Method for controlling fiber diameter during drawing

Details Method for controlling fiber diameter during drawing Method for controlling fiber diameter during drawing

1995-04-27

1996-09-03

Hoffmann, John M.

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

With measuring, controlling, sensing, programming, timing,...

65382, 65435, 365 731, C03B 3707

Patent

active

055519679

ABSTRACT:
A system for controlling the drawing of a hermetically-coated optical waveguide fiber from a preform is provided in which two measurements of fiber diameter are made and combined into an overall control signal. The first measurement is made on bare fiber in the region of the preform's root using an interference technique. The second measurement is made after the hermetic coating has been applied using a shadow technique. The first measurement provides high speed, high accuracy data needed for process control and defect detection. It is, however, subject to error due to fluctuations in the root with tractor speed. The second measurement reduces the effects of such error on the overall control signal.

REFERENCES:
patent: 4102661 (1978-07-01), Dudderar
patent: 4735856 (1988-04-01), Schultz
patent: 5237383 (1993-08-01), Parisi

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