Apparatus for measuring axial movement of a rotating member
US4737709A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Aug 14, 1986 |
| Grant date | Apr 12, 1988 |
| Priority date | — |
| Expiry date | Aug 14, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B7/02
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A device for detecting axial movement of a rotating member, for example a compressor rotor of a gas turbine engine, comprises a conducting wire spaced radially from the rotating member, and a magnet carried by the rotating member passes in proximity to the conducting wire when the rotating member is rotating. The conducting wire has a first limb a second limb and a third limb extending with axial and circumferential components, the first and third limbs extending in the circumferentially opposite direction to the second limb to increase resolution between pulsed e.m.f.'s produced when the magnet crosses the limbs. The first, second and third limbs are each formed from a pair of parallel connected bars to produce positive and negative pulsed e.m.f.'s which form zero crossing points which are more easily detected. This enables operation at greater radial clearance or lower rotating speeds.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.