Design of Differential-Switched-Capacitor vortez flowmeter
The structure of DSC has a high vibration resistance and a high temperature resistance(up to 400 ) and so, a DSC sensor is adopted in the design of a vortex flowmeter, which is mainly comprised of a movable electrode and two fixed electrodes. The movable electrode of DSC is a hollow cylinder and the fixed electrodes are two metal films symmetrically plated on a dielectric cylinder. The air between the movable electrode and the fixed electrodes is the medium of DSC. A Simplified Model is established to research the operation principle of Differential-Switched-Capacitor. Based on the characteristics of vortices, a Differential Switched-Capacitor Converter is adopted, which utilize a electronic analog switch to complete the charge and discharge of the two capacitors alternatively under the control of a clock signal to convert the capacitance signal of DSC into a voltage signal. Experiments are performed on water medium in a pipe of 25mm in nominal diameter. Five calibration points are selected and three tests are performed of each calibration points. Experimental results show that the accuracy of DSC vortex flowmeter is 0.62％ and the repeatability error is 0.16％.
Vortez flowmeter Differential-Switched-Capacitor Preamplifier Circuit
Zhang Yu Dai Jingmin
Institute of Automatic Detecting and Process Control System, Harbin Institute of Technology,Harbin, Institute of Automatic Detecting and Process Control System, Harbin Institute of Technology, Harbin,
国际会议
第五届仪器科学与技术国际学术会议(ISIST 2008)Fifth International Symposium on Instrmentation Science and Technology
沈阳
英文
1-6
2008-09-15（万方平台首次上网日期，不代表论文的发表时间）