Coded aperture imaging with self-supporting uniformly redundant arrays

• US 4,389,633 A
• Filed: 09/26/1980
• Issued: 06/21/1983
• Est. Priority Date: 09/26/1980
• Status: Expired due to Term

• Current Assignee: United States Department Of Health And Human Services
• Original Assignee: United States Department of Energy
• Inventors: Fenimore, Edward E.
• Primary Examiner(s): Boudreau, Leo H.
• Application Number:
  US06/191,192
• Time in Patent Office: 998 Days
• Field of Search: 250/272-274, 250/320, 250/363 R, 250/363 S, 250/390-392, 250/445 R, 250/445 T, 350/162 SF, 350/162 ZP, 350/169, 350/319, 364/414, 364/515, 364/728, 364/819, 340/146.3 F, 340/146.3 Q, 340/146.3 MA, 340/146.3 P
• US Class Current: 382/204
• CPC Class Codes: G01T 1/295 using coded aperture devices, e.g. Fresnel zone plates handling of radiation of particles, e.g. using diaphragms, collimators, diffraction G21K1/00
• CPC Class Codes: G03H 1/06 using incoherent light

Abstract

A self-supporting uniformly redundant array pattern for coded aperture imaging. The present invention utilizes holes which are an integer times smaller in each direction than holes in conventional URA patterns. A balance correlation function is generated where holes are represented by 1'"'"'s, nonholes are represented by -1'"'"'s, and supporting area is represented by 0'"'"'s. The self-supporting array can be used for low energy applications where substrates would greatly reduce throughput. The balance correlation response function for the self-supporting array pattern provides an accurate representation of the source of nonfocusable radiation.

Claims

1. A self-supporting uniformly redundant array aperture imaging device for imaging a source of nonfocusable radiation comprising:

a self-supporting uniformly redundant array aperture having holes which are of a size equal to c/n where c is the spacing between possible hole locations and n is an integer, said holes of said self-supporting uniformly redundant array formed at corresponding positions within hole locations of said uniformly redundant array;

means for detecting said nonfocusable radiation imaged by said uniformly redundant array;

means for balance correlating information from said means for detecting to generate a decoded image of said source of said nonfocusable radiation, said means for balance correlating information from said means for detecting comprising a balance correlation function wherein holes are represented by 1, nonholes are represented by -1, and supporting area is represented by 0.

2. A self-supporting uniformly redundant array aperture imaging device for imaging low energy nonfocusable radiation comprising:

a self-supporting uniformly redundant array aperture aligned to aperture image said nonfocusable radiation, said self-supporting uniformly redundant array comprising an aperture having holes of size c/n placed at (u, v) such that u=c·

i, v=c·

j, where the basic array has dimensions r by s, r and s are prime numbers, r-s=2, A(mod_r i, mod_s j)=1, 0≦

i≦

2r, 0≦

j≦

2s, n is an integer and c is the spacing between possible hole locations;

means for detecting said nonfocusable radiation imaged by said uniformly redundant array; and

,

means for balance correlating information from said means for detecting to generate a decoded image of said source of said nonfocusable radiation, said means for balance correlating information from said means for detecting comprising a function G(I,J) wherein;

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