A Liquid-Helium-Cooled Absolute Reference Cold Load forLong-Wavelength Radiometric Calibration
We describe a large (78-cm) diameter liquid-helium-cooled black-body absolute reference cold load for the calibration of microwave radiometers. The load provides an absolute calibration near the liquid helium (LHe) boiling point, accurate to better than 30 mK for wavelengths from 2.5 to 25 cm (12-1....
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Lawrence Berkeley National Laboratory
1990
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ftunivnotexas:info:ark/67531/metadc882907 2023-05-15T18:22:31+02:00 A Liquid-Helium-Cooled Absolute Reference Cold Load forLong-Wavelength Radiometric Calibration Bensadoun, M. Witebsky, C. Smoot, George F. De Amici,Giovanni Kogut, A. Levin, S. United States. Department of Energy. Office of Science. 1990-05-01 34 Text https://digital.library.unt.edu/ark:/67531/metadc882907/ English eng Lawrence Berkeley National Laboratory rep-no: LBL--29007 grantno: DE-AC02-05CH11231 osti: 892912 https://digital.library.unt.edu/ark:/67531/metadc882907/ ark: ark:/67531/metadc882907 Journal Name: Review of Scientific Instruments; Journal Volume: 63; Journal Issue: 1; Related Information: Journal Publication Date: 1992 Calibration Radiometers Microwave Radiation Cryogenic Fluids Calibration Standards Design 71 Classical And Quantum Mechanics General Physics Helium Performance Article 1990 ftunivnotexas 2017-09-23T22:07:52Z We describe a large (78-cm) diameter liquid-helium-cooled black-body absolute reference cold load for the calibration of microwave radiometers. The load provides an absolute calibration near the liquid helium (LHe) boiling point, accurate to better than 30 mK for wavelengths from 2.5 to 25 cm (12-1.2 GHz). The emission (from non-LHe temperature parts of the cold load) and reflection are small and well determined. Total corrections to the LHe boiling point temperature are {le} 50 mK over the operating range. This cold load has been used at several wavelengths at the South Pole and at the White Mountain Research Station. In operation, the average LHe loss rate was {le} 4.4 l/hr. Design considerations, radiometric and thermal performance and operational aspects are discussed. A comparison with other LHe-cooled reference loads including the predecessor of this cold load is given. Article in Journal/Newspaper South pole University of North Texas: UNT Digital Library South Pole |
institution |
Open Polar |
collection |
University of North Texas: UNT Digital Library |
op_collection_id |
ftunivnotexas |
language |
English |
topic |
Calibration Radiometers Microwave Radiation Cryogenic Fluids Calibration Standards Design 71 Classical And Quantum Mechanics General Physics Helium Performance |
spellingShingle |
Calibration Radiometers Microwave Radiation Cryogenic Fluids Calibration Standards Design 71 Classical And Quantum Mechanics General Physics Helium Performance Bensadoun, M. Witebsky, C. Smoot, George F. De Amici,Giovanni Kogut, A. Levin, S. A Liquid-Helium-Cooled Absolute Reference Cold Load forLong-Wavelength Radiometric Calibration |
topic_facet |
Calibration Radiometers Microwave Radiation Cryogenic Fluids Calibration Standards Design 71 Classical And Quantum Mechanics General Physics Helium Performance |
description |
We describe a large (78-cm) diameter liquid-helium-cooled black-body absolute reference cold load for the calibration of microwave radiometers. The load provides an absolute calibration near the liquid helium (LHe) boiling point, accurate to better than 30 mK for wavelengths from 2.5 to 25 cm (12-1.2 GHz). The emission (from non-LHe temperature parts of the cold load) and reflection are small and well determined. Total corrections to the LHe boiling point temperature are {le} 50 mK over the operating range. This cold load has been used at several wavelengths at the South Pole and at the White Mountain Research Station. In operation, the average LHe loss rate was {le} 4.4 l/hr. Design considerations, radiometric and thermal performance and operational aspects are discussed. A comparison with other LHe-cooled reference loads including the predecessor of this cold load is given. |
author2 |
United States. Department of Energy. Office of Science. |
format |
Article in Journal/Newspaper |
author |
Bensadoun, M. Witebsky, C. Smoot, George F. De Amici,Giovanni Kogut, A. Levin, S. |
author_facet |
Bensadoun, M. Witebsky, C. Smoot, George F. De Amici,Giovanni Kogut, A. Levin, S. |
author_sort |
Bensadoun, M. |
title |
A Liquid-Helium-Cooled Absolute Reference Cold Load forLong-Wavelength Radiometric Calibration |
title_short |
A Liquid-Helium-Cooled Absolute Reference Cold Load forLong-Wavelength Radiometric Calibration |
title_full |
A Liquid-Helium-Cooled Absolute Reference Cold Load forLong-Wavelength Radiometric Calibration |
title_fullStr |
A Liquid-Helium-Cooled Absolute Reference Cold Load forLong-Wavelength Radiometric Calibration |
title_full_unstemmed |
A Liquid-Helium-Cooled Absolute Reference Cold Load forLong-Wavelength Radiometric Calibration |
title_sort |
liquid-helium-cooled absolute reference cold load forlong-wavelength radiometric calibration |
publisher |
Lawrence Berkeley National Laboratory |
publishDate |
1990 |
url |
https://digital.library.unt.edu/ark:/67531/metadc882907/ |
geographic |
South Pole |
geographic_facet |
South Pole |
genre |
South pole |
genre_facet |
South pole |
op_source |
Journal Name: Review of Scientific Instruments; Journal Volume: 63; Journal Issue: 1; Related Information: Journal Publication Date: 1992 |
op_relation |
rep-no: LBL--29007 grantno: DE-AC02-05CH11231 osti: 892912 https://digital.library.unt.edu/ark:/67531/metadc882907/ ark: ark:/67531/metadc882907 |
_version_ |
1766201924098457600 |