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Proceedings Paper

Shadow Vision
Author(s): A. Stephen Mihalik Jr.; John Vala
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Paper Abstract

Shadow Vision: determining the dimension and position of an object by measuring its shadow cast from a collimated (parallel) light source. This alternative technology for measurement and inspection tasks such as edge detection, dimension measurement, and web inspection is presented. An explanation of shadow vision and differences from conventional systems is described with application examples. A modular collimated light source design is discussed which produces a beam approximately one inch high by seven inches wide. The beam can be extended to virtually any width. Discussion of recent developments in amorphous materials shows how a linear array photosensor is produced on a steel substrate having densities higher than in previous technologies. A sensor unit has been developed using these photodiodes with densities of 30 to 40 photodiodes per inch. It too can be made virtually any width.

Paper Details

Date Published: 12 October 1988
PDF: 6 pages
Proc. SPIE 0956, Piece Recognition and Image Processing, (12 October 1988); doi: 10.1117/12.947690
Show Author Affiliations
A. Stephen Mihalik Jr., Ovonic Imaging Systems, Inc. (United States)
John Vala, Ovonic Imaging Systems, Inc. (United States)

Published in SPIE Proceedings Vol. 0956:
Piece Recognition and Image Processing
Wayne Wiitanen, Editor(s)

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