Optical inspection system for cylindrical objects
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.
- Inventors:
-
- Richland, WA
- Issue Date:
- Research Org.:
- Pacific Northwest National Laboratory (PNNL), Richland, WA (United States)
- OSTI Identifier:
- 866854
- Patent Number(s):
- 4808001
- Assignee:
- Battelle Memorial Institute (Richland, WA)
- Patent Classifications (CPCs):
-
G - PHYSICS G01 - MEASURING G01N - INVESTIGATING OR ANALYSING MATERIALS BY DETERMINING THEIR CHEMICAL OR PHYSICAL PROPERTIES
- DOE Contract Number:
- 23111 07105
- Resource Type:
- Patent
- Country of Publication:
- United States
- Language:
- English
- Subject:
- optical; inspection; cylindrical; particularly; o-rings; translated; field; view; linear; light; trace; projected; surface; image; mask; size; shape; corresponding; perfect; defect; pass; sensed; detector; positioned; preferably; masks; associated; detectors; convex; falls; projection; concave; depression; dynamic; formed; scanned; laser; beam; static; focussed; lens; means; provided; automatically; illuminating; receiving; systems; properly; aligned; light trace; cylindrical lens; laser beam; optical inspection; properly aligned; pass light; beam focus; near light; /356/
Citation Formats
Brenden, Byron B, and Peters, Timothy J. Optical inspection system for cylindrical objects. United States: N. p., 1989.
Web.
Brenden, Byron B, & Peters, Timothy J. Optical inspection system for cylindrical objects. United States.
Brenden, Byron B, and Peters, Timothy J. Sun .
"Optical inspection system for cylindrical objects". United States. https://www.osti.gov/servlets/purl/866854.
@article{osti_866854,
title = {Optical inspection system for cylindrical objects},
author = {Brenden, Byron B and Peters, Timothy J},
abstractNote = {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.},
doi = {},
journal = {},
number = ,
volume = ,
place = {United States},
year = {Sun Jan 01 00:00:00 EST 1989},
month = {Sun Jan 01 00:00:00 EST 1989}
}