Influence of scintillations on the performance of adaptive astronomical systems with Hartmann-like wavefront sensors

Details Influence of scintillations on the performance of adaptive astronomical systems with Hartmann-like wavefront sensors Influence of scintillations on the performance of adaptive astronomical systems with Hartmann-like wavefront sensors

Mar 2001

adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2001a%26a...368.1133v&link_type=abstract

Astronomy and Astrophysics, v.368, p.1133-1136 (2001)

Physics

Optics

5

Atmospheric Effects, Instrumentaion: Adaptive Optics, Techniques: High Angular Resolution

Scientific paper

The influence of scintillations on image centroid measurements and on the phase reconstruction from Hartmann-like wavefront sensors is investigated quantitatively by means of computer simulations. It is shown that under the conditions of astronomical observations, the magnitude of the effect is between 10% (for excellent seeing) and 18% (for poor seeing). However, because the magnitude of the effect increases with the increasing of the turbulence strength, one can expect that under the strong-turbulence conditions the influence of scintillations on the image centroid can be quite strong. So, starting from agiven turbulence strength, it can be impossible to make a successful phase reconstruction from image centroid measurements. It is also shown that the scintillations affect in a different and complicated way the reconstruction quality of different aberrations. Nevertheless one can notice some general tendencies: The scintillations affect more strongly the reconstruction quality of the tip-tilt and high-order aberrations than the reconstruction quality of intermediate aberrations.

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