Fiber optic sensor for measuring gas
US5280172A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Nov 12, 1992 |
| Grant date | Jan 18, 1994 |
| Priority date | — |
| Expiry date | Nov 12, 2012 |
Classification
- Technology area (CPC G)Physics
- CPC primaryG02B6/02195
- WIPO fieldMeasurement
- WIPO sectorInstruments
Abstract
This is a system of fibre optic sensors comprising at least one such fibre for measuring a physical or chemical parameter sensitive to the change in an environment (E) within which the sensor is placed, the said fibre comprising a cladding (3), a core (5) surrounded by this cladding, an axis (7) with a length in the direction of this axis, and, locally along its parts (9) with variations in optical thickness forming an optical diffraction grating (10), at least one part of the cladding (3) comprising in its composition an active material whose optical properties vary as a function of the change in the said parameter (P) within the environment where the sensor is placed. The active material may be a heteropolysiloxane.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.