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.
|Journal||Astronomy & Astrophysics Supplement|
|Publication status||Published - 1 Jun 1999|
Pedretti, E., & Labeyrie, A. (1999). A hierarchical phasing algorithm for multi-element optical interferometers. Astronomy & Astrophysics Supplement, 137, 543-551. http://adsabs.harvard.edu/abs/1999A%26AS..137..543P