Optical design and tolerances of wide-field imagers for astronomical survey

Details Optical design and tolerances of wide-field imagers for astronomical survey Optical design and tolerances of wide-field imagers for astronomical survey

Nov 2003

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2003spie.5173...87t&link_type=abstract

Current Developments in Lens Design and Optical Engineering IV. Edited by Mouroulis, Pantazis Z.; Smith, Warren J.; Johnson, R.

Computer Science

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Scientific paper

We present three designs and tolerances of wide-field imagers (30´30 arc-minutes or larger) for astronomical surveying. Two infrared cameras (CPAPIR and PANORAMIX II) were designed for the 0.8-2.4 μm band and a third one (WIRCAM) for the visible and near-infrared band extending from 410 nm to 950 nm. The cameras are installed on the telescopes of the Canada-France-Hawaii (Hawaii, USA) and Mont Mégantic Observatories (Québec, Canada). The three cameras are compact, use only spherical refractive components and have an internal pupil accessible for insertion of filtering components. A Lyot stop must be used in the infrared camera for background rejection. For PANORAMIX II, a set of filters is used at the internal pupil. Correction of the large off-axis aberrations generated by the telescopes, wide spectral coverage, material choices, cryogenic temperature and alignment were the main design challenges. Also, tolerancing was particularly critical for the infrared cameras because they are cryogenically cooled, thus forbidding adjustment of internal components. The cameras" theoretical performances are presented in terms of point-spread function, encircled energy and distortion.

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