A Vibration Starting Method of Coriolis Mass Flowmeter Based on All-digital Drive Mode
A technology of mass flowmeter and driving method, which is applied in the direction of direct mass flowmeter, mass flow measurement device, measurement flow/mass flow, etc., which can solve the problems of poor flow tube state tracking performance and long start-up time, etc., to improve tracking performance and reliability, shortening the time of change, and improving the effect of vibration start-up time
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[0016] The present invention will be further described below in conjunction with the accompanying drawings and embodiments.
[0017] Step 1. Initialize the frequency range, signal amplitude, and output duration of each frequency of the output square wave signal: the frequency range of the output square wave signal covers the resonance frequency of all types of Coriolis flow tubes, and the amplitude of the square wave signal passes through a The first-stage gain conditioning circuit composed of OPA4277 (Operational Amplifier, OPA) high-precision operational amplifier amplifies the amplitude by 15 times, and the amplitude of the square wave signal after 15 times of amplitude amplification remains unchanged, and the frequency range of the initialized square wave signal is adjusted. Sweep frequency output, the sweep frequency resolution is set to 1Hz according to the CMF flow tube start-up vibration sweep frequency bandwidth, each square wave frequency continues to output for 20ms,...
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