Theoretical Ratio of Beam Efficiency to Aperture Efficiency
Theoretical Ratio of Beam Efficiency to Aperture Efficiency
复制标题
光束效率与孔径效率的理论比
DOI：
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发表时间：
2010
期刊：
影响因子：
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通讯作者：
R. Maddalena
中科院分区：
文献类型：
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作者：
R. Maddalena
许多校准项目都要求一种简单的方法来确定光束效率。我发现用光束效率与更广为人知的光圈效率之比来表达它是最容易的。正如我将展示的，在每个GBT项目中获得的标准指向观测可以用来确定实际的光束效率。由于光束效率很容易测量，几乎每一个GBT项目都已经对其进行了测量，因此理论光束效率对规划目的的用处远远大于实际用于天文数据校准的用处。
A number of calibration projects have asked for an easy way to determine the beam efficiency. I have found it easiest to convey this as a ratio of the beam efficiency to the better-known aperture efficiency. As I will show, the standard pointing observations obtained during every GBT project can be used to determine the actual beam efficiency. Since beam efficiency is so easily measured, with its measurement embedded into almost every GBT project already, the theoretical beam efficiency is useful for planning purposes much more than it should be used for the actual calibration of astronomical data.