Simulations of multimode bolometric interferometers
Simulations of multimode bolometric interferometers
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多模测辐射热干涉仪的仿真
DOI：
10.1117/12.671879
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发表时间：
2006
期刊：
影响因子：
--
通讯作者：
S. Withington
中科院分区：
文献类型：
--
作者：
G. Saklatvala;M. Hobson;S. Withington
我们描述了一种模式理论的干涉，适合于建模的多模测辐射热干涉仪，并提出了第一个模拟这样的干涉仪。工作的动机是希望联合收割机的低噪声特性的辐射热计与孔径合成技术设计远红外和亚毫米干涉仪，而不需要单模组件，限制功率吞吐量，从而降低信噪比。这种干涉仪的分析已被证明是不可能的，在过去，因为在亚毫米波长的光学系统是部分相干的，和测辐射热计不仅响应的强度，但也在现场的相关性。为了评估的可行性测辐射热干涉仪，因此，我们需要一个多模干涉理论。我们表明，适当的模式用于描述干涉仪的希尔伯特-施密特分解的内核的积分算子描述的个别望远镜，并证明，这些模式提供了一个清晰的概念理解的操作的干涉仪和一个非常快速的计算方法。我们提出了理想化的迈克尔逊和斐索干涉仪的模拟，并表明，这种干涉仪的正常行为恢复。我们显示模拟源，和脏地图从紫外线数据模拟迈克尔逊干涉仪。讨论了该理论在真实的仪器设计中的应用。
We describe a modal theory of interferometry, suitable for the modelling of multimode bolometric interferometers, and present the first simulations of such an interferometer. The motivation for the work is the wish to combine the low noise properties of bolometers with aperture synthesis techniques to design far-infrared and sub-mm interferometers, without the need for single-mode components that restrict the power throughput and therefore reduce the signal to noise ratio. The analysis of such interferometers has proved impossible in the past because optical systems at sub-mm wavelengths are partially coherent, and bolometers respond not only to the intensity but also to the correlations in the field. In order to assess the viability of bolometric interferometers, we therefore require a multimode theory of interferometry. We show that the appropriate modes for describing an interferometer are the Hilbert-Schmidt decompositions of the kernels of the integral operators describing the individual telescopes, and demonstrate that these modes provide both a clear conceptual understanding of the operation of an interferometer and an extremely fast method of computation. We present simulations of idealized Michelson and Fizeau interferometers, and show that the normal behaviour of such interferometers is recovered. We show simulated sources, and dirty maps obtained from uv data for a simulated Michelson interferometer. We discuss the application of the theory to real instrument design.