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引用次数: 2

摘要

太赫兹波的分析有三种主要形式:物理光学、几何光学和高斯光学。物理光学具有最高的精度,但在大型射电望远镜的设计中需要耗费大量的时间。此外,它只能计算辐射特性。另一方面,几何光学大大减少了计算时间。但是当设计在太赫兹频率上工作的望远镜时,它不能给出准确的结果。高斯光学是这两种方法之间的一种很好的折衷,它是设计大型射电望远镜的一种流行方法——特别是那些在太赫兹波段附近工作的射电望远镜。由于该方法考虑了衍射的影响,所以结果相当准确。本章介绍高斯光学,重点介绍其在射电望远镜设计中的应用。
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Gaussian Optics
Analysis of Terahertz waves comes in three main forms, physical optics, geometrical optics, and Gaussian optics. Physical optics has the highest accuracy but it is time consuming when it is applied in the design of large radio telescopes. Also, it is only capable of computing radiation characteristics. Geometrical optics, on the other hand, reduces computational time significantly. But it does not give accurate results when designing telescopes which are to operate at Terahertz frequencies. Gaussian optics is a good trade-off between these two methods and it is a popular approach used in the design of large radio telescopes — particularly those which operate near/in the Terahertz band. Since it accounts for the effects of diffraction, this method produces reasonably accurate results. This chapter describes Gaussian optics, with emphasis given on its application in the design of radio telescopes.
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