Coded masks with two spatial scales

Details Coded masks with two spatial scales Coded masks with two spatial scales

Sep 1993

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1993a%26a...276..673s&link_type=abstract

Astronomy and Astrophysics, Vol. 276, p. 673 (1993)

Astronomy and Astrophysics

Astrophysics

12

Instrumentation: Detectors - Telescopes Gamma-Rays: Observations - X-Rays: General

Scientific paper

A new design is proposed for masks for wide-band coded aperture X-ray/gamma-ray telescopes. The masks contain both elements with a coarse spatial scale, which are opaque at all energies at which the telescope is to operate, and elements with finer structure which provide good angular resolution at low energies but which become transparent in the upper part of the energy range. It is shown that patterns exist which have very satisfactory imaging properties and that the sensitivity which is sacrificed to obtain the improvement in angular resolution is very small, even at intermediate energies where the fine mask is partially absorbing.

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