Physical implementations of an antimask in URA based coded mask systems

Details Physical implementations of an antimask in URA based coded mask systems Physical implementations of an antimask in URA based coded mask systems

Sep 1991

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1991piau.rept.....j&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Gamma Ray Astronomy, Gamma Ray Telescopes, Image Enhancement, Photomasks, X Ray Astronomy, X Ray Imagery, X Ray Telescopes, Coding, Computerized Simulation, Image Processing, Imaging Techniques, X Ray Sources

Scientific paper

X and gamma ray astronomy experiments which employ rectangular URA coded masks alone show artifacts in the images reconstructed due to nonuniform background levels in the detector plane. The employment of a separate antimask in addition to the mask in observations is useful to eliminate this problem. We propose here a method to implement the antimask with the same mask, utilizing the antisymmetric properties in the mask pattern, thereby avoiding the need for a separate antimask in an experiment. Simulations performed with this mask-antimask system are presented to show its advantages.

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