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Proceedings Paper

Preliminary design of a NIR prime focus corrector for the Galileo Telescope
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Paper Abstract

In this paper a preliminary design for a prime focus corrector to be mounted at the Telescopio Nazionale Galileo (TNG) is presented. The telescope is located on La Palma and has a primary mirror of 3.5 m with a hyperbolic sag. Two optical designs have been considered in order to exploit detectors with 1k by 1k and 2k by 2k pixels. Each design makes use of four lenses, tow of which are aspherical. The first lens diameters are respectively, of 140 mm and 320 mm for the two kinds of detectors. For both designs the telescope pupil is deliberately not re-imaged, and therefore it will not be possible to insert a cold stop. For such a reason particular care has been dedicated to the telescope thermal background study, in order to optimize the baffling system. The optics is able to correct fields of 11 feet by 11 feet and of 60 feet by 60 feet, depending on the design. It should be considered that the particular geometry of the focal plane array mosaic does not permit a full exploitation of the entire field, being based on a combination of four detectors. The selected chips are HgCdTe manufactured by Rockwell, i.e. Hawaii I in the 1k by 1k case and Hawaii I in the 1k by 1k case and Hawaii II in the 2k by 2k case.

Paper Details

Date Published: 16 August 2000
PDF: 7 pages
Proc. SPIE 4008, Optical and IR Telescope Instrumentation and Detectors, (16 August 2000); doi: 10.1117/12.395410
Show Author Affiliations
Claudio Pernechele, Osservatorio Astronomico di Padova (Italy)
Fabio Bortoletto, Osservatorio Astronomico di Padova and Ctr. Galileo Galilei (Italy)
Paolo Conconi, Osservatorio Astronomico di Milano (Italy)
Daniele Gardiol, Ctr. Galileo Galilei (Italy)
Emilio Molinari, Osservatorio Astronomico di Milano (Italy)
Filippo Maria Zerbi, Osservatorio Astronomico di Milano (Italy)

Published in SPIE Proceedings Vol. 4008:
Optical and IR Telescope Instrumentation and Detectors
Masanori Iye; Alan F. M. Moorwood, Editor(s)

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