METHOD FOR MONITORING THE CONCENTRICITY OF PLASTIC COATINGS ON OPTICAL FIBERS

摘要

METHOD FOR MONITORING THE CONCENTRICITY OF PLASTIC COATINGS ON OPTICAL FIBERS 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 bac 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.