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Proceedings Paper

VISIR: a mid-infrared imager and spectrometer for the VLT
Author(s): Yvon Rio; Pierre-Olivier Lagage; Didier Dubreuil; Thierry Tourrette; Gerard Dhenain; Philippe Galdemard; Franck Quatrehomme; Philippe Lavocat; Jean de Trogoff; Mattheus WM de Graauw; Jan J. Wijnbergen; Jan-Willem Pel; Anton Schoenmaker
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Paper Abstract

In 1992, the European Southern Observatory (ESO) committed a phase A study of a mid- infrared instrument for the 2nd unit VLT telescope, to a consortium of laboratories (SAp at Saclay, France; SRON at Groningen, Germany; and the Kapteyn Observatory at Roden, Netherlands). The results of the study are presented. One key scientific objective for this instrument is foreseen to be the study of dust. The required observing modes are (1) diffraction limited imaging both at 10 and 20 microns, and (2) spectroscopy at low resolution (R approximately equals 500) both at 10 and 20 microns. Another key domain is the study of atomic, molecular, and ionic lines observable in the atmospheric window at 10 and 20 microns. Given the various environments where the lines originate, medium (approximately equals 5000) to high (approximately equals 30,000) spectral resolution is needed. The optical design, as well as a mechanical layout, incorporating the various modes is described. The imaging and spectroscopic channels are separated. The spectrometer is based on a long slit all reflective design. Two optical configurations have been studied in detail. Because of the need for variable magnifications, the imager is based on refractive optics.

Paper Details

Date Published: 6 June 1995
PDF: 10 pages
Proc. SPIE 2475, Infrared Detectors and Instrumentation for Astronomy, (6 June 1995); doi: 10.1117/12.211267
Show Author Affiliations
Yvon Rio, Commissariat a l'Energie Atomique/Service d'Astrophysique (France)
Pierre-Olivier Lagage, Commissariat a l'Energie Atomique/Service d'Astrophysique (France)
Didier Dubreuil, Commissariat a l'Energie Atomique/Service d'Astrophysique (France)
Thierry Tourrette, Commissariat a l'Energie Atomique/Service d'Astrophysique (France)
Gerard Dhenain, Commissariat a l'Energie Atomique/Service d'Astrophysique (France)
Philippe Galdemard, Commissariat a l'Energie Atomique/Service d'Astrophysique (France)
Franck Quatrehomme, Commissariat a l'Energie Atomique/Service d'Astrophysique (France)
Philippe Lavocat, Commissariat a l'Energie Atomique/Service d'Astrophysique (France)
Jean de Trogoff, Commissariat a l'Energie Atomique/Service des detecteurs (France)
Mattheus WM de Graauw, SRON (Netherlands)
Jan J. Wijnbergen, SRON (Netherlands)
Jan-Willem Pel, Kapteyn Observatory (Netherlands)
Anton Schoenmaker, Kapteyn Observatory (Netherlands)


Published in SPIE Proceedings Vol. 2475:
Infrared Detectors and Instrumentation for Astronomy
Albert M. Fowler, Editor(s)

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