The patent badge is an abbreviated version of the USPTO patent document. The patent badge does contain a link to the full patent document.
The patent badge is an abbreviated version of the USPTO patent document. The patent badge covers the following: Patent number, Date patent was issued, Date patent was filed, Title of the patent, Applicant, Inventor, Assignee, Attorney firm, Primary examiner, Assistant examiner, CPCs, and Abstract. The patent badge does contain a link to the full patent document (in Adobe Acrobat format, aka pdf). To download or print any patent click here.
Patent No.:
Date of Patent:
Oct. 13, 1998
Filed:
May. 21, 1997
John William Byrd, Huntsville, AL (US);
ADS Environmental Services, Inc., Huntsville, AL (US);
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.