Design and results of differential microwave radiometers (DMR) on COBE

Michael A. Janssen; Samuel Gulkis; Charles L. Bennett; Alan J. Kogut

doi:10.1117/12.157828

1 October 1993 Design and results of differential microwave radiometers on COBE

Michael A. Janssen, Samuel Gulkis, Charles L. Bennett, Alan J. Kogut

Proceedings Volume 2019, Infrared Spaceborne Remote Sensing; (1993) https://doi.org/10.1117/12.157828
Event: SPIE's 1993 International Symposium on Optics, Imaging, and Instrumentation, 1993, San Diego, CA, United States

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.

Citation Download Citation

Michael A. Janssen, Samuel Gulkis, Charles L. Bennett, and Alan J. Kogut "Design and results of differential microwave radiometers on COBE", Proc. SPIE 2019, Infrared Spaceborne Remote Sensing, (1 October 1993); https://doi.org/10.1117/12.157828

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