Detection device
US7132825B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Aug 6, 2002 |
| Grant date | Nov 7, 2006 |
| Priority date | — |
| Expiry date | Jan 27, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2266
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for detecting the displacement of an object comprising a ferromagnetic material, comprises a magnetic circuit generator provided with first and a second cores made of ferromagnetic material and an excitation coil and a measurement coil. The magnetic circuit generator is connected to a detecting unit designed to detect a reluctance variation brought about in the circuit by the displacement of the object and to deduce therefrom its position. In the device, the magnetic circuit generator comprises first and second transformers with open magnetic circuit, the transformers being juxtaposed and comprise each an axis extending across their respective core, the axes extending substantially perpendicular to the path. The excitation coil comprises two coils connected in series which form the primary windings of the first and second transformers. The measurement coil comprises two coils connected in series which form the secondary windings of the first and second transformers, the primary and secondary windings being connected in opposite phase.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.