Measurement method and magnetic sensor for the contactless detection of movements
US8878530B2 · kind B2 · utility
Assignee
Inventor
Key dates
| Filing date | Nov 26, 2010 |
| Grant date | Nov 4, 2014 |
| Priority date | — |
| Expiry date | Jul 12, 2031 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/145
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A measuring method of contactless magnetic detection of relative movement along a trajectory between a main creation system and a measuring system sensitive to the direction of the magnetic field, the creation system creating a main magnetic field of direction that varies in a plane detected by the measuring system to determine the relative position along that trajectory. The method includes subjecting the measuring system to a compensation magnetic field of direction that is fixed and opposite to the direction of the maximum main magnetic field measured by the measuring system and delivered uniquely by the main creation system and in determining the direction of a magnetic field resulting from the combination of the main magnetic field and the compensation magnetic field by measuring the two mutually-orthogonal components of the resultant magnetic field respectively varying substantially as cosine and sine functions of the angle of the resultant magnetic field.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.