The wide-field imaging interferometry testbed
The wide-field imaging interferometry testbed
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宽视场成像干涉测量测试台
DOI：
10.1109/aero.2001.931375
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发表时间：
2001
期刊：
影响因子：
--
通讯作者：
J. Mather
中科院分区：
文献类型：
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作者：
X. Zhang;L. Feinberg;D. Leisawitz;D. Leviton;A. Martino;J. Mather
我们正在开发广域成像干涉测量测试台 (WIIT)，以支持 NASA 未来空间干涉测量任务的设计研究，特别是 SPIRIT 和 SPECS 远红外/亚毫米干涉仪。 WIIT 在光波长下工作，并使用迈克尔逊光束组合来实现宽视场成像和高分辨率光谱。它将主要用于测试在天空像平面使用大尺寸探测器阵列通过镶嵌技术获得宽视场干涉测量图像的可行性。在此设置中，每个探测器像素记录与在扫描光路长度以及改变基线间隔和方向时对天空上的特定指向范围进行平均相对应的干涉图。最终图像是通过对每个像素记录的干涉图进行空间和光谱傅里叶变换构建的，然后对所有像素进行马赛克/联合反卷积过程。以这种方式，每个探测器像素的指向范围内的图像被进一步解析为与条纹测量的最大基线间隔相对应的角分辨率。我们介绍了构建测试台的动机，展示了光学、机械、控制和数据系统设计，并描述了图像处理要求和算法。 WITT 目前正在 NASA 戈达德太空飞行中心建造。
We are developing a Wide-Field Imaging Interferometry Testbed (WIIT) in support of design studies for NASA's future space interferometry missions, in particular the SPIRIT and SPECS far-infrared/submillimeter interferometers. WIIT operates at optical wavelengths and uses Michelson beam combination to achieve both wide-field imaging and high-resolution spectroscopy. It will be used chiefly to test the feasibility of using a large-format detector array at the image plane of the sky to obtain wide-field interferometry images through mosaicing techniques. In this setup each detector pixel records interferograms corresponding to averaging a particular pointing range on the sky as the optical path length is scanned and as the baseline separation and orientation is varied. The final image is constructed through spatial and spectral Fourier transforms of the recorded interferograms for each pixel, followed by a mosaic/joint-deconvolution procedure of all the pixels. In this manner the image within the pointing range of each detector pixel is further resolved to an angular resolution corresponding to the maximum baseline separation for fringe measurements. We present the motivation for building the testbed, show the optical, mechanical, control and data system design, and describe the image processing requirements and algorithms. WITT is presently under construction at NASA's Goddard Space Flight Center.