Abstract: An adaptive normalized notch filter is applied to filter the sensor output signals of a Coriolis mass flowmeter and calculate its frequency.An adaptive line enhancer based on the above-mentioned notch filter extracts the required signals from the noisy data.The sliding Goertzel algorithm is used to calculate the real time phase difference between two signals of this kind.With the frequency and phase difference obtained, the time interval of the two signals and the mass flowrate are derived.The simulation results show that the algorithms studied in this paper are efficient.

Key words: Coriolis mass flowmeter, normalized lattice notch filter, sliding Goertzel algorithm