A hierarchical phasing algorithm for multi-element optical interferometers

E. Pedretti, A. Labeyrie

Research output: Contribution to journalArticle

14 Citations (Scopus)

Abstract

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
Number of pages9
JournalAstronomy and Astrophysics Supplement Series
Volume137
Issue number3
DOIs
Publication statusPublished - 2 Jun 1999

Keywords

  • INSTRUMENTATION: INTERFEROMETERS, METHODS: NUMERICAL, TECHNIQUES: IMAGE PROCESSING, TECHNIQUES: INTERFEROMETRIC, TELESCOPES

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