Modulating a diameter-increasing step of a fiber preform with no modulation prior to a predetermined diameter
US6474105B1 · kind B1 · utility
2Cited by
12References
9Claims
0Family size
Assignee
Inventors
Key dates
| Filing date | Dec 22, 1995 |
| Grant date | Nov 5, 2002 |
| Priority date | — |
| Expiry date | Aug 27, 2018 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B37/01291
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
The method includes axially modulating at least one plasma build-up pass in order to improve the opto-geometrical properties of the preform. The modulation preferably takes place during the final passes of plasma build-up and takes place by modulating the build-up grain flow rate. The diameter of the preform is evaluated (6), and a build-up control device (8) regulates grain flow rate (11, 5) in application of the above method.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.