Hardware results for the Wide-field Infrared Survey Explorer (WISE) telescope and scanner
2010
On December 14, 2009 NASA launched the Wide-field Infrared Survey Explorer (WISE), a NASA MIDEX mission
within the Explorers program that is currently performing an all-sky survey in four infrared bands. L-3 Integrated
Optical Systems/SSG designed, built, and tested the telescope, scanner, and aft imaging optical system for WISE under
contract to the Space Dynamics Laboratory. Hardware and test results for those subsystems are presented, as well as an
on-orbit status of their imaging performance. The WISE payload includes a 40 cm afocal telescope, a scan mirror for
back-scan during integration, and an aft optics imager assembly. All modules operate below 17 Kelvin. The allreflective
system uses aluminum mirrors and metering structures. The afocal telescope provides distortion control to
better than two parts in a thousand to prevent image blur during internal scanning. The one-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 five-mirror imaging optics module follows the scan
mirror and feeds dichroic beamsplitters that separate the energy into four channels between 2.8 and 26 microns. Once
initial on-orbit checkout and calibration was completed, WISE began a 6-month mission performing an all-sky survey in
the four infrared bands, which is over 80% complete as of June 2010.
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