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.
- INSTRUMENTATION: INTERFEROMETERS, METHODS: NUMERICAL, TECHNIQUES: IMAGE PROCESSING, TECHNIQUES: INTERFEROMETRIC, TELESCOPES
Pedretti, E., & Labeyrie, A. (1999). A hierarchical phasing algorithm for multi-element optical interferometers. Astronomy and Astrophysics Supplement Series, 137(3), 543-551. https://doi.org/10.1051/aas:1999261