1.School of Electrical and Automation Engineering, Hefei University of Technology, Hefei, Anhui 230009, China
2.Engineering Technology Research Center of Industrial Automation, Hefei, Anhui 230009, China
Abstract：Combining digital spectral analysis with analog band-pass filter group and adopting the micro-control unit MSP430F1611, a novel digital vortex flowmeter with the two-wire output is developed, which can the measuring range, ensure the measurement accuracy in fields, and operate in low-power. It solves the key technique problem in this kind of flowmeters. A programmable amplifier is constructed by an amplifier with low-power and digital potentiometers in order to adapt large change of amplitude of vortex sensor output. A band-pass filter group is selected by the computation result of small number FFT to cover the variation range of vortex frequency and perform optimal filter for the vortex signal. A power management module and current output circuit are designed to provide enough electrical current for meter operation with two-wire.
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2011, Vol. 32 
