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12 October 1988 Shadow Vision
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Proceedings Volume 0956, Piece Recognition and Image Processing; (1988) https://doi.org/10.1117/12.947690
Event: SPIE International Symposium on Optical Engineering and Industrial Sensing for Advance Manufacturing Technologies, 1988, Dearborn, MI, United States
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.
© (1988) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
A. Stephen Mihalik Jr. and John Vala "Shadow Vision", Proc. SPIE 0956, Piece Recognition and Image Processing, (12 October 1988); https://doi.org/10.1117/12.947690
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