Astronomy and Astrophysics – Astrophysics
Scientific paper
Dec 1987
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1987phdt........47l&link_type=abstract
Ph.D. Thesis Columbia Univ., New York, NY.
Astronomy and Astrophysics
Astrophysics
Broadband, Gas Analysis, Imagery, Proportional Counters, Scintillation Counters, Apertures, Coding, Cosmic X Rays, Focal Plane Devices, Grazing Incidence, Masks, Spatial Resolution
Scientific paper
A large imaging gas scintillation proportional counter (LIGSPC) has been built and calibrated at the Columbia Astrophysics Laboratory. This instrument combines the good energy resolution of a gas scintillation proportional counter with the good spatial resolution of a multiwire proportional counter. We present experimental results obtained with this detector and interpret them in terms of the physical processes underlying its operation. A coded aperture mask whose pattern is based on a pseudorandom sequence has been tested with the LIGSPC. We discuss the effects that several physical design limitations have on the image deconvolution and compare analytical, simulated, and experimental results. Placed at the focal plane of a grazing incidence mirror and a coded aperture mask, the LIGSPC forms the basis of a broad band X-ray imaging spectrophotometer (BBXRIS) for the study of cosmic X-ray sources. We discuss the principles involved in the design of an experiment based on the BBXRIS concept and look at two specific examples, preparations for which are now underway.
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