Magnetic field vector sensor
US8653813B2 · kind B2 · utility
Assignees
Inventors
Key dates
| Filing date | Nov 14, 2012 |
| Grant date | Feb 18, 2014 |
| Priority date | — |
| Expiry date | Nov 14, 2032 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01R33/038
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A magnetic field vector sensor includes a substrate parallel to a plane, a support mobile relative to it and rotatable about a vertical rotation axis perpendicular to it, a magnetic field source generating a field having a moment in a non-perpendicular direction, the source being fixed to the support with no degree-of-freedom to exert torque on the support when a field to be measured is present, the field being non-collinear with the moment, a transducer to convert torque exerted on the support into a field amplitude of a component of the field along a measurement axis in the plane, wherein the source comprises a magnetostrictive permanent magnet for generating the field having a moment whose direction varies with stress on the magnet, and wherein the sensor further comprises a controllable device to reversibly modify the moment direction, and a stress generator to vary stress and hence moment direction.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.