Issue |
A&A
Volume 368, Number 3, March IV 2001
|
|
---|---|---|
Page(s) | 1133 - 1136 | |
Section | Numerical methods and codes | |
DOI | https://doi.org/10.1051/0004-6361:20010060 | |
Published online | 15 March 2001 |
Influence of scintillations on the performance of adaptive astronomical systems with Hartmann-like wavefront sensors
Instituto de Astronomia, UNAM AP 70-264 Cd. Universitaria, 04510 Mexico D.F., Mexico
Corresponding author: V. V. Voitsekhovich, voisteko@astroscu.unam.mx
Received:
10
November
2000
Accepted:
8
January
2001
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.
Key words: atmospheric effects / instrumentaion: adaptive optics / techniques: high angular resolution
© ESO, 2001
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