Measurements on Active Cold Loads for Radiometer Calibration

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Two semi-conductor Active Cold Loads (ACLs) to be used as cold references in spaceborne microwave radiometers have been developed. An X-band frequency was chosen, and the target noise temperature value was in the 50 to 100 K range. The ACLs are characterized in the operating temperature range 0 50 degrees C, and long term stability is assessed. To this end a Test Bed has been developed. This Test Bed is actually a stable radiometer, and its design is briefly reviewed. The test setup is described, and preliminary test campaign results indicate output temperatures of 77 K and 55 K for the two ACLs. The temperature sensitivity is slightly below 0.4 K/degrees C for the units, and excellent long term stability prevails.
Original languageEnglish
Title of host publicationMicrowave Radiometry and Remote Sensing of the Environment : MICRORAD 2008
Number of pages4
PublisherIEEE Press
Publication date2008
ISBN (Print)978-1-4244-1986-9
Publication statusPublished - 2008
EventMicrorad´08 -
Duration: 1 Jan 2008 → …


Period01/01/2008 → …

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Skou, N., Søbjærg, S. S., & Balling, J. E. (2008). Measurements on Active Cold Loads for Radiometer Calibration. In Microwave Radiometry and Remote Sensing of the Environment: MICRORAD 2008 IEEE Press.