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- W2019121463 abstract "Recent advances in electronics and fast computer control allow to envisage extremely high spatial resolution observations of the Sun through the use of a compact array of phased telescopes. Several space missions (SUN/SIMURIS, SUN-SV, MUST/SIMURIS) have been proposed in that respect and will be briefly presented. Prospects for use of the space techniques for a solar array on ground are also indicated. Independently from the different mission concepts, solar interferometric imaging presents a unique case in the domain of optical aperture synthesis since the field- of-view is extended (larger than the diffraction spot of a telescope) and because the high resolution structures are evolving very rapidly and are naturally complex (low fringe visibility). These severe constraints drive solar arrays' design towards `compact' configurations (i.e. in which the spatial frequencies plane is filled) and real-time `cophasing' (direct-- hardware--zeroing of phase fluctuations by fine delay lines). They also influence the choice of the focal instrumentation which is optimum when using a subtractive double monochromator tunable over a large spectral range and providing narrow band filtergrams (up to 0.1 angstrom). We review the concepts and design issues of a solar interferometer and present numerical simulations and laboratory experiments of the system required to cophase an array of telescopes on a complex and extended field-of-view. Aperture configurations and image reconstruction are also discussed as well as the specific real-time metrology aspects of a ground array (atmospheric constraints derived from the performances evaluation of the ASSI Program)." @default.
- W2019121463 created "2016-06-24" @default.
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- W2019121463 date "1994-06-09" @default.
- W2019121463 modified "2023-09-25" @default.
- W2019121463 title "<title>Solar interferometry: space and ground instrumental prospects</title>" @default.
- W2019121463 doi "https://doi.org/10.1117/12.177279" @default.
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