electro-optical detection of the form type and other defects on surfaces such as metal plates or plastic panels. Describes a method and a device for detecting and quantifying defects such as cracks, folds, depressions, flat spots, that result from the manufacture of materials handling and assembly process. In one embodiment (Fig. 3) the sensor device comprises a laser (201) for illuminating an area (220) of the surface to be examined. A retroreflective member (203) is positioned relative to the surface so that the Lumere reflected by the surface zone (220) is returned to the surface and is reflected back by it. A lens (210) produces an image with the return light via a beam splitter (213) on a detector (215)
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