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Proceedings Paper

Some Applications Of One-Dimensional Coded Apertures
Author(s): R. G. Simpson; H. H. Barrett; J. G. Kelly; K. T. Stalker
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Paper Abstract

One-dimensional coded apertures have been investigated for use in imaging long, narrow objects such as reactor fuel pins. Since coded apertures work better for small, point-like objects, while pinhole apertures work better for large extended objects, a hybrid aperture combining these properties seems attractive for imaging fuel pins. The one-dimensional aperture behaves like a coded aperture in the direction for which the object is small, while it acts like a pinhole in the direction for which the object is extended. A one-dimensional Fresnel zone plate has been investigated, and an iterative, nonlinear algorithm has been developed for removing the background produced by extra-core values in the point spread function. The algorithm is shown to have a decidedly nonlinear effect on the effective system transfer function. Uniformly redundant sequences have also been investigated as possible aperture codes. They can produce filled apertures and result in a decoded image with a uniform background level that can be easily removed by subtraction.

Paper Details

Date Published: 29 August 1977
PDF: 8 pages
Proc. SPIE 0106, X-Ray Imaging, (29 August 1977); doi: 10.1117/12.955458
Show Author Affiliations
R. G. Simpson, University of Arizona (United States)
H. H. Barrett, University of Arizona (United States)
J. G. Kelly, Sandia Laboratories (United States)
K. T. Stalker, Sandia Laboratories (United States)

Published in SPIE Proceedings Vol. 0106:
X-Ray Imaging
Richard P. Chase; Glenn W. Kuswa, Editor(s)

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