Environmentally independent fiber optic rotation sensor
US4461574A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Dec 18, 1979 |
| Grant date | Jul 24, 1984 |
| Priority date | — |
| Expiry date | Dec 18, 1999 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01C19/72
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An environmentally independent fiber optic rotation sensor having a polarizer or polarization filter interposed between each beam coupler and the beamsplitter of the rotation sensor. The polarizers permit the passing of the polarization of the beams therethrough while rejecting the cross-polarized waves of the beams thereby causing a co-polarized mode of operation to take place. As a result of the co-polarized mode of operation the rotation sensor is unaffected by the surrounding environmental conditions. However, in so doing, the rotation sensor is subject to spurious fringe patterns which take place at the fiber ends. Elimination of these fringe patterns take place at the input side of the rotation sensor rather than at the output side in order to produce satisfactory rotation sensing.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.