Study of a coded mask telescope for astronomical measurements in the hard X-ray domain

Details Study of a coded mask telescope for astronomical measurements in the hard X-ray domain Study of a coded mask telescope for astronomical measurements in the hard X-ray domain

May 1984

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1984stin...8510889h&link_type=abstract

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Astronomy and Astrophysics

Astronomy

Balloon-Borne Instruments, Coding, Collimators, Telescopes, X Ray Astronomy, Angular Resolution, Cameras, Computerized Simulation, Data Correlation, Image Processing, Product Development, Spatial Resolution

Scientific paper

A coded mask telescope was investigated for balloon flights, and sensitivity studies of a rotation-modulation collimator system were carried out. An Anger camera with a spatial resolution of 8 to 10 mm was built for the telescope. The mask coding theory and mask construction are described. A correlation method is used for image evaluation. The effects of detector characteristics on the correlation image are determined. The efficiency of the correlation method is found to depend on the detector spatial resolution. Measurements on a laboratory model show a measuring accuracy of 0.1 deg and a correlation efficiency conforming to values found by simulations. The efficiency decreases with source energy as expected. Simulation shows that the collimator-induced shift in source position at the boundary of the image can be corrected. The coded mask telescope does not require a precise alignment of the telescope axis, and is four times more sensitive than the rotation-modulation collimator. The telescope is very well suited for measurements on weak X-ray sources.

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