A Novel Phase Difference Measurement Method for Coriolis Mass Flowmeter Based on Correlation Theory

Aiming at the poor precision problem in phase difference measurements with unknown frequencies engineering practice, a new measurement method is proposed for Coriolis mass flowmeter based on correlation theories. Firstly, signal frequency was estimated by using an adaptive notch filter, which applied to filter waves and determined integer period of sampling signals, non-integer signals needed be extended. Then, Hilbert transformation conducted relative extended functions these transformed can computed. Finally, formula obtained utilizing sinusoidal function. Compared traditional methods, such as method, sliding Goertzel algorithm, suitable both its accuracy, real-time, dynamic performance superior. Simulation experiment results validate superiority effectiveness method.