Method for monitoring the concentricity of plastic coatings on o

Details Method for monitoring the concentricity of plastic coatings on o Method for monitoring the concentricity of plastic coatings on o

1977-01-31

1978-11-07

McGraw, Vincent P.

Coating processes

Measuring, testing, or indicating

356 731, 427 10, 356429, G01B 902, G01N 2130

Patent

active

041247280

ABSTRACT:
The concentricity or eccentricity of a plastic coating on an optical fiber is determined by monitoring the absence or presence, respectively, of a particular intensity peak in the backscattered light pattern generated by a light beam incident upon the fiber as the fiber is drawn, coated and pulled through the light beam. The particular intensity peak monitored results from the rays of minimum deviation which traverse the optical fiber only once as the incident rays are refracted and reflected through the coated fiber to form the backscattered light pattern. The position of the coating applicator is automatically adjusted if this intensity peak is electronically detected.

REFERENCES:
patent: 4042723 (1977-08-01), Presby

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