Method for building up plasma on an optical fiber preform, while reducing nitrogen oxides
US7629032B2 · kind B2 · utility
Assignee
Inventors
Key dates
| Filing date | Dec 2, 2003 |
| Grant date | Dec 8, 2009 |
| Priority date | — |
| Expiry date | Jul 13, 2026 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B37/01426
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
A plasma buildup method for building up an optical fiber perform. The method includes the steps of: providing a plasma torch having an outlet nozzle adjacent to a primary perform, wherein an interaction zone is defined between the outlet nozzle and the primary preform; feeding the plasma torch with a plasma-generating gas in the presence of a silica-based material so as to deposit a buildup material on the primary preform; and introducing a reducing element into the interaction zone, the reducing element reacting to induce reduction of the nitrogen oxides produced by interaction between nitrogen and oxygen in the presence of the plasma generated by the torch.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.