25 February 1978 Laser Scanning Systems For Image Acquisition
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Proceedings Volume 0130, Automation and Inspection Applications of Image Processing Techniques; (1978) https://doi.org/10.1117/12.956029
Event: Automation and Inspection Applications of Image Processing Techniques, 1977, London, United Kingdom
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.
© (1978) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
G. M. Clarke, G. M. Clarke, J. Bedford, J. Bedford, "Laser Scanning Systems For Image Acquisition", Proc. SPIE 0130, Automation and Inspection Applications of Image Processing Techniques, (25 February 1978); doi: 10.1117/12.956029; https://doi.org/10.1117/12.956029

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