Optical fiber sensors
US4749246A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Jun 10, 1987 |
| Grant date | Jun 7, 1988 |
| Priority date | — |
| Expiry date | Jun 10, 2007 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01D5/35383
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A distributed optical fiber sensor cable, for sensing perturbations such as pressure, comprises a length of optical fiber (10) and means adapted, in response to the perturbation to be sensed, to mechanically deform separate portions of the length of the fiber at sensing elements (11,12,13) periodically along their length in order to cause optical power launched into a mode of propagation in the core (14) and guided thereby to be coupled to an unguided mode, for example a cladding (15) mode. The coupling is optical wavelength selective and the separate sensing elements are each addressed with a different wavelength (.lambda..sub.11, .lambda..sub.12, .lambda..sub.13) for spatial resolution along the length of the cable.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.