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Proceedings Paper

A Novel Fibre Optic Illuminator for Machine Vision
Author(s): P Wagli; E Switzerland Morger
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Paper Abstract

A novel fibre optic illuminator with a spatially variable output light intensity distribution was built. By the aid of a semitransparent mirror and lens optics, this light distribution was projected onto the object to be imaged directly from the direction of observation. It was found that very homogeneous intensity distributions can be achieved in the image plane of the camera by compensating the cosine-fourth law of the camera optics. This allows for a constant, position independent threshold setting for digitizing the image. We will report on very favourable results obtained for the illumination of hybrid circuit boards and wafer surfaces. The influence of object size, surface quality (diffuse or highly reflective) and polarized light will be discussed.

Paper Details

Date Published: 17 November 1986
PDF: 6 pages
Proc. SPIE 0654, Automatic Optical Inspection, (17 November 1986); doi: 10.1117/12.938284
Show Author Affiliations
P Wagli, VOLPI AG (Germany)
E Switzerland Morger, VOLPI AG (Germany)

Published in SPIE Proceedings Vol. 0654:
Automatic Optical Inspection
Lionel R. Baker; H. John Caulfield, Editor(s)

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