Computer Science – Graphics
Scientific paper
Mar 1992
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992pasp..104..204p&link_type=abstract
Astronomical Society of the Pacific, Publications (ISSN 0004-6280), vol. 104, March 1992, p. 204-214. Research supported by Astr
Computer Science
Graphics
67
Cameras, Infrared Photography, Near Infrared Radiation, Astronomical Photometry, Data Acquisition, Infrared Spectrophotometers, Signal To Noise Ratios
Scientific paper
The optical, mechanical, and electronic designs of a multipurpose near-infrared (1.1-2.5-micron) camera built for Las Campanas Observatory are described. The camera is used on both a 2.5-m and a 1-m telescopes. A refractive all-spherical achromatic reimager incorporates three confocal discrete zooms which image onto an HgCdTe (NICMOS2) 128 x 128 detector array. Although the instrument was designed primarily for imaging, two experimental modes were included for future use: a low-resolution grism (R about 400) and a coronagraph. The optical design choices and procedures are described in some detail. The entire 0.6-m optical path resides at 77 K and is folded onto a 25.4 cm diameter dewar work surface. The instrument is remotely controlled by a sun 386i graphics workstation via serial links to microprocessor-controlled motor-encoder packages and the array control electronics. Electronic designs suitable for use with a NICMOS2 array are given. The data are acquired and inspected using IRAF routines running under the UNIX multitasking environment. Initial performance results on camera optical quality and system sensitivity are given.
Carr D. M.
Murphy David C.
Persson Eric S.
Sivaramakrishnan Anand
West Steven C.
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