Full-field wavefront measurements with phase diversity.

Details Full-field wavefront measurements with phase diversity. Full-field wavefront measurements with phase diversity.

May 1996

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=1996a%26a...309..661a&link_type=abstract

Astronomy and Astrophysics, v.309, p.661-672

Astronomy and Astrophysics

Astrophysics

4

Atmospheric Effects, Techniques: Image Processing, Techniques: Telescopes, Sun: Granulation

Scientific paper

We apply phase diversity techniques to focused and defocused images of solar granulation to make full-field measurements of the wavefront errors due to atmospheric turbulence. From these measured wavefronts, we estimate that the size of the isoplanatic patch is between 9 and 14 arcseconds. We form a two-layer model of the atmospheric turbulence in an attempt to separate the near and far-field effects. We show that this model does not adequately separate the observed turbulence, unless the measured field of view is quite large. We conclude that there is a strong layer of turbulence near the telescope, and a weaker layer of turbulence centered at about 4km above the telescope. The measured wavefronts are averaged in order to quantify the fixed aberrations present in the telescope.

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