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Proceedings Paper

Quality control of VLT ISAAC data
Author(s): Wolfgang Hummel; Christopher Lidman; Nicolas Devillard; Yves Jung; Rachael Johnson; Vanessa Doublier
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Paper Abstract

For 3 years the Infrared Spectrometer And Array Camera (ISAAC) has been operating at the 8m Antu (UT1) telescope of the European Southern Observatory Very Large Telescope (ESO VLT). As part of ESO data flow operations ISAAC data are processed and quality control checked by the Data Flow Operations group (often known as QC Garching). at ESO headquarters in Garching. The status of the instrument is checked in terms of QC parameters, which are derived from raw and processed data and compared against reference values. Low level parameters include detector temperature and zero level offset, other parameters include image quality and spectrum curvature. Complicated instrumental behaviors like the odd-even column effect and the appearance of pupil ghosts require more sophisticated QC tools. Instrumental interventions of cryogenic instruments like ISAAC include a defrost and re-freeze sequence which can be traced in trending plots of the QC1 parameters, which are published regularly (see We present recent highlights of the ISAAC QC process and their role as feedback to the observatory to retain the performance of the instrument.

Paper Details

Date Published: 2 January 2002
PDF: 11 pages
Proc. SPIE 4844, Observatory Operations to Optimize Scientific Return III, (2 January 2002); doi: 10.1117/12.460636
Show Author Affiliations
Wolfgang Hummel, European Southern Observatory (Germany)
Christopher Lidman, European Southern Observatory (Chile)
Nicolas Devillard, European Southern Observatory (Germany)
Yves Jung, European Southern Observatory (Germany)
Rachael Johnson, European Southern Observatory (Chile)
Vanessa Doublier, European Southern Observatory (Chile)

Published in SPIE Proceedings Vol. 4844:
Observatory Operations to Optimize Scientific Return III
Peter J. Quinn, Editor(s)

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