DocumentCode :
1096900
Title :
Techniques for removing nonuniform background in coded-aperture imaging on the energetic X-ray imaging telescope experiment
Author :
Covault, C.E. ; Grindlay, J.E. ; Manandhar, R.P. ; Braga, J.
Author_Institution :
Harvard-Smithsonian Center for Astrophys., Cambridge, MA, USA
Volume :
38
Issue :
2
fYear :
1991
fDate :
4/1/1991 12:00:00 AM
Firstpage :
591
Lastpage :
596
Abstract :
It is found that the subtractive flat field technique for nonuniform background illumination is generally effective at removing background systematics for stationary mask experiments such as the energetic X-ray imaging experiment. The time dependence of intensity and the two-dimensional shape of the background detector image during the flight are explored. A flat field image is constructed from observations where X-ray sources were absent from the field of view. It is shown that this technique can successfully reduce RMS fluctuations to within a few percent of ideal Poisson statistics. The quality of the flat field does not appear to be a strong function of radius and can be used effectively out to the edge of the detector to remove the strong background ring
Keywords :
X-ray astronomy; astronomical telescopes; Poisson statistics; RMS fluctuations; astronomy; background detector image; coded-aperture imaging; energetic X-ray imaging telescope experiment; intensity; nonuniform background illumination; stationary mask experiments; strong background ring; subtractive flat field technique; time dependence; two-dimensional shape; Apertures; Background noise; Calibration; Image reconstruction; Lighting; NASA; Optical imaging; Position sensitive particle detectors; Telescopes; X-ray imaging;
fLanguage :
English
Journal_Title :
Nuclear Science, IEEE Transactions on
Publisher :
ieee
ISSN :
0018-9499
Type :
jour
DOI :
10.1109/23.289362
Filename :
289362
Link To Document :
بازگشت