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Proceedings Paper

Laser Scanning Systems For Image Acquisition
Author(s): G. M. Clarke; J. Bedford
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Paper Abstract

Conventional light sources in combination with mechanical scanning optical systems are severely limited in performance by significant aperture required to concentrate useful amounts of light into the scanning spot. The use of the laser source raises the figure of merit by several orders of magnitude which can be distributed between the various parameters of spot size, width covered and scan speed which multiply up to give very large bandwidth systems. The design of systems is described avoiding optical elements beyond the scanning polygon in order to obtain considerable flexibility in choice of scanned width and resolution from the one basic scanner design. The consequences of this are discussed along with the options on signal processing which include simple a.c. equalising of signal amplitude across the scan, to full digitally stored receiver/material reference profiles for long term d.c. stability required for example for on-line optical density monitoring. Multi channel receiver techniques for acquiring optical information for defect recognition systems are discussed and solutions to format accuracy in high resolution scanners.

Paper Details

Date Published: 25 February 1978
PDF: 7 pages
Proc. SPIE 0130, Automation and Inspection Applications of Image Processing Techniques, (25 February 1978); doi: 10.1117/12.956029
Show Author Affiliations
G. M. Clarke, Ferranti Limited (Scotland)
J. Bedford, Ferranti Limited (Scotland)

Published in SPIE Proceedings Vol. 0130:
Automation and Inspection Applications of Image Processing Techniques

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