Drive techniques for a digital flowmeter
AssigneeInvensys Systems, Inc.
InventorsManus P. Henry, Mayela E. Zamora
Life of this patent
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Abstract
Drive techniques for a digital flowmeter are described. The drive techniques account for delays caused during digital signal processing of sensor signals that correspond to a motion of a flowtube, as well as drive signals that impart motion to the flowtube. Such delays may be caused by a variety of factors, including delays associated with analog/digital conversion of the signals and/or filtering of the signals. The techniques include open-loop techniques and closed-loop techniques, which can be used separately or together during the start-up and operation of the digital flowmeter.
Claims19
A method comprising:
- inputting a first signal at a flowmeter, the first signal corresponding to a vibration of a flowtube;
- compensating for a delay of the first signal, the delay being associated with a digital element associated with the flowmeter;
- and
- outputting a second signal from the flowmeter, the second signal corresponding to the vibration of the flowtube.
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.
Dependencies are inferred from the claim text.