Optical inspection system for cylindrical objects

Details Optical inspection system for cylindrical objects Optical inspection system for cylindrical objects

G - Physics

01

N

340/124.6

G01N 21/89 (2006.01)

Patent

CA 1293309

OPTICAL INSPECTION SYSTEM FOR CYLINDRICAL OBJECTS ABSTRACT In the inspection of cylindrical objects, partic- ularly O-rings, the object is translated through a field of view and a linear light trace is projected on its surface. An image of the light trace is projected on a mask, which has a size and shape corresponding to the size and shape which the image would have if the surface of the object were perfect. If there is a defect, light will pass the mask and be sensed by a detector positioned behind the mask. Preferably, two masks and associated detectors are used, one mask being convex, to pass light when the light trace falls on a projection from the surface and the other concave, to pass light when the light trace falls on a depression in the surface. The light trace may be either dynamic, formed by a scanned laser beam, or static, formed by such a beam focussed by a cylindrical lens. Means are provided to automatically keep the illuminating and receiving systems properly aligned.

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