Position sensor and system
US4401986A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 26, 1979 |
| Grant date | Aug 30, 1983 |
| Priority date | — |
| Expiry date | Dec 26, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/204
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A non-contacting position sensor has an exciting coil disposed in a plane and has a sensing coil located in an intersecting plane so that portions of the sensing coil are disposed symmetrically around a portion of the exciting coil in mutually inductive relation to that portion of the exciting coil. Ferrite means magnetically shield those sensing coil portions from other portions of the exciting coil and housing means are provided to mount the sensor so that those coil portions are conveniently positioned for relative movement with respect to magnetically permeable or electrically conductive inductance-modifying means on an object whose position is to be monitored. Movement of the inductance-modifying means as the object moves then modifies the mutual inductance between the respective sensing coil portions and the exciting coil portion so that, when the exciting coil is driven, the sensing coil provides a signal which is accurately and reliably representative of the object position. If desired, an additional sensing coil is disposed in a third plane intersecting the two previously noted planes to provide X-Y position sensing. The inductive position sensor is inexpensive, is indepen…
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.