Fiber optic sensor
US4787741A · kind A · utility
37Cited by
8References
29Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Oct 9, 1986 |
| Grant date | Nov 29, 1988 |
| Priority date | — |
| Expiry date | Oct 9, 2006 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01H9/004
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
There is provided a fiber optic sensor for sensing environmental effects on counterpropagating light beams in an optical loop by comparing the modulation of the light beams in an optical coil exposed to the environmental effects and comparison with a reference fiber shielded from the environmental effects. The counterpropagating light paths contain optical phase modulators for creating nonreciprocal phase shifts and may comprise elongated sections forming a long line array.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.