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:
Feb. 17, 2004
Filed:
Feb. 07, 2002
Paul D. Olivier, Scottsdale, AZ (US);
Other;
Abstract
A method and appartus for measuring volumetric flow through a duct without knowing the viscosity of the fluid is provided. A dual rotor turbine volumetric flow meter is operably connected to a duct having fluid flowing therethrough. The dual rotor turbine has a temperature gauge, a first rotor and a second rotor with at least one of said first rotor and said second rotor having a non-linear response to fluid flow. The dual rotor turbine volumetric flow meter is calibrated by deriving a Roshko/Strouhal number curve therefor. During measurement, a first rotor frequency and a second rotor frequency are determined. The second rotor frequency is divided by the first rotor frequency to derive a frequency ratio which is then used to calculate a combined Roshko number. A combined Strouhal number is derived by using the combined Roshko number in conjunction with the Roshko/Strouhal number curve. The volumetric flow rate is calculated using the combined Strouhal number.