21 July 2014 Near-infrared aberration tracking using a correlation algorithm on the Galactic Center
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Abstract
The GRAVITY acquisition camera has four 9x9 Shack-Hartmann sensors operating in the near-infrared. It measures the slow variations of a quasi-distorted wavefront of four telescope beams simultaneously, by imaging the Galactic Center field. The Shack-Hartmann lenslet images of the Galactic Center are generated. Since the lenslet array images are filled with the crowded Galactic Center stellar field, an extended object, the local shifts of the distorted wavefront have to be estimated with a correlation algorithm. In this paper we report on the accuracy of six existing centroid algorithms for the Galactic Center stellar field. We show the VLTI tunnel atmospheric turbulence phases are reconstructed back with a precision of 100 nm at 2 s integration.
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Narsireddy Anugu, Paulo Garcia, Antonio Amorim, Paulo Gordo, Frank Eisenhauer, Guy Perrin, Wolfgang Brandner, Christian Straubmeier, Karine Perraut, "Near-infrared aberration tracking using a correlation algorithm on the Galactic Center", Proc. SPIE 9148, Adaptive Optics Systems IV, 91485B (21 July 2014); doi: 10.1117/12.2055869; https://doi.org/10.1117/12.2055869
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