Measuring and testing – Volume or rate of flow – Using differential pressure
Reexamination Certificate
2007-08-28
2007-08-28
Patel, Harshad (Department: 2855)
Measuring and testing
Volume or rate of flow
Using differential pressure
Reexamination Certificate
active
11124753
ABSTRACT:
Flow rate measurement system includes two measurement regions14,16located an average axial distance ΔX apart along the pipe12, the first measurement region14having two unsteady pressure sensors18,20, located a distance X1apart, and the second measurement region16, having two other unsteady pressure sensors22,24, located a distance X2apart, each capable of measuring the unsteady pressure in the pipe12. Signals from each pair of pressure sensors18,20and22,24are differenced by summers44,54, respectively, to form spatial wavelength filters33,35, respectively. Each spatial filter33,35filters out acoustic pressure disturbances Pacousticand other long wavelength pressure disturbances in the pipe12and passes short-wavelength low-frequency vortical pressure disturbances Pvorticalassociated with the vortical flow field15. The spatial filters33,35provide signals Pas1,Pas2to band pass filters46,56that filter out high frequency signals. The Pvortical-dominated filtered signals Pasf1,Pasf2from the two regions14,16are cross-correlated by Cross-Correlation Logic50to determine a time delay τ between the two sensing locations14,16which is divided into the distance ΔX to obtain a convection velocity Uc(t) that is related to an average flow rate of the fluid (i.e., one or more liquids and/or gases) flowing in the pipe12. The invention may also be configured to detect the velocity of any desired inhomogeneous pressure field in the flow. The invention may also be combined with an instrument, an opto-electronic converter and a controller in an industrial process control system.
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Bryant Rebecca M.
Gysling Daniel L.
Winston Charles R.
CiDRA Corporation
Crawford Robert D.
Patel Harshad
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