasonic flowmeter can meet the requirements of instrument accuracy with 1.0 class in the verification regulation of gas ultrasonic flowmeter.
作者
李凤
刘建昌
冯伦宇
李跃忠
LI Feng;LIU Jianchang;FENG Lunyu;LI Yuezhong(School of Mechanical and Electronic Engineering,East China University of Technology,Nanchang 330013,China;Jiangxi New Energy Technology and Engineering Research Center,Nanchang 330013,China)
出处
《仪表技术》
2023年第1期42-45,共4页
Instrumentation Technology
基金
国家自然基金项目(61663001)
江西省科技厅重点研发一般项目(20212BBE53033)。
关键词
多声道
气体超声波流量计
回波信号特征点
动态数据
提取与分析
multichannel
gas ultrasonic flowmeter
echo signal feature point
dynamic data
extraction and analysis
作者简介
李凤(1998-),女,在读硕士研究生,研究方向为检测技术与自动化仪表;李跃忠(1969-),男,博士,教授,研究方向为超声波流量计量、智能仪器仪表。
