Position sensor for generating a voltage changing proportionally to the position of a magnet
US4774465A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Feb 6, 1987 |
| Grant date | Sep 27, 1988 |
| Priority date | — |
| Expiry date | Feb 6, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2033
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A sensor for identifying the position of a test object has a strip-shaped core of low magnetic coercivity which is magnetized with opposite polarities by two excitation coils disposed at opposite ends of the core, and a secondary coil wrapped around the core between the two excitation coils. The test object generates a magnetic field which saturates the core at a location corresponding to the position of the test object between the two excitation coils, thereby simulating an air gap in the core at this location. The voltage across the terminals of the secondary coil changes in accordance with the position of the simulated air gap, thus providing a signal indicating the position of the test object.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.