2006/09/14 by G. Perrin, S. Lacour, J. Woillez +1 · 3 citations
Computer Science · Engineering · Physics and Astronomy · #Adaptive optics and wavefront sensing #Angular resolution (graph drawing) #Dynamic range #Exit pupil #High dynamic range #High-dynamic-range imaging #Interferometry #Optical Coherence Tomography Applications #Optical measurement and interference techniques #Pupil #Speckle imaging #Speckle pattern #Telescope #astro-ph
paper · pdf · doi:10.1111/j.1365-2966.2006.11063.x
published as Mon.Not.Roy.Astron.Soc.373:747-751,2006 · 5 pages, 3 figures. accepted for publication in MNRAS
arxiv created 2006/09/14 · openalex publication_date 2006/10/25 · arxiv updated 2009/12/01 · openalex created_date 2016/06/24 · openalex updated_date 2026/08/05
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 1:106 can be obtained in only a few tens of seconds of integration time for bright objects.