Liquid velocity measurement using curve fitting for peak velocit

Details Liquid velocity measurement using curve fitting for peak velocit Liquid velocity measurement using curve fitting for peak velocit

1997-05-21

1998-10-13

Chilcot, Richard

Measuring and testing

Volume or rate of flow

By measuring vibrations or acoustic energy

G01F 166

Patent

active

058214275

ABSTRACT:
In the particular embodiments described in the specification, the velocity of a flowing liquid is measured by emitting acoustic signals from an acoustic signal unit into the flowing liquid and detecting signals reflected from solid particles moving with the liquid and a Fast Fourier Transform is performed on the Doppler frequency signals to produce a power signal spectrum. The resolution of the power signal spectrum is expanded at the high frequency end by taking the square root of the power signals and a least squares curve fitter produces a trend line from the data points at the upper end of the spectrum. The trend line is extrapolated to the zero amplitude axis to produce a signal representing the maximum velocity of the flowing liquid and an algorithm based on the shape of the conduit through which the liquid is flowing is used to produce a signal representing the average velocity of the liquid. That value, combined with a signal representing the level of the liquid, is used to determine the volume flow rate of the liquid.

REFERENCES:
patent: 5226328 (1993-07-01), Petroff et al.
patent: 5271404 (1993-12-01), Corl et al.
patent: 5333508 (1994-08-01), Petroff et al.
patent: 5421211 (1995-06-01), Heckman
patent: 5521883 (1996-05-01), Fage et al.
patent: 5582176 (1996-12-01), Swerling et al.

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