Intelligent signal processor for vortex flowmeter

Details Intelligent signal processor for vortex flowmeter Intelligent signal processor for vortex flowmeter

2008-07-08

2008-07-08

Bui, Bryan (Department: 2863)

Data processing: measuring, calibrating, or testing

Measurement system in a specific environment

Mechanical measurement system

C702S077000, C073S861240

Reexamination Certificate

active

07398165

ABSTRACT:
The present invention discloses an intelligent signal processor of a vortex flowmeter, the signal processor mainly adopts a digital signal processor structure for processing a flow rate of a fluid. The signal processor uses two different algorithms, one primarily using a fast Fourier transformation (FFT) unit and an auto-correlation unit, and the other primarily using a fast Fourier transformation (FFT) unit and a digital software phase locked loop (SPLL) unit. As the flow rate varies with time, the two algorithms can track a vortex shedding frequency and reduce a vortex shedding frequency error. For maximum and minimum flow rates, a large difference of flow rates will not affect the precision of a measurement. If the flow rate ranges from 50 to 509 m3/hr, the precision is approximately equal to 0.59%˜0.35%, which has improved about 2˜3 times over the traditional processing method.

REFERENCES:
patent: 5429001 (1995-07-01), Kleven
patent: 6386046 (2002-05-01), Mattar
patent: 2006/0217899 (2006-09-01), Unsworth et al.

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