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Improving imaging through turbulence via aperture partitioning

机译:通过孔径分隔通过湍流改善成像

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Speckle imaging techniques make it possible to do high-resolution imaging through the turbulent atmosphere by collecting and processing a large number of short-exposure frames, each of which effectively freezes the atmosphere. In severe seeing conditions, when the characteristic scale of atmospheric fluctuations is much smaller than the diameter of the telescope, the reconstructed image is dominated by "turbulence noise" caused by redundant baselines in the pupil. I describe a generalization of aperture masking interferometry that dramatically improves imaging performance in this regime. The approach is to partition the aperture into annuli, form the bispectra of the focal plane images formed from each annulus, and recombine them into a synthesized bispectrum from which the object may be retrieved. This may be implemented using multiple cameras and special mirrors, or with a single camera and a suitable pupil phase mask. I report results from simulations as well as experimental results using telescopes at the Air Force Research Lab's Maui Space Surveillance Site.
机译:散斑成像技术使得可以通过收集和加工大量短曝光框架来完成高分辨率的成像,每个短曝光框架都有效地冻结了大气。在严重的看到条件下,当大气波动的特征尺度远小于望远镜的直径时,重建的图像由瞳孔中的冗余基线引起的“湍流噪声”主导。我介绍了孔径掩蔽干涉测量中的概括,这在该制度中显着提高了成像性能。该方法是将光圈分配到亚里里,形成由每个环形形成的焦平面图像的BISPectRA,并将它们重新结合到合成的双谱中,从中可以检索物体。这可以使用多个摄像机和特殊镜子来实现,或者用单个相机和合适的瞳孔相位掩模来实现。我向模拟的结果以及使用望远镜在空军研究实验室的毛伊毛空间监测场地的实验结果。

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