Pupil plane interferometry in the near infrared. II - Phase recovery and image reconstruction

Details Pupil plane interferometry in the near infrared. II - Phase recovery and image reconstruction Pupil plane interferometry in the near infrared. II - Phase recovery and image reconstruction

Jul 1992

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1992a%26a...260..510m&link_type=abstract

Astronomy and Astrophysics (ISSN 0004-6361), vol. 260, no. 1-2, p. 510-516.

Astronomy and Astrophysics

Astronomy

4

Astronomical Interferometry, Image Reconstruction, Infrared Astronomy, Interstellar Space, Near Infrared Radiation, Wave Fronts

Scientific paper

We describe a 2D method to extract the phase of turbulence-blurred near-IR interferograms in the plane of the telescope pupil. The instrument and its principle have been described by Mariotti et al. (1992). The phase data are obtained from near-IR interference fringes produced by a Michelson interferometer in the image of the telescope pupil. We have developed an equivalent of the Knox-Thompson algorithm, using the spatial correlation of the phase over the pupil to recover the actual 2D phase of the complex visibility function. We compute and average the spatial gradients of the instantaneous phase, and a minimal norm least squares method is then used to recover the actual phase over the pupil. The modulus and the phase can be used to recover diffraction-limited images. We present an application of the method on a simulated binary system, together with first results on some astronomical data recently obtained at the 4.20-m William Herschel Telescope of the Royal Greenwich Observatory at La Palma. Tentative deconvolutions are presented.

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