We describe a liquid helium-cooled absolute reference load for the calibration of a. 2.5 GHz radiometer. This calibration system provides an absolute reference near the liquid helium boiling point. The accuracy of the reference source is better than 100 mK. We use this cold load to perform absolute temperature measurements of the cosmic microwave background radiation. (C) 1995 American Institute of Physics.
Gervasi, M., Bonelli, G., Sironi, G., Cavaliere, F., Passerini, A., Casani, S. (1995). AN ABSOLUTE CRYOGENIC CALIBRATION SOURCE FOR A 2.5 GHZ RADIOMETER. REVIEW OF SCIENTIFIC INSTRUMENTS, 66(10), 4798-4805 [10.1063/1.1146155].
AN ABSOLUTE CRYOGENIC CALIBRATION SOURCE FOR A 2.5 GHZ RADIOMETER
GERVASI, MASSIMO;SIRONI, GIORGIO;PASSERINI, ANDREA;
1995
Abstract
We describe a liquid helium-cooled absolute reference load for the calibration of a. 2.5 GHz radiometer. This calibration system provides an absolute reference near the liquid helium boiling point. The accuracy of the reference source is better than 100 mK. We use this cold load to perform absolute temperature measurements of the cosmic microwave background radiation. (C) 1995 American Institute of Physics.
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