Fibre optic grating sensor
US6768098B1 · kind B1 · utility
3Cited by
8References
52Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Jan 24, 2002 |
| Grant date | Jul 27, 2004 |
| Priority date | — |
| Expiry date | Jan 24, 2022 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG01B11/18
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
A fiber optic grating sensor (10) comprising an optical fiber (12) in which a grating portion (14) is provided, the refractive index (16) of the fiber (12) varying periodically along the grating portion (14). The periodic variation of the refractive index (16) has an amplitude envelope which includes, in this example, two regions (24) in which the amplitude of the envelope is substantially reduced, and in this example is substantially nulled. The null regions (24) give the grating portion a spectral profile (20) within which there are, in this example two pass bands (18).
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.