Analysis of phase difference tracking methods for signal of coriolis mass flowmeter

In order to achieve a high precision flow measurement and to improve its dynamic response speed of the mass flowrate, it is important to calculate the phase difference of the two sensor output signals accurately and to track its variation in time. The phase difference tracking methods in studying Coriolis mass flowmeter at home and abroad are described comprehensively, and seven main methods were summarized firstly, including the method based on digital phase-locked loop, the method based on quadrature demodulation, the method based on discrete Fourier transform, the method based on adaptive notch filtering, the method based on Hilbert transform and etc. Then the basic idea, the advantages and disadvantages of the main methods were analysed and compared. Finally, analysis and prospect in this field were discussed.