Title :
An experimental evaluation of a cryogenic noise source by a sliding short method in the frequency range of 8 GHz to 12 GHz
Author :
Iida, H. ; Shimada, Y. ; Komiyama, K.
Author_Institution :
AIST, Nat. Metrol. Inst. of Japan, Tsukuba
Abstract :
A cryogenic noise source (CNS) cooled by liquid nitrogen (LN2) is constructed and evaluated in the frequency range of 8 GHz to 12 GHz (WR-90 waveguide band). A noise temperature of the CNS is changed from the boiling temperature of LN2 by a correction factor (CF) related to loss and temperature distribution of a transmission line (TL). We have investigated the CF by a sliding short method using a total-power radiometer. Comparison results of the noise temperature by the radiometer with two calibrated noise sources proved validity of the CF.
Keywords :
cryogenics; noise measurement; radiometry; thermal noise; transmission lines; WR-90 waveguide band; boiling temperature; calibrated noise; correction factor; cryogenic noise source; frequency 8 GHz to 12 GHz; liquid nitrogen; noise temperature; total-power radiometer; transmission line; Acoustic reflection; Cryogenics; Extraterrestrial measurements; Frequency measurement; Radio frequency; Radiometry; Temperature distribution; Temperature sensors; Transmission line measurements; Transmission line theory;
Conference_Titel :
Precision Electromagnetic Measurements Digest, 2008. CPEM 2008. Conference on
Conference_Location :
Broomfield, CO
Print_ISBN :
978-1-4244-2399-6
Electronic_ISBN :
978-1-4244-2400-9
DOI :
10.1109/CPEM.2008.4574972
