Lightguide coating control

Details Lightguide coating control Lightguide coating control

1989-02-27

1990-08-28

Kratz, Peter

Glass manufacturing

Processes

Forming product or preform from molten glass

356 731, 356381, C03B 3723

Patent

active

049522264

ABSTRACT:
A laser (20) directs a laser beam at an optical fiber (12) and the resulting forward-scattered light is detected by a detector (21). The energy of the foward-scattered laser light is monotonically inversely proportional to the thickness of a carbon coating on the optical fiber. A computer (22) generates an electrical signal for controlling carbon coating thickness by driving a valve (24) to control the flow of acetylene from a source (14) used to coat the optical fiber in a coating chamber (13).

REFERENCES:
patent: 4027977 (1977-06-01), Frazee et al.
patent: 4210431 (1980-07-01), Balman et al.
patent: 4450333 (1984-05-01), Andrejco
Greenlad , "Measument & Control of the Thickness of Thin Films", Vacuum, vol. II, No. 3, 7/1952 pp. 216-230.
Smithgall, D. H. et al., "High-Speed Meaurement and Control of Fiber-Coating Concentricity", The Bell System Technical Journal, vol. 60, No. 9, 11/81, pp. 2065-2080.
Eichenbaum, B. R., "The Centering of Optical Fiber Coatings by Monitoring Forward Scattering Patterns--Theory and Practice", The Bell System Technical Journal, vol. 59, No. 3, 3/80, pp. 313.
Watkins, L. S., "Scattering From Side-Illuminated Clad Glass Fibers for Determination of Fiber Parameters", Journal of the Optical Society of America, vol. 64, No. 6, 6/74, pp. 767-772.

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