State detection device
US7487052B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Sep 21, 2005 |
| Grant date | Feb 3, 2009 |
| Priority date | — |
| Expiry date | Sep 27, 2025 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01N27/72
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An exciting unit, applies, to a fluid, a time-changing magnetic field asymmetrical to a plane (PLN). An electrode is placed on the plane in a measuring tube, and detects a resultant electromotive force of an electromotive force based on ∂A/∂t component (A: vector potential, t: time) irrelevant to a flow velocity of the fluid and an electromotive force based on a v×B component originating from the flow velocity of the fluid. A state quantifying unit extracts the ∂A/∂t component and a variation factor dependent on a parameter to be detected, and quantifies the parameter on the basis of the variation factor. The characteristic and state of the fluid and the state in the measuring tube can be detected regardless of the flow rate of the fluid by using the same hardware arrangement as that of an electromagnetic induction type flowmeter.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.