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Proceedings Paper

Design and results of differential microwave radiometers (DMR) on COBE
Author(s): Michael A. Janssen; Samuel Gulkis; Charles L. Bennett; Alan J. Kogut
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Paper Abstract

The Differential Microwave Radiometer (DMR) experiment on the Cosmic Background Explorer is in the final year of a scheduled four years of operation to measure large- and intermediate-scale anisotropies in the Cosmic Microwave Background (CMB). The DMR instrument comprises two independent radiometers at each of three frequencies, 31.5, 53, and 90 GHz, where the frequencies were chosen to best separate the CMB from the foreground emissions from galactic dust and electrons. The radiometers switch symmetrically between two beams of 7 degree(s) half-power width separated by 60 degree(s) on the sky, and provide a data set of sky brightness temperature differences that allows the determination of all-sky maps of brightness temperature variations at 7 degree(s) resolution. Data from the first year's operation were used to produce maps of unprecedented sensitivity in which the long-sought intrinsic anisotropies were identified. Three more years of data will ultimately be available to refine the anisotropy measurements.

Paper Details

Date Published: 1 October 1993
PDF: 11 pages
Proc. SPIE 2019, Infrared Spaceborne Remote Sensing, (1 October 1993); doi: 10.1117/12.157828
Show Author Affiliations
Michael A. Janssen, Jet Propulsion Lab. (United States)
Samuel Gulkis, Jet Propulsion Lab. (United States)
Charles L. Bennett, NASA Goddard Space Flight Ctr. (United States)
Alan J. Kogut, NASA Goddard Space Flight Ctr. (United States)

Published in SPIE Proceedings Vol. 2019:
Infrared Spaceborne Remote Sensing
Marija S. Scholl, Editor(s)

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