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Title: Gain calibration of CCD systems at VBO
Authors: Prabhu, T. P
Mayya, Y. D
Anupama, G. C
Keywords: Astronomical observatories;Calibrating;Charge coupled devices;Astronomical photometry;Astronomical spectroscopy;Telescopes
Issue Date: Mar-1992
Publisher: Indian Academy of Sciences
Citation: Journal of Astrophysics and Astronomy, Vol. 13, No. 1, pp. 129 - 144
Abstract: The system gain of two CCD systems in regular use at the Vainu Bappu Observatory, Kavalur, is determined at a few gain settings. The procedure used for the determination of system gain and base-level noise is described in detail. The Photometrics CCD system at the 1-m reflector uses a Thomson-CSF TH 7882 CDA chip coated for increased ultraviolet sensitivity. The gain is program-selected through the parameter 'cgain' varying between 0 and 4095 in steps of 1. The inverse system gain for this system varies almost linearly from 27.7 electrons/DN at cgain = 0 to 1.5 electrons/DN at cgain = 500. The readout noise is less than or approximately equal to 11 electrons at cgain = 66. The Astromed CCD system at 2.3-m Vainu Bappu Telescope uses a GEC P8603 chip which is also coated for enhanced ultraviolet sensitivity. The amplifier gain is selected in discrete steps using switches in the controller. The inverse system gain is 4.15 electrons/DN at the gain setting of 9.2, and the readout noise of about 8 electrons.
ISSN: 0250-6335
Appears in Collections:IIAP Publications

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