Methods and apparatus for fabricating a lightguide preform

Details Methods and apparatus for fabricating a lightguide preform Methods and apparatus for fabricating a lightguide preform

1981-10-01

1983-06-21

Fisher, Richard V.

Glass manufacturing

Processes

Forming product or preform from molten glass

65 182, 65 29, 65161, 118692, 118730, C03B 1900

Patent

active

043892299

ABSTRACT:
Undeposited reactants (i.e., soot) passing through a glass substrate tube (12), during the fabrication of a lightguide perform by the Modified Chemical Vapor Deposition (MCVD) process, flow into a reactant exhaust system (50) and are carried therethrough by a uniformly flowing reactant-free gas. The reactants pass through an exhaust tube (52), a reactant collection chamber (54), through a pressure control apparatus (56;114) and into a gas scrubber. The pressure within the exhaust system (50) is maintained substantially constant during the MCVD process by continuously monitoring the pressure therein and adjusting the pressure control apparatus (56;114) accordingly. Additionally, a continuous, uniform flow of soot-free gas is directed into the exhaust system to assist in the removal of the undeposited reactants therefrom.

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Okada et al., "Improved Chemical Vapour Deposition Method . . . ", Electronic Letters, vol. 14, No. 4, Feb. 16, 1978, pp. 89-90.

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