Abstract
In order to eliminate vibration harmonic interference and solve the measurement problem of the co-frequency signal that the flow signal and vibration interference are at the same or similar frequency, a signal processing method combining frequency variance with amplitude feature is proposed for the vortex flowmeter with a single piezoelectric sensor. The method uses multiple peak frequencies to calculate the frequency variance, and then rapidly outputs the frequency of the flow signal. The ratio of the spectral amplitude to the dynamic cut-off amplitude is used as an auxiliary criterion to eliminate vibration harmonic interference. The maximum difference among spectral amplitudes of the co-frequency signal is used to solve the measurement problem of the co-frequency signal. A low-power and two-wire vortex flowmeter system was developed, and the gas calibration experiment and anti-vibration experiment were performed to validate the effectiveness and measurement accuracy of the anti-vibration method.
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