Singal 2009 射电背景辐射探测器ARCADE 2
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相当于有了一个新的窗口. 3-90GHz
(不过不知道和地面的射电望远镜比, 有什么优势. 是地面的精于点状辐射体, 只能探测比地面背景等背景高的辐射吗?)
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文章信息:
The ARCADE 2 Instrument
(Submitted on 5 Jan 2009)
Abstract: The second generation Absolute Radiometer for Cosmology, Astrophysics, and Diffuse Emission (ARCADE 2) instrument is a balloon-borne experiment to measure the radiometric temperature of the cosmic microwave background and Galactic and extra-Galactic emission at six frequencies from 3 to 90 GHz. ARCADE 2 utilizes a double-nulled design where emission from the sky is compared to that from an external cryogenic full-aperture blackbody calibrator by cryogenic switching radiometers containing internal blackbody reference loads. In order to further minimize sources of systematic error, ARCADE 2 features a cold fully open aperture with all radiometrically active components maintained at near 2.7 K without windows or other warm objects, achieved through a novel thermal design. We discuss the design and performance of the ARCADE 2 instrument in its 2005 and 2006 flights.
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