Data processing: measuring – calibrating – or testing – Measurement system – Measured signal processing
Reexamination Certificate
2005-07-05
2005-07-05
Hoff, Marc S. (Department: 2857)
Data processing: measuring, calibrating, or testing
Measurement system
Measured signal processing
C324S306000
Reexamination Certificate
active
06915242
ABSTRACT:
A signal processor, for use with a zero crossing module of a vortex flow meter, includes a peak amplitude detector, a comparator, and a filter module. The filter module is enabled when the comparator determines that the amplitude is less than a low flow rate threshold. The filter module filters a vortex signal and the filtered signal is provided to a frequency estimator that uses a zero crossing algorithm. The signal processor may increase the signal-to-noise ratio at low flow rates for which the frequency estimator may not otherwise be able to accurately estimate the flow rate. Low flow rates may be measured by determining that there is a low flow rate using amplitude detection of a vortex signal, filtering the vortex signal based on the amplitude detection, and using a zero crossing algorithm on the filtered vortex signal.
REFERENCES:
patent: 3709034 (1973-01-01), Herzl
patent: 4069713 (1978-01-01), Gassmann
patent: 4123940 (1978-11-01), Herzl et al.
patent: 5121639 (1992-06-01), McShane
patent: 5570300 (1996-10-01), Henry et al.
patent: 5602346 (1997-02-01), Kitami et al.
patent: 6140952 (2000-10-01), Gaboury
patent: 6408700 (2002-06-01), Matt et al.
patent: 6598004 (2003-07-01), Ishida et al.
patent: 6606916 (2003-08-01), Bignell et al.
patent: 2002/0038186 (2002-03-01), Henry et al.
patent: 2002/0129661 (2002-09-01), Clarke et al.
patent: 1551220 (1979-08-01), None
Model 8800C Smart Vortex Flowmeter, Product Data Sheet, 00813-0100-4003, Rosemount Inc. (7 pages).
Model 8800A Vortex Flowmeter with FOUNDATION™ fieldbus, Product Data Sheet, 00813-0100-4772, Rosemount Inc. (8 pages).
Wood, Robert H., et al., “A Phase-Locked Loop for Driving Vibrating Tube Diameters,”Rev. Sci. Instrum., vol. 60, No. 3, Mar. 1989, pp. 493-494.
Kutin, Jo{hacek over (z)}e, et al., “Phase-Locking Control of the Coriolis Meter's Resonance Frequency Based on Virtual Instrumentation,”Sensors and Actuators A: Physical, 2003, pp. 86-93.
Clarke David W.
Ghaoud Tarek
Fish & Richardson P.C.
Hoff Marc S.
Invensys Systems Inc.
Raymond Edward
LandOfFree
Evaluating a vortex flow-meter signal does not yet have a rating. At this time, there are no reviews or comments for this patent.
If you have personal experience with Evaluating a vortex flow-meter signal, we encourage you to share that experience with our LandOfFree.com community. Your opinion is very important and Evaluating a vortex flow-meter signal will most certainly appreciate the feedback.
Profile ID: LFUS-PAI-O-3430983