Design of ultrasonic Doppler flowmeter based on spectrum refinement algorithm
As a kind of measurement sensor equipment,flowmeter is an important part of water information integrated system,and its data precision directly affects the measurement results of the system.In this paper,a high-precision ultrasonic Doppler flowmeter is designed based on the method of spectrum refinement.The flowmeter uses lowpower consumption MCU as the main control chip to generate a medium and high-frequency pulse signal with configurable frequency,which is driven by the power amplifier circuit and the ultrasonic transmitting circuit composed of high-power MOSFET.The echo signal extraction circuit is designed to realize the echo signal amplification,noise filtering,frequency difference signal extraction and other functions.The frequency resolution and precision of frequency shift calculation accuracy are significantly improved by using multiple modulation Zoom FFT spectrum refinement algorithm for spectral analysis.The experimental results show that the measurement errors of the flowmeter are 5.161%,2.248%and 1.985%at low flow rate(0.19 m/s),medium flow rate(0.5m/s)and high flow rate(0.984m/s),respectively.
flow velocity measurementDoppler flowmeterZooM FFT spectrum refinementsmart watermanagement system
万方数据
维普
