Optics: measuring and testing – For optical fiber or waveguide inspection
Patent
1984-06-08
1987-01-06
Willis, Davis L.
Optics: measuring and testing
For optical fiber or waveguide inspection
356237, 356387, G01N 2188, G01B 1108
Patent
active
046342737
ABSTRACT:
A method is provided to inspect a resiliently deflectable O-ring which tends to distort under the influence of its own weight. The O-ring is placed on a transparent support member with the central axis of the O-ring in a vertical orientation. Light is directed toward the O-ring and through the support member to cause the O-ring to cast a shadow. The distance between portions of the shadow cast by diametrically spaced apart portions of the O-ring indicate diametral measurements of the O-ring. The distance between radial edge portions of the shadow cast by the O-ring indicates the thickness of the O-ring. To detect surface flaws in the O-ring, light is directed against a small area on the surface of the O-ring while it is rotated. A variation in the characteristics of the reflected light indicates the presence of a flaw in the surface of the O-ring. To provide for scanning of inner and outer surface areas of the O-ring to detect surface flaws, the O-ring may be rotated about an axis which extends perpendicular to the central axis of the O-ring and is tangential to a circle through the center of the cross section of the O-ring.
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Farleman Ronald K.
Fetheroff Charles W.
Matay Istvan M.
Koren Matthew W.
TRW Inc.
Willis Davis L.
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