E/U core linear variable differential transformer for precise displacement measurement
US5469053A · kind A · utility
Assignee
Inventor
Key dates
| Filing date | Nov 2, 1992 |
| Grant date | Nov 21, 1995 |
| Priority date | — |
| Expiry date | Nov 2, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/2291
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
The present invention relates to a displacement sensor for measuring submicroinch displacements. An LVDT is constructed from an E core having a primary winding on the center pole piece and two secondary windings about two additional pole pieces. The E core device is mounted on a stationary surface opposite a pair of U cores mounted on a translating surface. The U cores are spaced adjacent to each other, having an axis defined coincident with the axis of the E core pole piece which supports the primary winding. This position produces a null voltage from the differentially-connected secondary windings. Linear displacement between the U core and E core results in different coupling between the secondary windings and primary windings. The resulting voltage difference is a measurement of displacement .DELTA.X.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.