Magnetic displacement transducer
US7521923B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Apr 22, 2003 |
| Grant date | Apr 21, 2009 |
| Priority date | — |
| Expiry date | Apr 22, 2023 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/14
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A transducer for measuring a displacement along an axis of movement of a first part relative to a second part, comprises a magnetic source for generating a magnetic field mounted to the first part, and a plurality of magnetic field sensing devices mounted to the second part to be movable relative to the magnetic field generated by the magnetic source. The sensing devices are spaced in the direction of the axis. A circuit arrangement is provided to which the sensing devices are connected to generate an output signal dependent on contributions from the sensing devices of the plurality. The magnetic source has North and South poles oriented in the direction of the axis. The sensing devices are each oriented to respond to an axially-directed component of magnetic field, and comprise at least two axially-spaced sensing devices whose contributions to the output signal are combined in a subtractive fashion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.