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Proceedings Paper

Effects of spherical aberration on the laser beam of a bar code scanner
Author(s): Hong Tang
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Paper Abstract

The modulation transfer function of bar code scanning is a useful tool for evaluating the performance of the scanning laser beam. Understanding the behavior of the scanning laser system near the end of its depth of focus is of particular interest because it may lead to the development of techniques that could effective extend the depth of focus. In the article the MTF at focus and the two extremes of the depth of focus are presented. The presence of spherical aberration in the scanning laser beam generally reduces the depth of focus. The effects of the spherical aberration to the MTF is presented and discussed.

Paper Details

Date Published: 29 October 1998
PDF: 7 pages
Proc. SPIE 3429, Current Developments in Optical Design and Engineering VII, (29 October 1998); doi: 10.1117/12.328523
Show Author Affiliations
Hong Tang, NCR Corp. (United States)


Published in SPIE Proceedings Vol. 3429:
Current Developments in Optical Design and Engineering VII
Alson E. Hatheway; Robert E. Fischer; Malachy McConnell; Lawrence M. Germann; Lawrence M. Germann; Alson E. Hatheway; Malachy McConnell; Warren J. Smith, Editor(s)

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