Optics: measuring and testing – Inspection of flaws or impurities – Having predetermined light transmission regions
Patent
1997-03-11
1998-07-28
Font, Frank G.
Optics: measuring and testing
Inspection of flaws or impurities
Having predetermined light transmission regions
356239, 356 731, 356430, 25022729, 2502273, 25022731, 25055942, 25055943, 25055945, G01N 2100, G01N 2184, G01B 910
Patent
active
057868913
ABSTRACT:
The present invention provides an optical detection system for detecting defects in an optical fiber. The system includes a light source for coupling light into the secondary coating of an optical fiber at a preselected angle with respect to the longitudinal axis of the fiber and an optical detector positioned adjacent the fiber at a preselected distance from the point at which the light is coupled into the fiber coating. In accordance with one embodiment, the light is coupled into the fiber coating at a sufficiently shallow angle with respect to the longitudinal axis of the fiber to cause the light to travel through the coating in a direction substantially parallel to the axis of the optical fiber for some distance before exiting the coating. By placing the detector a preselected distance from the coupling point, detection of light reflected from the fiber at the coupling spot is avoided and only light reflected by defects contained in the primary or secondary coating layers, or light reflected by delaminations between the primary coating layer and the fiber, will be detected by the detector.
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Brewer Tracy E.
Jakobsen Christian
Karp Aarne
Pedersen Flemming
Penn Leonardo M.
Font Frank G.
Lucent Technologies - Inc.
Merlino Amanda
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