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. 24, 2009
Filed:
Jun. 10, 2005
Tomoshige Yamamoto, Tokyo, JP;
Tomoshige Yamamoto, Tokyo, JP;
Yamatake Corporation, Tokyo, JP;
Abstract
An electromagnetic flowmeter includes a measuring tube () through which a fluid to be measured flows, electrodes () which are placed in this measuring tube and detect an electromotive force generated by a magnetic field applied to the fluid and the flow of the fluid, an exciting coil () and power supply unit () which apply a time-changing magnetic field to the fluid, a signal conversion unit () which extracts a ∂A/∂t component from the resultant electromotive force of the electromotive force based on the ∂A/∂t component irrelevant to the flow velocity of the fluid and the electromotive force based on a v×B component originating from the flow velocity of the fluid, which are detected by the electrodes (), and a flow rate output unit () which extracts only the v×B component by removing the extracted ∂A/∂t component from the resultant electromotive force, and calculates the flow rate of the fluid based on the v×B component.