Optical waveguide sensor arrangement having guided modes-non guided modes grating coupler
US5641956A · kind A · utility
Assignees
Inventors
Key dates
| Filing date | Feb 2, 1996 |
| Grant date | Jun 24, 1997 |
| Priority date | — |
| Expiry date | Feb 2, 2016 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/02195
- WIPO fieldOptics
- WIPO sectorInstruments
Abstract
An optical waveguide sensor arrangement for sensing at least one physical parameter is provided. This arrangement comprises an optical waveguide having guided modes, lossy non-guided modes, and a long period grating coupling the guided modes to the lossy non-guided modes wherein the long period grating produces a wavelength transmission spectrum functionally dependent on the physical parameter sensed. A source means provides light to the optical waveguide sensor and an optoelectronic detector, which is positioned in an operable relationship to the optical waveguide sensor, detects light transmitted through the optical waveguide sensor. Lastly, a processing means is attached to the optoelectronic detector for correlating the wavelength transmission spectrum with a numerical value for the physical parameter sensed. The physical parameters sensed by the optical waveguide sensor include: temperature, strain, shape, refractive index and corrosion.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.