Method for detecting bubbles and inclusions present in optical f

Details Method for detecting bubbles and inclusions present in optical f Method for detecting bubbles and inclusions present in optical f

1993-08-25

1995-04-11

McGraw, Vincent P.

Optics: measuring and testing

For optical fiber or waveguide inspection

356239, 356426, G01N 2188

Patent

active

054063744

ABSTRACT:
A method and an apparatus for accurately, thoroughly and automatically inspecting an optical fiber preform for the presence of bubbles and/or inclusions are herein provided. The inspection apparatus comprises light source 2 for making light rays incident upon the end face 1a of rod-like optical fiber preform 1 as a subject to be inspected, video camera 7 for photographing the side face of the optical fiber preform 1 and image-processing circuit 11 for discriminating and detecting bubbles and/or inclusions present in the preform 1 through processing of image signals outputted from the video camera 7 and inputted to the circuit 11.

REFERENCES:
patent: 4162125 (1979-07-01), Schmidt
patent: 4571077 (1986-02-01), Skeldon

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