Applied digital signal processing systems for vortex flowmeter with digital signal processing.
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.
Xu
Ke-Jun
KJ
Institute of Automation, Hefei University of Technology, Hefei 230009, People's Republic of China. xukejun@mail.hf.ah.cn
Zhu
Zhi-Hai
ZH
Zhou
Yang
Y
Wang
Xiao-Fen
XF
Liu
San-Shan
SS
Huang
Yun-Zhi
YZ
Chen
Zhi-Yuan
ZY