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29 October 1998 Effects of spherical aberration on the laser beam of a bar code scanner
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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.
© (1998) COPYRIGHT Society of Photo-Optical Instrumentation Engineers (SPIE). Downloading of the abstract is permitted for personal use only.
Hong Tang "Effects of spherical aberration on the laser beam of a bar code scanner", Proc. SPIE 3429, Current Developments in Optical Design and Engineering VII, (29 October 1998);


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