High dynamic range imaging by pupil single‐mode filtering and remapping
High dynamic range imaging by pupil single‐mode filtering and remapping
复制标题
通过光瞳单模滤波和重映射进行高动态范围成像
DOI：
10.1111/j.1365-2966.2006.11063.x
复制
发表时间：
2006
影响因子：
4.8
通讯作者：
É. Thiébaut
中科院分区：
文献类型：
--
作者：
G. Perrin;S. Lacour;J. Woillez;É. Thiébaut
由于大气湍流的存在，即使在波长的近红外域，也很难获得具有高动态范围的高角分辨率图像。我们提出了一种新的技术来克服这个问题。其基本思想是将长基线干涉测量技术应用于单口径望远镜。望远镜的瞳孔被分解成相干的子孔径，每个子孔径供给单模光纤。出口瞳孔的重新映射允许干涉所有子孔径非冗余。利用孔径合成技术从条纹图分析中重建出无散斑噪声的高动态范围的衍射极限图像。在8米望远镜的可见光范围内进行了仿真，验证了该技术的性能。对于明亮的物体，只需要几十秒的积分时间就可以获得1:10 6的原始动态范围。
Because of atmospheric turbulence, obtaining high angular resolution images with a high dynamic range is difficult even in the near-infrared domain of wavelengths. We propose a novel technique to overcome this issue. The fundamental idea is to apply techniques developed for long baseline interferometry to the case of a single-aperture telescope. The pupil of the telescope is broken down into coherent subapertures each feeding a single-mode fibre. A remapping of the exit pupil allows interfering all subapertures non-redundantly. A diffraction-limited image with very high dynamic range is reconstructed from the fringe pattern analysis with aperture synthesis techniques, free of speckle noise. The performances of the technique are demonstrated with simulations in the visible range with an 8-m telescope. Raw dynamic ranges of 1:10 6 can be obtained in only a few tens of seconds of integration time for bright objects.