应用数字信号处理的涡街流量计数字信号处理系统

Applied digital signal processing systems for vortex flowmeter with digital signal processing.

作者信息

Xu Ke-Jun, Zhu Zhi-Hai, Zhou Yang, Wang Xiao-Fen, Liu San-Shan, Huang Yun-Zhi, Chen Zhi-Yuan

机构信息

Institute of Automation, Hefei University of Technology, Hefei 230009, People's Republic of China.

出版信息

Rev Sci Instrum. 2009 Feb;80(2):025104. doi: 10.1063/1.3082044.

DOI:10.1063/1.3082044

PMID:19256675

Abstract

The spectral analysis is combined with digital filter to process the vortex sensor signal for reducing the effect of disturbance at low frequency from pipe vibrations and increasing the turndown ratio. Using digital signal processing chip, two kinds of digital signal processing systems are developed to implement these algorithms. One is an integrative system, and the other is a separated system. A limiting amplifier is designed in the input analog condition circuit to adapt large amplitude variation of sensor signal. Some technique measures are taken to improve the accuracy of the output pulse, speed up the response time of the meter, and reduce the fluctuation of the output signal. The experimental results demonstrate the validity of the digital signal processing systems.

摘要

将频谱分析与数字滤波器相结合来处理涡街传感器信号，以减少管道振动产生的低频干扰影响，并提高量程比。利用数字信号处理芯片，开发了两种数字信号处理系统来实现这些算法。一种是一体化系统，另一种是分离式系统。在输入模拟调理电路中设计了限幅放大器，以适应传感器信号的大幅度变化。采取了一些技术措施来提高输出脉冲的精度，加快仪表的响应时间，并减少输出信号的波动。实验结果证明了数字信号处理系统的有效性。