Pseudo-noise product coded aperture arrays and method for designing same
First Claim
1. A coded aperture array comprising transparent and opaque elements, said coded aperture array being entirely interconnected and self-supporting, the elements of said coded aperture array being defined as being one of transparent and opaque in correspondence with an array pattern defined by the direct product of two pseudo-noise sequences, said direct product being defined by the relationship ##EQU10## where a1, a2, . . . , am =an mth order pseudo-noise sequence and b1, b2, . . . , bn =an nth order pseudo-noise sequence.
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Accused Products
Abstract
A self-supporting coded aperture array, and method for designing same, including transparent and opaque elements, the elements of the array being defined as one of transparent and opaque in correspondence with an array pattern defined by the direct product of two pseudo-noise sequences. The new arrays (called PNP arrays, for Pseudo-Noise Product) are of self-supporting geometry, simplifying fabrication and making them ideal candidates for situations where active apertures are employed, as for example, in high-energy γ-ray imaging. A unique and important feature of all PNP arrays is the ability to produce reconstructed images with uniform noise regardless of the original source structure.
39 Citations
13 Claims
- 1. A coded aperture array comprising transparent and opaque elements, said coded aperture array being entirely interconnected and self-supporting, the elements of said coded aperture array being defined as being one of transparent and opaque in correspondence with an array pattern defined by the direct product of two pseudo-noise sequences, said direct product being defined by the relationship ##EQU10## where a1, a2, . . . , am =an mth order pseudo-noise sequence and b1, b2, . . . , bn =an nth order pseudo-noise sequence.
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6. A method for designing a coded aperture array having transparent and opaque elements, comprising the steps of
selecting a first pseudo-noise sequence; -
selecting a second pseudo-noise sequence; multiplying said first pseudo-noise sequence by said second pseudo-noise sequence to define a direct product thereof, said direct product being defined by the relationship ##EQU11## where a1, a2, . . . , am =an mth order pseudo-noise sequence and b1, b2, . . . , bn =an nth order pseudo-noise sequence; and assigning each element in said coded aperture array to be one of transparent or opaque in correspondence with a value of said product of said first and second pseudo-noise sequences. - View Dependent Claims (7, 8, 9, 10, 11, 12, 13)
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Specification