High resolution proximity detector employing magnetoresistive sensor disposed within a pressure resistant enclosure
US4922197A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Aug 1, 1988 |
| Grant date | May 1, 1990 |
| Priority date | — |
| Expiry date | Aug 1, 2008 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01P3/488
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A tachometer sensor adapted for measuring the rotation of a gear or spline shaft target within a high pressure environment includes an integrally formed housing having a generally tubular elongate probe defining a sealed interior cavity receiving an annular permanent magnet at the sensing end thereof, field focusing means such as a ferrous pin disposed concentrically with the permanent magnet to shape the field established thereby, at least one magnetoresistive transducer concentrically disposed with the magnet to detect distortions of the magnetic field effected by passage of the target and means in-circuit with the transducer which generates a usable output signals as a function of sensed magnet field distortion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.