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首页> 外文期刊>Optik: Zeitschrift fur Licht- und Elektronenoptik: = Journal for Light-and Electronoptic >A phase-diversity speckle experimental system for one meter-scale ground-based telescope
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A phase-diversity speckle experimental system for one meter-scale ground-based telescope

机译:一米尺度地基望远镜的相散散斑实验系统

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摘要

Phase-diversity (PD) is the least square adaptive-filter of the imaging system based on wave optics theory. It can use unknown extended object as the observation object to collect two or more images whose wave front diversities are known and fixed. According to the images, the wave-front of the optical system can be calculated by PD, and simultaneously the estimation of ideal image for the observation object can be obtained. Phase-diverse speckle (PDS) technique extends PD by using a series of short-expose frames as the input. In this paper, we designed PDS experiment on a 1.23 m telescope and successfully got clear restored images of space objects. Under the observation condition that the atmospheric coherent length was not more than 8 cm at 500 nm wavelength in Changchun city, we replaced the deformable mirror with a plane mirror in adaptive optical system and separately used the moon and Polaris as the observation objects. For Polaris, the FWHW reduced from 20.6 to 5.3 (in pixel), which decreased about 74%. The experimental results demonstrate that PDS algorithm can be used on one meter-scale telescope in practical observation. (C) 2015 Elsevier GmbH. All rights reserved.
机译:基于波光学理论,相差(PD)是成像系统的最小二乘自适应滤波器。它可以使用未知的扩展对象作为观察对象,以收集两个或更多个波前分集已知且固定的图像。根据这些图像,可以通过PD计算光学系统的波前,同时可以获得对观察对象的理想图像的估计。相散斑(PDS)技术通过使用一系列短曝光帧作为输入来扩展PD。在本文中,我们在1.23 m望远镜上设计了PDS实验,并成功获得了清晰的空间物体还原图像。在长春市在500 nm波长大气相干长度不超过8 cm的观测条件下,我们在自适应光学系统中用平面镜代替了可变形镜,并分别以月球和北极星为观测对象。对于Polaris,FWHW从20.6降低到5.3(以像素为单位),降低了约74%。实验结果表明,在实际观测中,PDS算法可以在一米尺度的望远镜上使用。 (C)2015 Elsevier GmbH。版权所有。

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