Browse Prior Art Database

Coded Aperture

IP.com Disclosure Number: IPCOM000046533D
Original Publication Date: 1983-Aug-01
Included in the Prior Art Database: 2005-Feb-07
Document File: 2 page(s) / 39K

Publishing Venue

IBM

Related People

Gourlay, AR: AUTHOR

Abstract

In a recent article [*] an L-shaped coded aperture A was discussed and shown to possess a decoding array G for which the balanced correlation A*G is a true delta function. The present article provides a considerable generalization of that structure which permits greater flexibility in its design and openness, while still preserving its ease of construction. This aperture and its associated decoding array are shown in Figs. 1 and 2, respectively. The dimension of the aperture is n, and s is a factor of n which determines the inner frequency of the additional bars of openness. Therefore, this structure is referred to as an (n, s ) coded aperture based on the original L-shape. The decoding array is defined by this shape and by the values of the parameters a, b, whose positions are shown in Fig. 2.

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Coded Aperture

In a recent article [*] an L-shaped coded aperture A was discussed and shown to possess a decoding array G for which the balanced correlation A*G is a true delta function. The present article provides a considerable generalization of that structure which permits greater flexibility in its design and openness, while still preserving its ease of construction. This aperture and its associated decoding array are shown in Figs. 1 and 2, respectively. The dimension of the aperture is n, and s is a factor of n which determines the inner frequency of the additional bars of openness. Therefore, this structure is referred to as an (n, s ) coded aperture based on the original L-shape. The decoding array is defined by this shape and by the values of the parameters a, b, whose positions are shown in Fig. 2. For the general (n, s ) aperture (1< s< n) these parameters have the values Further, the aperture has a density of holes and thus has an openness of <50% when Reference A. R. Gourlay, "Coded Aperture for Tomographic Imaging," IBM Technical Disclosure Bulletin 24, 2848-2849 (November 1981).

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