Optical waveguide preform measurement during manufacture

Details Optical waveguide preform measurement during manufacture Optical waveguide preform measurement during manufacture

1994-07-25

1996-09-24

Simmons, David A.

Glass manufacturing

Processes of manufacturing fibers, filaments, or preforms

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

65484, 65485, 65491, C03B 3707

Patent

active

055586929

ABSTRACT:
An apparatus and method for measuring preform diameter and runout during manufacture of the preform. A Keyence LB1201 displacement gauge is used to determine distance between a sensing unit and the surface of an optical waveguide preform. It was found that the gauge produced an alternating signal imposed on a constant signal. By dividing the signal into its constant and alternating components, preform diameter and runout can be measured. A water cooled band pass filter and housing are used to protect the sensing unit.
The preform surface can be mapped using a pair of sensing units, capable of moving parallel to the preform axis of rotation, located in diametric opposition about the preform.

REFERENCES:
patent: 5192350 (1993-03-01), Le Sergent
patent: 5221306 (1993-06-01), Fleming, Jr. et al.

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