Optical Enhancement Of Surface Contour Variations For Sheet Metal And Plastic Panel Inspection

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Abstract
The use of the DiffractoSight (D Sight) technique, is shown to be an effective inspection method for the observation, rating and cataloguing of defects on sheet metal and plastic automotive body panels. Using a standard television camera and a high intensity light source, in conjunction with a retroreflective screen, small localized slope variations in a surface can be converted to grey scale information. The benefits of the system are highlighted by its essential simplicity, high sensitivity to contour changes, low sensitivity to part positioning and its wide field of view capability. The technique is shown to have much to offer in improving process control and monitoring product quality in the stamping, composite and molding industry. Results from laboratory and field installations are used to verify the advantages of the D Sight' approach to surface quality inspection.© (1989) COPYRIGHT SPIE--The International Society for Optical Engineering. Downloading of the abstract is permitted for personal use only.

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