Patent ID: 8467986
Filing Date: 2013-06-18
Classification: G01F

Abstract:
1. A digital flowmeter, comprising: a vibratable flowtube; a sensor connected to the flowtube and operable to relay information about a motion of the flowtube by way of a sensor signal; a driver connected to the flowtube and operable to impart motion to the flowtube by way of a drive signal; and a digital control and measurement system connected to the driver and the sensor, the digital control and measurement system comprising circuitry to maintain the sensor signal and the drive signal substantially in phase with one another, wherein the digital control and measurement system is operable to compare the sensor signal and the drive signal, to thereby determine a phase difference therebetween, and is further operable to cause the driver to apply the drive signal with a phase altered by an amount determined by the phase difference, and wherein the digital control and measurement system further comprises a multiplexer that is operable to input the sensor signal and the drive signal and output a combined signal, and wherein the combined signal is analyzed by the digital control and measurement system to determine the phase difference.