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:
Apr. 14, 2009
Filed:
Feb. 16, 2005
Eric Foucault, Poitiers, FR;
Philippe Szeger, Saint Julien L'Ars, FR;
Janick Laumonier, Poitiers, FR;
Philippe Micheau, Rock Forest, CA;
Eric Foucault, Poitiers, FR;
Philippe Szeger, Saint Julien L'Ars, FR;
Janick Laumonier, Poitiers, FR;
Philippe Micheau, Rock Forest, CA;
Center National de la Recherche Scientifique (CNRS), Paris, FR;
Universite de Poitiers, Poitiers, FR;
Abstract
The invention makes it possible to measure, in real time, the flow of a fluid that is incompressible while having an unsteady flow. The pressure measuring system is primarily comprised of a negative-pressure element () placed within the flow and provided with two wall pressure taps (A, B). A means () for measuring a pressure difference connected to the pressure taps (A, B) enables the following formula to be solved: dq(t)/dt+α(q(t))=β×Δp(t) directly stemming from fundamental equations of fluid mechanics and/or: Δp(t) represents the pressure difference measured by the sensor; q(t) represents the sought volume flow rate, and; α represents a function of the geometry of the negative-pressure element, of the fluid and of the flow q(t), the particularity of this formula being the consideration of the direction of flow in the second term of the left member of the formula.