Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1991-12-31
1993-02-09
McGraw, Vincent P.
Optics: measuring and testing
For optical fiber or waveguide inspection
356239, G01N 2188, G01N 2189
Patent
active
051856360
ABSTRACT:
Methods for deteting defects, such as, holes or voids, in optical waveguide fibers are provided. The methods employ far-field interference patterns produced by transversely illuminating the fiber with a laser beam. Holes in the fiber produce a characteristic peak in the spatial frequency spectrum of the interference pattern which subdivides into two peaks which migrate in opposite directions as a hole grows in size. Holes also produce a characteristic increase in the total power of the interference pattern, the amount of the increase being a linear function of the size of the hole for holes having a diameter less than about 60% of the diameter of the fiber. The hole detection methods are incorporated in an overall system for controlling the drawing of optical waveguide fibers.
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"Measurement of Optical Fiber Diameter Using the Fast Fourier Transform", Mustafa A.G. Abushagur and Nicholas George, Applied Optics, Jun. 15, 1980, vol. 19, No. 12, pp. 2031-2033.
Button Leslie J.
Dotson Jerald B.
Reding Bruce W.
Wightman Christopher W.
Corning Incorporated
McGraw Vincent P.
Taylor, Jr. K. McNeill
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