Computer Science – Performance
Scientific paper
Nov 1989
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1989spie.1159...67f&link_type=abstract
IN: EUV, X-ray, and gamma-ray instrumentation for astronomy and atomic physics; Proceedings of the Meeting, San Diego, CA, Aug.
Computer Science
Performance
Collimators, Imaging Spectrometers, Radiation Detectors, Terrestrial Radiation, Gamma Ray Spectra, Germanium, Image Reconstruction, Imaging Techniques, Performance Tests, X Ray Sources
Scientific paper
The WINKLER spectrometer is a matrix of nine high-purity, n-type germanium detectors developed for astrophysical observations and terrestrial radiation monitoring. The spectrometer has been fitted with a set of modulation collimator grids designed for imaging hard X-ray and gamma-ray sources by the method of Mertz, Nakano, and Kilner. This technique employs a pair of gridded collimators in front of each detector with the number of grid bars varying from one to N, where N is the number of detectors. When the collimator pairs are rotated through a full 360 degree angular range, the detector signals provide the information for a two-dimensional band-limited Fourier reconstruction of order N. Tests of the spectrometer with single and multiple point sources as well as continuous source distributions are reported. The spectrometer field-of-view is 20 deg, and the observed FWHM of the point spread function is 1.6 deg, in good agreement with simulation results. Images have been obtained for gamma-ray energies from 60 keV to 1.3 MeV, although transmission through the grids reduces contrast at the higher energies.
Fisher Robert Taylor
Hamilton William J.
Hawley J. D.
Kilner J. R.
Murphy M. R.
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