Patent ID: 9014994
Filing Date: 2015-04-21
Classification: G01F,G01N

Abstract:
1. A flowmeter comprising: a vibratable flowtube for containing a multi-phase fluid; a driver connected to the flowtube and configured to impart motion to the flowtube such that the flowtube vibrates; a sensor connected to the flowtube and configured to sense the motion of the flowtube and generate a sensor signal indicative of said motion; and a controller to receive the sensor signal and configured to: determine an estimated frequency of the sensor signal; compare the estimated frequency with an expected frequency range; eliminate a zero offset from the sensor signal when the determined frequency is within the expected frequency range; determine an amplitude of the sensor signal; determine a phase of the sensor signal; and output a drive signal to the driver, the drive signal being determined by the controller using the amplitude and the phase of the sensor signal.