Wide-field imaging interferometry testbed I: purpose, testbed design, data, and synthesis algorithms
Wide-field imaging interferometry testbed I: purpose, testbed design, data, and synthesis algorithms
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广域成像干涉测量测试台 I：目的、测试台设计、数据和综合算法
DOI：
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发表时间：
2002
期刊：
影响因子：
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通讯作者：
Xiaolei Zhang
中科院分区：
文献类型：
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作者：
D. Leisawitz;B. Frey;D. Leviton;A. Martino;William L. Maynard;L. Mundy;S. Rinehart;S. Teng;Xiaolei Zhang
设计了宽视场成像干涉测量试验台，对光学/红外干涉仪的宽视场拼接成像技术进行验证、实验和完善。我们为WIIT提供了动力，提出了试验台设计，并描述了可用于减少空间和光谱迈克尔逊干涉仪数据的算法。传统的单探测器迈克尔逊干涉仪在中心波长lc处工作，其视场被限制在单个望远镜孔径的主光束范围内，即~λc/dtel弧度，其中dtel为望远镜直径。这样的领域对于许多应用来说太小了；人们通常希望对扩展源进行成像。我们正在开发和测试类似于毫米和射电天文学中使用的镶嵌方法的技术，但适用于光学/红外迈克尔逊干涉仪，其中光束组合在瞳孔平面上完成。在干涉仪的像面上放置一个Npix × Npix阵列探测器，同时记录来自多个连续望远镜视场的条纹图案，有效地将视场大小乘以Npix/2，其中因子2允许奈奎斯特采样。这项技术对于空间干涉天文台，如空间红外干涉望远镜和亚毫米宇宙结构演化探测器，将特别有价值。
The Wide-field Imaging Interferometry Testbed was designed to validate, experiment with, and refine the technique of wide field mosaic imaging for optical/IR interferometers. We offer motivation for WIIT, present the testbed design, and describe algorithms that can be used to reduce the data from a spatial and spectral Michelson interferometer. A conventional single-detector Michelson interferometer operating with narrow bandwidth at center wavelength lc is limited in its field of view to the primary beam of the individual telescope apertures, or ~λc/dtel radians, where dtel is the telescope diameter. Such a field is too small for many applications; often one wishes to image extended sources. We are developing and testing techniques analogous to the mosaicing method employed in millimeter and radio astronomy, but applicable to optical/IR Michelson interferometers, in which beam combination is done in the pupil plane. An Npix × Npix array detector placed in the image plane of the interferometer is used to record simultaneously the fringe patterns from many contiguous telescope fields, effectively multiplying the field size by Npix/2, where the factor 2 allows for Nyquist sampling. This technique will be especially valuable for interferometric space observatories, such as the Space Infrared Interferometric Telescope and the Submillimeter Probe of the Evolution of Cosmic Structure.