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28 July 2008Innovative pupil topographies for sparse aperture telescopes and SNR
Since the first application of the telescope to astronomy in 1610, most new astronomical discoveries require larger and
larger radiation collecting areas. Today, the twin 10-meter Keck telescopes are operational and several 30-meter-aperture
class telescopes are being planned. Optical interferometers and sparse aperture ground telescopes for astronomy have
been proposed and built. Fienup showed the dependence between exposure time and the dilution factor of the aperture
needed to maintain image quality.1 Carpenter suggests a sparse aperture telescope system for the purpose of imaging
across the surfaces of stars.2 This paper demonstrates that the ability to reconstruct images from white-light extended
sources with different contrast levels also depends on the specific pupil topography that is applied to the telescope
system. Signal-to-noise ratios for recorded images are calculated for scene contrast, pupil shape, detector full-well,
detected photons, and exposure times.
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James Breckinridge, Nevin Bryant, John Lorre, "Innovative pupil topographies for sparse aperture telescopes and SNR," Proc. SPIE 7013, Optical and Infrared Interferometry, 70133E (28 July 2008); https://doi.org/10.1117/12.787011