13 September 2012 Long-term performance of the VISIR/VLT instrument before the upgrade
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Abstract
The ESO's VLT Spectrometer and Imager for the Mid-Infrared (VISIR) has been in operation at the Paranal Observatory since 2005. It is equipped with two DRS (formerly Boeing) 256 × 256 BIB arrays. The project to replace detectors into new Raytheon, 1k × 1k AQUARIUS devices as well as to modify observing modes, software, etc. is underway. The VISIR upgrade creates a well defined break point in the instruments' characteristics. For nearly 7 years of the VISIR operations we have been collecting and processing calibration data, in particular observations of the imaging and spectroscopic standard stars, within a regular data flow operation scheme. The derived quality control parameters have been systematically written into a database, which allows the analysis of their temporal behavior. We present an overview of the long term variations of the VISIR quality control parameters: sensitivity, conversion factor and mean background level estimations. The results will be later used to compare performance of VISIR before and after the upgrade.
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Danuta Dobrzycka, Danuta Dobrzycka, Yazan Momany, Yazan Momany, Lars Lundin, Lars Lundin, Ralf Siebenmorgen, Ralf Siebenmorgen, Hans U. Käufl, Hans U. Käufl, Alain Smette, Alain Smette, Florian Kerber, Florian Kerber, Mario Van Den Ancker, Mario Van Den Ancker, } "Long-term performance of the VISIR/VLT instrument before the upgrade", Proc. SPIE 8448, Observatory Operations: Strategies, Processes, and Systems IV, 84481P (13 September 2012); doi: 10.1117/12.925348; https://doi.org/10.1117/12.925348
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