Some applications of one-dimensional coded apertures

R. G. Simpson, Harrison H Barrett, J. G. Kelly, K. T. Stalker

Research output: Contribution to journalArticle

1 Scopus citations

Abstract

The 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.

Original languageEnglish (US)
Pages (from-to)71-78
Number of pages8
JournalProceedings of SPIE - The International Society for Optical Engineering
Volume106
DOIs
StatePublished - Aug 29 1977

ASJC Scopus subject areas

  • Applied Mathematics
  • Electronic, Optical and Magnetic Materials
  • Condensed Matter Physics
  • Electrical and Electronic Engineering
  • Computer Science Applications

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