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Proceedings Paper

Scintillation imaging: a technique to reduce coding noise in scanned coded aperture imagers
Author(s): Klaus P. Ziock
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Paper Abstract

Coded aperture imagers provide the optimum means to generate an all-sky survey at gamma-ray energies from 10's of keV to a few MeV. Unfortunately, such imagers are plagued by systematic noise that limits their dynamic range. In par-ticular, spatial gradients in the background radiation across the detector and imperfectly coded signals from strong point sources in the field of view add artifacts to the images. Although theoretical signal-to-noise ratios of order 104 are possi-ble in perfectly coded images, real-world effects have limited performance of past imagers to significantly less than that. One technique to help remove these aberrations is the use of sequential exposures with a mask and it's inverse. However, for large instruments this is an impractical solution. In addition, it does not apply for scenes with rapidly varying sources. In a scanning instrument, one solution to this problem is to interleave the mask and anti-mask patterns in a sin-gle aperture in the direction of scan. A true source will oscillate between positive and negative images (i.e. scintillate) while spatially varying backgrounds are significantly suppressed.

Paper Details

Date Published: 21 October 2004
PDF: 10 pages
Proc. SPIE 5540, Hard X-Ray and Gamma-Ray Detector Physics VI, (21 October 2004); doi: 10.1117/12.580609
Show Author Affiliations
Klaus P. Ziock, Lawrence Livermore National Lab. (United States)

Published in SPIE Proceedings Vol. 5540:
Hard X-Ray and Gamma-Ray Detector Physics VI
Arnold Burger; Ralph B. James; Larry A. Franks, Editor(s)

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