A hierarchical phasing algorithm for multi-element optical interferometers

E. Pedretti, A. Labeyrie

Research output: Contribution to journalArticlepeer-review


Large multi-aperture interferometers are expected to provide snap-shot images with milli- to nano-arcsecond resolution, directly at the combined focus. This requires a densified exit pupil and phased beams for all the wavelengths used. The wave analysis methods serving for adaptive optics in monolithic telescopes being inadequate for diluted apertures, we have developed a different phasing algorithm. It involves a hierarchy of aperture triplets and uses image sharpness criteria. Numerical simulations on unresolved and resolved objects show that a single iteration is generally sufficient. On wavelength-dependant objects, the proper position indexing of the monochromatic image components appears also efficiently achievable.
Original languageEnglish
Pages (from-to)543-551
JournalAstronomy & Astrophysics Supplement
Publication statusPublished - 1 Jun 1999


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