Methods of and apparatus for vapor delivery control in optical p

Details Methods of and apparatus for vapor delivery control in optical p Methods of and apparatus for vapor delivery control in optical p

1984-08-02

1986-04-15

Camby, John J.

Heating

Processes of heating or heater operation

219271, 261 22, 261125, 432266, F27D 2300, F27B 1700, F22B 128, B01D 4702

Patent

active

045824800

ABSTRACT:
A vapor delivery system for the manufacture of an optical preform includes a deposition bubbler (60) and another bubbler (40) referred to as a supply bubbler which is interposed between a reservoir (24) of a liquid and the deposition bubbler. Heat energy is applied to the supply bubbler and to the deposition bubbler to vaporize liquid therein. A carrier gas is introduced into the liquid in the supply bubbler at a location below the free surface and into the deposition bubbler to cause vapor of the liquid to become entrained in the carrier gas and to flow from the supply bubbler into the deposition bubbler and from the deposition bubbler to a substrate tube from which an optical preform is made. Facilities are provided for maintaining sufficient liquid in the supply bubbler and suitable temperatures of the liquid in the supply and deposition bubblers to control the vapor flow into and out of the deposition bubbler to prevent unintended perturbations in the deposition bubbler. As a result, the concentration level of the vapor which is entrained in the carrier gas and delivered to the substrate tube is maintained at a substantially constant value.

REFERENCES:
patent: 3826560 (1974-07-01), Schultz
patent: 4140735 (1979-02-01), Schumacher
patent: 4217027 (1980-08-01), MacChesney
patent: 4235829 (1980-11-01), Partus
patent: 4276243 (1981-07-01), Partus
patent: 4408116 (1983-10-01), Turner

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