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Measurements on Active Cold Loads for Radiometer Calibration

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-5...

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Published in:	IEEE transactions on geoscience and remote sensing 2009-09, Vol.47 (9), p.3134-3139
Main Authors:	Sobjaerg, S.S., Skou, N., Balling, J.E.
Format:	Article
Language:	English
Subjects:	Active cold loads (ACLs) Applied geophysics Calibration Earth sciences Earth, ocean, space Exact sciences and technology Frequency Internal geophysics microwave Microwave measurements Microwave radiometers Microwave radiometry Noise temperature Operating temperature radiometer Radiometers Semiconductor device noise Semiconductors Space cooling Stability System testing Temperature distribution Temperature sensors X-band
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container_title	IEEE transactions on geoscience and remote sensing
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creator	Sobjaerg, S.S. Skou, N. Balling, J.E.
description	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.
doi_str_mv	10.1109/TGRS.2009.2017015
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subjects	Active cold loads (ACLs) Applied geophysics Calibration Earth sciences Earth, ocean, space Exact sciences and technology Frequency Internal geophysics microwave Microwave measurements Microwave radiometers Microwave radiometry Noise temperature Operating temperature radiometer Radiometers Semiconductor device noise Semiconductors Space cooling Stability System testing Temperature distribution Temperature sensors X-band
title	Measurements on Active Cold Loads for Radiometer Calibration
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