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Diffuse Infrared Background Experiment
Diffuse Infrared Background Experiment (DIRBE)〔 was an experiment on NASA's COBE mission,〔 to survey the diffuse infrared sky. Measurements were made with a reflecting telescope with 19 cm diameter aperture.〔(Riccardo Giacconi, Daniela Calzetti, Mario Livio, Piero Madau, Space Telescope Science Institute (U.S.) - Extragalactic background radiation: a meeting in honor of Riccardo Giacconi : proceedings of the Extragalactic Background Radiation Meeting, Baltimore, 1993 May 18-20, Volume 1993 - Page 137 (Google Books accessed October 2010) )〕 The goal was to obtain brightness maps of the universe at ten frequency bands ranging from the near to far infrared (1.25 to 240 micrometer).〔 Also, linear polarization was measured at 1.25, 2.2, and 3.5 micrometers.〔 During the mission, the instrument could sample half the celestial sphere each day.〔
==Mission details==
The Cosmic Background Explorer (COBE) mission was launched in November 1989. The spacecraft contained liquid helium that cooled the DIRBE instrument to below 2K to allow it to image in the infrared wavelengths. Primary observation started December 11, 1989 and ran until September 21, 1990, when the liquid helium ran out. After that date only observations in the 1.25 to 4.9 micrometer bands could be carried out, at about 20% of original sensitivity.〔(【引用サイトリンク】url=http://ned.ipac.caltech.edu/level5/Hauser/Hauser4.html )〕
The DIRBE instrument was an absolute radiometer with an off-axis folded-Gregorian reflecting telescope, with 19 cm diameter aperture.〔
抄文引用元・出典: フリー百科事典『 ウィキペディア（Wikipedia）』
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