Electromagnetic flowmeter
US7496455B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Jun 10, 2005 |
| Grant date | Feb 24, 2009 |
| Priority date | — |
| Expiry date | Sep 23, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F1/60
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electromagnetic flowmeter includes a measuring tube (1) through which a fluid to be measured flows, electrodes (2a, 2b) 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 (3) and power supply unit (4) which apply a time-changing magnetic field to the fluid, a signal conversion unit (5) 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 (2a, 2b), and a flow rate output unit (6) 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.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.