A hierarchical phasing algorithm for multi-element optical interferometers

Details A hierarchical phasing algorithm for multi-element optical interferometers A hierarchical phasing algorithm for multi-element optical interferometers

Jun 1999

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1999a%26as..137..543p&link_type=abstract

Astronomy and Astrophysics Supplement, v.137, p.543-551

Astronomy and Astrophysics

Astrophysics

11

Instrumentation: Interferometers, Methods: Numerical, Techniques: Image Processing, Techniques: Interferometric, Telescopes

Scientific paper

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.

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