Mosaic of coded aperture arrays
AssigneeThe United States Government as represented by the United States Department of Energy
InventorsEdward E. Fenimore, Thomas M. Cannon
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Abstract
The present invention pertains to a mosaic of coded aperture arrays which is capable of imaging off-axis sources with minimum detector size. Mosaics of the basic array pattern create a circular on periodic correlation of the object on a section of the picture plane. This section consists of elements of the central basic pattern as well as elements from neighboring patterns and is a cyclic version of the basic pattern. Since all object points contribute a complete cyclic version of the basic pattern, a section of the picture, which is the size of the basic aperture pattern, contains all the information necessary to image the object with no artifacts.
Claims4
An imaging arrangement for a coded aperture imaging system comprising:
- a source of nonfocusable radiation;
- a position sensitive detector;
- mosaic array aperture means formed from a basic r by s array and neighboring cyclic versions of said basic r by s array adjacent to said basic r by s array, said mosaic array aperture means substantially aligned with said source of nonfocusable radiation and said position sensitive detector to form an encoded aperture image;
- said encoded aperture image formed by a circular correlation of said mosaic aperture array and said source of nonfocusable radiation such that all object source points of said source of nonfocusable radiation contribute a complete cyclic version of said basic r by s array within a minimal detector area for sources aligned off axis;
- means for reconstructing an image of said source from said encoded aperture image.
Dependencies are inferred from the claim text.