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A liquid-helium-cooled absolute reference cold load for long-wavelength radiometric calibrationDesign, radiometric and thermal performance, and operation of a large diameter (78 cm) liquid-helium-cooled blackbody absolute reference cold load (CL) for the calibration of microwave radiometers is described. CL provides an absolute calibration near the liquid-helium (LHe) boiling point, with total uncertainty in the radiometric temperature of less than 30 mK over the 2.5-23 cm wavelength operating range. CL was used at several wavelengths at the South Pole, Antarctica and the White Mountain Research Center, California. Results show that, for the instruments operated at 20-, 12-, 7.9-, and 4.0 cm wavelength at the South Pole, the total corrections to the LHe boiling-point temperature (about 3.8 K) were 48 +/-23, 18 +/-10, 10 +/-18, and 15 +/-mK.
Document ID
19930053926
Acquisition Source
Legacy CDMS
Document Type
Reprint (Version printed in journal)
External Source(s)
Authors
Bensadoun, Marc
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Witebsky, Chris
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
Smoot, George
(NASA Goddard Space Flight Center Greenbelt, MD, United States)
De Amici, Giovanni
(California Univ.; Lawrence Berkeley Lab., Berkeley, United States)
Kogut, AL
(California Univ.; Lawrence Berkeley Lab., Berkeley; NASA, Goddard Space Flight Center Greenbelt, MD, United States)
Levin, Steve
(California Univ.; Lawrence Berkeley Lab., Berkeley; JPL, Pasadena, United States)
Date Acquired
August 16, 2013
Publication Date
October 1, 1992
Publication Information
Publication: Review of Scientific Instruments
Volume: 63
Issue: 10:00 PM
ISSN: 0034-6748
Subject Category
Instrumentation And Photography
Accession Number
93A37923
Funding Number(s)
CONTRACT_GRANT: NSF DPP-87-16548
CONTRACT_GRANT: DE-AC03-76SF-00098
Distribution Limits
Public
Copyright
Other

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