Astronomy and Astrophysics – Astrophysics
Scientific paper
Jan 1990
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1990a%26a...227..640g&link_type=abstract
Astronomy and Astrophysics, Vol. 227, NO. 2/JAN(II), P. 640, 1990
Astronomy and Astrophysics
Astrophysics
3
Gamma Rays, Coded Masks, Image Processing
Scientific paper
In this paper we consider the possibility of using hexagonally uniformly redundant array (HURA) coded apertures for high energy gamma ray telescopes where discrete pixel detectors with low positional resolution are generally used. Results of laboratory tests carried out to study the performance of a coded aperture system using both a stationary and rotating HURA mask with a discrete pixel detector are presented and compared to computer simulations. The tests confirm the simulation results indicating that such a system, when the standard cross correlation deconvolution is applied, suffers from an intrinsic systematic noise due to the asymmetrical mismatch between the mask elements and the detector pixels. To reduce this coding error which is inherent to the system two techniques have been developed and tested. For a stationary mask, a special configuration using a hexagonal pixel detector has been identified for which mask elements are binned nearly exactly by the pixels and no coding error is present. An efficient and fast algorithm, based on mean count subtraction and weighted deconvolution, has also been developed in order to reduce the coding error when a proper design of the system is infeasible or when a rotating mask is used. Both of the above techniques have been proved to be effective, the second being more suitable for rotating masks for which the coding error is smoothed in the convolution stage by the mask rotation.
Byard Kevin
Dean Anthony J.
Goldwurm Andréa
Hall Jeffrey Clifton
Harding S. J. J.
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