Apparatus for the production of preforms for optical fibers
US4944244A · kind A · utility
Assignee
Inventors
Key dates
| Filing date | Mar 14, 1989 |
| Grant date | Jul 31, 1990 |
| Priority date | — |
| Expiry date | Mar 14, 2009 |
Classification
- Technology area (CPC C)Chemistry; Metallurgy
- CPC primaryC03B37/0183
- WIPO fieldOther special machines
- WIPO sectorMechanical engineering
Abstract
It realizes the chemical vapour phase deposition method using a plasma maintained by surface waves in a tube (2) for obtaining a preform and comprises photodetection means (50) sensitive to the light emitted by the deposition area (54) of the vitreous coating resulting from the reaction between appropriate gaseous compounds and able to supply information relative to the emission area of said light, and means (52) for controlling the displacement of the deposition area, displacement being such that the thickness of the coating is uniform in the tube, and control means controlling the power of the microwave generator (30) of the apparatus as a function of the information. Application to the field of telecommunications.
Source: USPTO / EPO open patent data. Objective bibliographic and citation counts.