Measuring and testing – Volume or rate of flow – Using differential pressure
Patent
1996-08-14
1998-03-31
Dombroske, George M.
Measuring and testing
Volume or rate of flow
Using differential pressure
G01F 184
Patent
active
057341125
ABSTRACT:
A method for determining pressure in an operating Coriolis effect mass flowmeter. The Coriolis flowmeter flow tubes are vibrated in both a bending mode (as is normal for measuring mass flow rate) and in a twisting mode. The ratio of the fundamental frequencies at which the flow tubes vibrate in each of the two vibration modes is proportional to the pressure within the flow tubes. In the preferred embodiment, a sum/difference method initially isolates the superposed sinusoids representing the fundamental frequencies of the two vibrational modes. Fast conjugate gradient (FCG) digital filters are then used to rapidly estimate the fundamental frequencies in each of the two vibration modes. The estimated frequencies are then used by filter chains including digital notch and band pass filters as well as recursive maximum likelihood (RML) digital filter techniques to enhance the bending mode and twisting mode fundamental frequency estimates. The enhanced bending mode and twisting mode frequency estimates are used to determine the pressure within the flow tubes as a function of the ratio of the two frequencies as well as to center the notch and band pass filter chains used to enhance the bending mode frequency of the two vibration sensor channels for mass flow rate computations. The pressure so determined may then be used to correct mass flow rate computations or for other pressure measurement purposes per se.
REFERENCES:
patent: 4823613 (1989-04-01), Cage et al.
patent: 4934196 (1990-06-01), Romano
patent: 5054326 (1991-10-01), Mattar
patent: 5301557 (1994-04-01), Cage et al.
patent: 5347874 (1994-09-01), Kalotay et al.
patent: 5373745 (1994-12-01), Cage
patent: 5423225 (1995-06-01), Cage
patent: 5448921 (1995-09-01), Cage et al.
patent: 5473949 (1995-12-01), Cage et al.
patent: 5555190 (1996-09-01), Derby et al.
patent: 5576500 (1996-11-01), Cage et al.
Bose Tamal
Derby Howard Vincent
Levien Andrew Keith
Pankratz Anthony William
Amrozowicz Paul D.
Dombroske George M.
Micro Motion Inc.
LandOfFree
Method and apparatus for measuring pressure in a coriolis mass f does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Method and apparatus for measuring pressure in a coriolis mass f, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Method and apparatus for measuring pressure in a coriolis mass f will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-53846