Fiber optic hot spot detector
US4298794A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 23, 1980 |
| Grant date | Nov 3, 1981 |
| Priority date | — |
| Expiry date | Jun 23, 2000 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/4469
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
A hot spot detector for a power cable, or the like, includes an optical fiber having a plurality of cores including an input core into which light energy is coupled. The core diameters, spacing, and materials of the cores and the cladding are carefully selected so that cross-talk from the input core to the secondary cores occurs only in the vicinity of the point along the fiber where the hot spot is located. Light energy then propagates along the secondary cores and modal interference causes a beat phenomena producing spatial interference that can be analyzed as energy flow between the secondary cores. By measuring the light intensity patterns emerging from the secondary cores at at least two distinct wavelengths, the location of the hot spot along the fiber can be calculated.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.