Challenges in application of Active Cold Loads for microwave radiometer calibration

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Abstract

Two Active Cold Loads (ACLs) for microwave radiometer calibration, operating at X-band, are evaluated with respect to important stability parameters. Using a stable radiometer system as test bed, absolute levels of 77 K and 55 K are found. This paper identifies and summarizes potential challenges and uncertainties in future application of ACLs in air and space borne missions, and important parameters, such as temperature sensitivity and long term stability are addressed. For the devices under test, temperature sensitivities are found to be in the range from 0.2 K/°C to 0.4 K/°C, and typical long term drift up to 1.5 K/year is estimated.
Original languageEnglish
Title of host publicationProceedings of the 12th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)
Number of pages4
Place of PublicationRome
PublisherIEEE
Publication date2012
ISBN (Print)978-1-4673-1468-8
DOIs
Publication statusPublished - 2012
Event12th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad) - Tor Vergata University of Rome Villa Mondragone, Rome, Italy
Duration: 5 Mar 20129 Mar 2012
Conference number: 12
http://www.microrad2012.org/

Conference

Conference12th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad)
Number12
LocationTor Vergata University of Rome Villa Mondragone
CountryItaly
CityRome
Period05/03/201209/03/2012
Internet address

Keywords

  • Calibration
  • Radiometry
  • Switches
  • Temperature measurement
  • Temperature sensors
  • Thermal stability
  • Active cold load
  • Radiometer

Cite this

Søbjærg, S. S., Balling, J. E., & Skou, N. (2012). Challenges in application of Active Cold Loads for microwave radiometer calibration. In Proceedings of the 12th Specialist Meeting on Microwave Radiometry and Remote Sensing of the Environment (MicroRad) IEEE. https://doi.org/10.1109/MicroRad.2012.6185258