Physics – Optics
Scientific paper
Oct 2009
adsabs.harvard.edu/cgi-bin/nph-data_query?bibcode=2009apopt..48a..35w&link_type=abstract
Applied Optics, Vol. 48, Issue 1, pp. A35-A46
Physics
Optics
2
Atmospheric And Oceanic Optics : Active Or Adaptive Optics, Atmospheric And Oceanic Optics : Wave-Front Sensing
Scientific paper
We analyze the effect of anisoplanatic atmospheric turbulence on the measurement accuracy of an extended-source Hartmann-Shack wavefront sensor (HSWFS). We have numerically simulated an extended-source HSWFS, using a scenery of the solar surface that is imaged through anisoplanatic atmospheric turbulence and imaging optics. Solar extended-source HSWFSs often use cross-correlation algorithms in combination with subpixel shift finding algorithms to estimate the wavefront gradient, two of which were tested for their effect on the measurement accuracy. We find that the measurement error of an extended-source HSWFS is governed mainly by the optical geometry of the HSWFS, employed subpixel finding algorithm, and phase anisoplanatism. Our results show that effects of scintillation anisoplanatism are negligible when cross-correlation algorithms are used.
Rimmele Thomas
Woeger Friedrich
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