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Proceedings Paper

Extending the focal depth of an optical tracking system using a phase pupil plate
Author(s): Xinping Liu; Xianyang Cai; Chander P. Grover
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Paper Abstract

In this paper we present a normalized method of deriving a phase pupil function to extend the focal depth of imaging systems specially used for small object tracking. The method is based on the concept that the intensity distribution in the vicinity of the focal plane can be controlled and redistributed by means of a phase pupil function. This phase pupil function allows the peak intensity of a point-spread function (PSF) of the imaging system to remain relatively uniform, and the profile of the PSF to be approximately fitted to a Gaussian function in an extended range of the focal depth. A rotational symmetric aspheric phase plate has been designed and fabricated. The imaging system incorporating this pupil plate has extended the focal depth more than twofold compared with a conventional imaging system. Theoretical analyses and experimental results are also presented in support of this method.

Paper Details

Date Published: 6 November 2003
PDF: 9 pages
Proc. SPIE 5174, Novel Optical Systems Design and Optimization VI, (6 November 2003); doi: 10.1117/12.503877
Show Author Affiliations
Xinping Liu, National Research Council (Canada)
Xianyang Cai, National Research Council (Canada)
Chander P. Grover, National Research Council (Canada)

Published in SPIE Proceedings Vol. 5174:
Novel Optical Systems Design and Optimization VI
Jose M. Sasian; R. John Koshel; Paul K. Manhart, Editor(s)

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