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Helium‐Cooled Reference Noise Source in a 4‐kMc Waveguide

 

作者: A. A. Penzias,  

 

期刊: Review of Scientific Instruments  （AIP Available online 1965）
卷期: Volume 36, issue 1  

页码: 68-70

 

ISSN:0034-6748

 

年代: 1965

 

DOI:10.1063/1.1719329

 

出版商: AIP

 

数据来源: AIP

 

摘要:

We describe a 4‐kMc waveguide load which radiates an effective noise temperature (approximately 5°K) known to within a small fraction of a degree Kelvin. The absorber is immersed in liquid helium and the temperature distribution along the guide is measured by means of an array of germanium diode thermometers.

 

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