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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%.
Yu Zhang andJingmin Dai
"Design of differential-switched-capacitor vortex flowmeter", Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 71332J (12 January 2009); https://doi.org/10.1117/12.821237
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Yu Zhang, Jingmin Dai, "Design of differential-switched-capacitor vortex flowmeter," Proc. SPIE 7133, Fifth International Symposium on Instrumentation Science and Technology, 71332J (12 January 2009); https://doi.org/10.1117/12.821237