Inductive sensor for detecting displacement of adjacent surfaces
US4816759A · kind A · utility
37Cited by
7References
10Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 28, 1987 |
| Grant date | Mar 28, 1989 |
| Priority date | — |
| Expiry date | Oct 28, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/243
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An inductive displacement sensor includes an oscillator circuit that is characterized by primary and secondary pairs of coils disposed on opposing surfaces of adjacent optical segments. Each coil in both coil pairs is alternately positioned along a respective axes perpendicular to a segment displacement axis. The secondary coils are respectively tuned to frequencies above and below the oscillator circuit resonant frequency. Any motion between segments along the displacement axis induces a detectable change in phase between the current and voltage of the oscillator signal.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.