Coriolis mode processing techniques
AssigneeInvensys Systems, Inc.
InventorManus P. Henry
Life of this patent
Estimating the term…
Abstract
Flowmeters are described in which a sensor signal received from a sensor that is attached to vibratable flowtube, so as to determine properties of a fluid within the flowtube, contains a drive signal component and a coriolis mode component. The flowmeters are operable to determine drive parameters of the drive signal component, as well as coriolis parameters of the coriolis mode component. By analyzing the sensor signal based on the drive signal parameters, and not on the coriolis signal parameters, the flowmeters are able to provide stable and accurate determinations of the properties of the fluid.
Claims19
(canceled)
A method comprising:
- receiving a sensor signal from a sensor that is operable to sense a vibration of a flowtube having a fluid flowing therethrough, the sensor signal having a major signal component at a first frequency associated with a drive signal applied to the flowtube and a minor signal component at a second frequency associated with a contaminant of the sensor signal, the first and second frequencies being different;
- determining major signal parameters of the major signal component based on an analysis of the sensor signal during a time period defined with respect to the minor signal component;
- and
- determining a flow parameter of the fluid based on the major signal parameters.
A flowmeter transmitter comprising:
- at least one processing device;
- and
- a storage device, the storage device storing instructions for causing the at least one processing device to:
- receive a sensor signal from a sensor that is operable to sense a vibration of a flowtube having a fluid flowing therethrough, the sensor signal having a major signal component at a first frequency associated with a drive signal applied to the flowtube and a minor signal component at a second frequency associated with a contaminant of the sensor signal, the first and second frequencies being different;
- determine major signal parameters of the major signal component based on an analysis of the sensor signal during a time period defined with respect to the second frequency associated with the minor signal component;
- and
- determine a flow parameter of the fluid, based on the major signal parameters.
Dependencies are inferred from the claim text.