Optical fiber bragg grating coating removal detection
US6885785B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Jul 19, 2004 |
| Grant date | Apr 26, 2005 |
| Priority date | — |
| Expiry date | Jul 19, 2024 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/02104
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
An optical corrosion sensor employs an optical fiber Bragg grating 20 embedded within an optical fiber 18. The grating 20 has a coating 40 made of a material, such as aluminum, which corrodes or can otherwise be removed. The coating 40 exerts forces 46 radially inward around and along the grating 20 so as to cause the wavelength bandwidth of the grating reflectivity profile to become broader and to be shifted relative to its uncoated condition. Also, the forces on the grating 20 are reduced when the coating corrodes, thereby causing the wavelength bandwidth and shift of the reflectivity profile of the grating to narrow and to return to its uncoated condition.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.