Cryogenic Telescope, Scanner, and Imaging Optics for the Wide-field Imaging Survey Explorer (WISE)

Details Cryogenic Telescope, Scanner, and Imaging Optics for the Wide-field Imaging Survey Explorer (WISE) Cryogenic Telescope, Scanner, and Imaging Optics for the Wide-field Imaging Survey Explorer (WISE)

Dec 2006

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2006aas...20916403s&link_type=abstract

2007 AAS/AAPT Joint Meeting, American Astronomical Society Meeting 209, #164.03; Bulletin of the American Astronomical Society,

Physics

Optics

Scientific paper

NASA's Wide-field Infrared Survey Explorer (WISE) instrument includes a cryogenic telescope, scanner, and imaging optics module. Component fabrication, mirror polishing, and prototype scanner cryogenic testing are complete for these subassemblies, and assembly is in process. The telescope is a 40 cm aperture reflecting five-mirror imager/collimator relay that provides 8X demagnification, a 47 x 86 arcminute field of regard, and a real exit pupil for scanning. It also provides distortion control to better than one part in a thousand to prevent image blur during internal scanning. A single-axis scan mirror at the exit pupil scans the detectors' field of view across the telescope field of regard, countering the orbital motion and freezing the line of sight during the multi-second exposure period. The imaging optics module is a five-mirror re-imager with dichroic beamsplitters that separate the energy into four infrared channels between 2.8 and 26 microns. All modules operate below 17 Kelvin. The all-reflective system uses aluminum mirrors and metering structures. L-3 Communications SSG-Tinsley is designing and building the telescope, scanner, and imaging optics module under contract to the Space Dynamics Laboratory. WISE is a MIDEX mission within NASA's Explorers Program.

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