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Title: 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:
 [1];  [1]
  1. (Richland, WA)
Issue Date:
Research Org.:
Pacific Northwest National Laboratory (PNNL), Richland, WA
OSTI Identifier:
866854
Patent Number(s):
4808001
Assignee:
Battelle Memorial Institute (Richland, WA) PNNL
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 = {1989},
month = {1}
}

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