Astronomy and Astrophysics – Astronomy
Scientific paper
Sep 1998
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1998aas...192.8107t&link_type=abstract
American Astronomical Society, 192nd AAS Meeting, #81.07; Bulletin of the American Astronomical Society, Vol. 30, p.1154
Astronomy and Astrophysics
Astronomy
Scientific paper
The Wide-Field Infrared Explorer (WIRE) is a small cryogenic spaceborne infrared telescope being readied for launch in September 1998 as the fifth of NASA's Small Explorers. WIRE illuminates two 128 x 128 Si:As Focal Plane Arrays (FPAs) produced by Boeing North American with a 30 cm diameter Ritchey Cretien diamond turned mirror system. A dichroic beam splitter and band-pass filter define two broad pass bands for a deep pointed survey to search for protogalaxies and to study the evolution of starburst galaxies. The Space Dynamics Laboratory at Utah State University (SDL/USU) developed and instrumented ground-based procedures to validate the focus of the WIRE Instrument. The procedures used point source data acquired during ground measurements obtained with a calibration source consisting of an illuminated pinhole near the focus of a cryogenically cooled collimator. Simulated point source measurements were obtained at multiple focus positions by translating the pinhole along the optical axis inside and outside the optimum focus of the collimator. The detector FPAs were moved to positions indicated by the test results. These focus positions were verified by subsequent cold tests using an independent cold collimator. The method and hardware used to obtain focus validation are described and results presented.
Hacking Paul
Larsen Mark
Shumway Andrew
Tansock Joseph J.
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