一种零平衡全功率辐射计系统NCS1。

A Null-Balanced Total-Power Radiometer System NCS1.

作者信息

Pucic Sunchana P

机构信息

National Institute of Standards and Technology, Boulder, CO 80303-3328.

出版信息

J Res Natl Inst Stand Technol. 1994 Jan-Feb;99(1):45-53. doi: 10.6028/jres.099.005.

DOI:10.6028/jres.099.005

PMID:37404356

原文链接:https://pmc.ncbi.nlm.nih.gov/articles/PMC8345259/

Abstract

A recently developed radiometer system NCS1 is used to calibrate thermal noise temperature at any frequency between 1.0 GHz and 12.0 GHz. Any cryogenic noise source can be measured; the upper limit of noise temperatures measured without a loss of accuracy is estimated to be about 10 K. For a typical hot noise source with the noise temperature of 8400 K and a reflection coefficient magnitude of 0.1, the expanded uncertainty is 1.8%, and the system sensitivity 2 K. Implemented in Type N connector, it can be easily modified to calibrate noise sources with other coaxial connectors or waveguide flanges.

摘要

最近开发的辐射计系统NCS1用于校准1.0吉赫兹至12.0吉赫兹之间任何频率的热噪声温度。任何低温噪声源均可测量；在不损失精度的情况下测量的噪声温度上限估计约为10K。对于一个典型的热噪声源，其噪声温度为8400K，反射系数大小为0.1，扩展不确定度为1.8%，系统灵敏度为2K。该系统采用N型连接器实现，可轻松修改以校准带有其他同轴连接器或波导法兰的噪声源。