Astronomy and Astrophysics – Astrophysics
Scientific paper
Apr 1994
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1994a%26a...284..340t&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 284, no. 1, p. 340-348
Astronomy and Astrophysics
Astrophysics
23
Angular Resolution, Charge Coupled Devices, Distortion, Imagery, Photons, Speckle Interferometry, Astronomical Models, Fourier Transformation
Scientific paper
This paper deals with solutions to overcome or to correct for the defects of photon-counting detector-intensified CCD (ICCD) in particular - for the purpose of speckle interferometry. Among others, we show how to cope with strong image distortion in the photon-counting case and with the so-called photon-counting hole. The latter is due to the incapacity to detect any pair of close photon-events in the short exposure images. Our photon-counting detector, the CP40 camera (Blazit 1987; Foy 1988a), consists in an ICCD and centroiding electronics. Nevertheless, other photon-counting detectors present a defect similar to the photon-counting hole due to the limited shortest time delay between two consecutive photon-events. A model for the photon-counting hole is proposed which allows to predict its effect on the mean autocorrelation of short-exposure images. Compensation for this defect is obtained using Fourier transform of mean symmetrised cross-correlation instead of autocorrelation for the estimate of the power spectrum.
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