T.V. -AIDED FLAW DETECTION USING ROTATING IMAGE TECHNIQUES

Rapid and automatic inspection of a light transparent, circumferentially bounded region of a workpiece to detect opaque flaws located in the region is accomplished by aligning the center of curvature of the region with the center of the field of view of a video camera and rotating the image of the r...

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Bibliographic Details
Main Authors RICHARD A. HARRIS, FRANK H. BLITCHINGTON JR
Format Patent
LanguageEnglish
Published 07.03.1972
Subjects
INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIRCHEMICAL OR PHYSICAL PROPERTIES
MEASURING
PHYSICS
TESTING
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Summary:Rapid and automatic inspection of a light transparent, circumferentially bounded region of a workpiece to detect opaque flaws located in the region is accomplished by aligning the center of curvature of the region with the center of the field of view of a video camera and rotating the image of the region in the field of view by means of a dove prism or the like. Circuitry synchronized with the horizontal sweep and vertical scan of the camera establishes a reference pulse when a predetermined search area of the field of view located in the path of rotation of the annular region image is scanned by the camera. Upon rotation of the image of an opaque flaw in the region through the predetermined search area, the video pulse output of the camera coincidence gate generates an output indication representative of the presence of the flaw.
Bibliography:Application Number: USD3647961