Optical inspection system for cylindrical objects
- Richland, WA
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.
- Research Organization:
- Pacific Northwest National Laboratory (PNNL), Richland, WA
- Assignee:
- Battelle Memorial Institute (Richland, WA)
- Patent Number(s):
- US 4808001
- OSTI ID:
- 866854
- Country of Publication:
- United States
- Language:
- English
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