Design of capacitive vortex flowmeter

This paper analysis the structure and working mechanism of capacitive vortex flow sensor and studies the signal conversion way of capacitive vortex flowmeter sensor. The part of hardware circuit of secondary instrument of capacitive vortex flowmeter was designed. Signal conditioning circuit was designed including a preamplifier circuit, filter circuit and Schmitt shaping circuit. The keyboard interface circuit, LCD interface circuit and the power circuit were designed by the low power single chip microprocessor MSP430 as the core. The part of software of second instrument of capacitive vortex flowmeter was developed including the design of monitoring system program, the design of keyboard interrupt service program, the design of liquid crystal display program and the design of signal acquisition and processing program. It can obtain correct and reliable test data after experiment. It achieves expected goal and gets a good result.