Electromagnetic flowmeter for applying a magnetic field and a plurality of frequency components to a fluid
US7434478B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Apr 8, 2005 |
| Grant date | Oct 14, 2008 |
| Priority date | — |
| Expiry date | Jul 15, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01F25/10
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An electromagnetic flowmeter includes a measuring tube through which a fluid flows, electrodes which detect an electromotive force generated by a magnetic field applied to the fluid. An exciting coil applies, to the fluid, a magnetic field asymmetrical to a plane (PLN) which includes the electrodes and is perpendicular to the axial direction of the measuring tube. A signal conversion unit extracts a ∂A/∂t component from the resultant electromotive force of the electromotive force. A flow rate output unit removes a variation factor for a span as a coefficient applied to the magnitude of the flow velocity on the basis of the ∂A/∂t component, and calculates the flow rate of the fluid from the result obtained by removing the variation factor. The exciting coil applies the magnetic fields including the plurality of frequency components to the fluid.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.