Astronomy and Astrophysics – Astrophysics
Scientific paper
Oct 1988
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1988a%26a...205..361v&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 205, no. 1-2, Oct. 1988, p. 361-366. ESA-supported research.
Astronomy and Astrophysics
Astrophysics
Astronomical Photography, Calibrating, European Space Agency, Image Processing, Photometers, Data Reduction, Reference Stars, Television Equipment, Transfer Functions
Scientific paper
The analysis of flat fields and standard star observations with the ESA Photon Counting Detector revealed complex non-linear behaviour of the Intensity Transfer Function due to persistence effects traceable to the target of the TV tube to the phosphors of the image intensifier. Position-dependent illumination of the TV target resulted in an apparent efficiency dependence. As a direct consequence of this non-linearity the flux calibration by means of standard stars is uncertain by roughly 50%. The total efficiency of the detector is between 1 and 4 percent due to the low gain of the intensifier. The reduction procedure adopted for PCD direct imaging is discussed. Based on the experience with the PCD some recommendations are given for photon counters in general.
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