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Proceedings Paper

Long-term performance of the VISIR/VLT instrument before the upgrade
Author(s): Danuta Dobrzycka; Yazan Momany; Lars Lundin; Ralf Siebenmorgen; Hans U. Käufl; Alain Smette; Florian Kerber; Mario Van Den Ancker
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Paper 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.

Paper Details

Date Published: 13 September 2012
PDF: 7 pages
Proc. SPIE 8448, Observatory Operations: Strategies, Processes, and Systems IV, 84481P (13 September 2012);
Show Author Affiliations
Danuta Dobrzycka, European Southern Observatory (Germany)
Yazan Momany, European Southern Observatory (Chile)
Lars Lundin, European Southern Observatory (Germany)
Ralf Siebenmorgen, European Southern Observatory (Germany)
Hans U. Käufl, European Southern Observatory (Germany)
Alain Smette, European Southern Observatory (Chile)
Florian Kerber, European Southern Observatory (Germany)
Mario Van Den Ancker, European Southern Observatory (Germany)

Published in SPIE Proceedings Vol. 8448:
Observatory Operations: Strategies, Processes, and Systems IV
Alison B. Peck; Robert L. Seaman; Fernando Comeron, Editor(s)

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