Some Applications Of One-Dimensional Coded Apertures

R. G. Simpson; H. H. Barrett; J. G. Kelly; K. T. Stalker

doi:10.1117/12.955458

29 August 1977 Some Applications Of One-Dimensional Coded Apertures

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

Proceedings Volume 0106, X-Ray Imaging; (1977) https://doi.org/10.1117/12.955458
Event: 1977 SPIE/SPSE Technical Symposium East, 1977, Reston, United States

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.

Citation Download Citation

R. G. Simpson, H. H. Barrett, J. G. Kelly, and K. T. Stalker "Some Applications Of One-Dimensional Coded Apertures", Proc. SPIE 0106, X-Ray Imaging, (29 August 1977); https://doi.org/10.1117/12.955458

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