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| Title:
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Measurements on Active Cold Loads for Radiometer Calibration |
| Type:
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Journal articleJournal article |
| Participant(s):
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Technical University of Denmark
Email:
Technical University of Denmark
Email:
Technical University of Denmark
Email:
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| Abstract:
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Two semiconductor 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 50-100-K range. The ACLs are characterized in the operating temperature range of 0degC-50degC, 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 and performance are discussed. The test setup is described, and test campaign results indicate output temperatures of 77 and 56 K for the two ACLs. The temperature sensitivity is slightly below 0.4 K/degC for the units, and long-term stability within 2 K/year is observed. |
| Published:
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in journal: I E E E Transactions on Geoscience and Remote Sensing (ISSN: 0196-2892) (DOI: http://dx.doi.org/10.1109/TGRS.2009.2017015), vol: 47, issue: 9, pages: 3134-3139, 2009 |
| DOI:
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