Accession Number : ADD017762

Title :   Fourier Transform Microscope for X-Ray and/or Gamma-Ray Imaging.

Descriptive Note : Patent, Filed 15 Mar 93, patented 11 Jul 95,

Corporate Author : DEPARTMENT OF THE NAVY WASHINGTON DC

Personal Author(s) : Wood, Kent S ; Feldman, Uri

Report Date : 11 Jul 1995

Pagination or Media Count : 17

Abstract : A Fourier transform microscope for use in imaging a source of x ray and/or gamma ray radiation includes first and second grids arranged in proximity to the source. The first grid includes an arrangement of first subgrids elements with a first predetermined number n of approximately parallel, equally spaced linear first ribs which are opaque to the radiation of interest, and first radiation transparent regions which are arranged in alternation with the first ribs. The second grid includes an arrangement of second subgrids elements which are larger than the first subgrids elements, and which have a common field of view with corresponding first sub-grid elements. Each second subgrid element has a second predetermined number n+m of approximately parallel, equally spaced linear second ribs which are opaque to the radiation of interest, and second radiation transparent regions which alternate with the second ribs. Each first subgrid element and its corresponding second subgrid element is termed a subgrid system. Each subgrid system can be used to derive an amplitude and phase of an associated Fourier component. A position sensitive detector detects a Moire' or fringe pattern from which subgrid system and generates a signal indicative of the radiation intensity distribution image of the source in spatial frequency domain which can be converted into a radiation intensity distribution image of the source in spatial domain using a Fourier transform.

Descriptors :   *FOURIER TRANSFORMATION, *IMAGE PROCESSING, *PATENTS, SPATIAL DISTRIBUTION, DETECTORS, INTENSITY, TRANSPARENCE, SENSITIVITY, X RAYS, GAMMA RAYS, PATTERNS, MICROSCOPES, FREQUENCY DOMAIN, FOURIER ANALYSIS, OPACITY

Subject Categories : Recording and Playback Devices

Distribution Statement : APPROVED FOR PUBLIC RELEASE