Astronomy and Astrophysics – Astrophysics
Scientific paper
Mar 1986
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1986a%26a...157..372c&link_type=abstract
Astronomy and Astrophysics (ISSN 0004-6361), vol. 157, no. 2, March 1986, p. 372-382.
Astronomy and Astrophysics
Astrophysics
11
Image Reconstruction, Interferometry, Telescopes, Visibility, Gradients, Optical Transfer Function, Sampling, Signal To Noise Ratios
Scientific paper
Comparing the radio domain arrays and the future optical (visible/infrared) ones, it has often been argued that the latter are only able to measure the modulus of the source's spatial spectrum, and therefore are poorly suited for imaging. This paper proposes a method for reconstruction of the phase of the spectrum, by continuity in the spatial frequency space. The basic idea is that the size of the support of the transfer function enables, through techniques similar to those developed for speckle interferometry, to reconstruct the phase inside a circle of radius D/λ in the u-v plane (D being the diameter of each telescope). The authors examine the situation for interference in the image plane or in the pupil plane. The latter is favourable, as already known, for visibility determination. But, the former is better for phase reconstruction according to the method described in this paper.
Chelli Alain
Mariotti Jean-Marie
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