Optics: measuring and testing – By configuration comparison – With comparison to master – desired shape – or reference voltage
Patent
1988-05-25
1989-02-28
Evans, F. L.
Optics: measuring and testing
By configuration comparison
With comparison to master, desired shape, or reference voltage
356398, G01B 1100
Patent
active
048080012
ABSTRACT:
In the inspection of cylindrical objects, particularly 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 receiving systems properly aligned.
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Product Bulletin: Model VLS-200 (Video-Laser-Shape) Laser/TV Scanner-Applied Scanning Technology--May 28, 1985.
Brenden Byron B.
Peters Timothy J.
Battelle (Memorial Institute)
Evans F. L.
Hauth Joseph J.
Sharp Robert Keith
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