Research of centroiding algorithms for extended and elongated spot of sodium laser guide star

Yayun Shao; Yudong Zhang; Kai Wei

doi:10.1117/12.2243580

24 October 2016 Research of centroiding algorithms for extended and elongated spot of sodium laser guide star

Yayun Shao, Yudong Zhang, Kai Wei

Proceedings Volume 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes; 968216 (2016) https://doi.org/10.1117/12.2243580
Event: Eighth International Symposium on Advanced Optical Manufacturing and Testing Technology (AOMATT2016), 2016, Suzhou, China

Abstract

Laser guide stars (LGSs) increase the sky coverage of astronomical adaptive optics systems. But spot array obtained by Shack-Hartmann wave front sensors (WFSs) turns extended and elongated, due to the thickness and size limitation of sodium LGS, which affects the accuracy of the wave front reconstruction algorithm. In this paper, we compared three different centroiding algorithms , the Center-of-Gravity (CoG), weighted CoG (WCoG) and Intensity Weighted Centroid (IWC), as well as those accuracies for various extended and elongated spots. In addition, we compared the reconstructed image data from those three algorithms with theoretical results, and proved that WCoG and IWC are the best wave front reconstruction algorithms for extended and elongated spot among all the algorithms.

Citation Download Citation

Yayun Shao, Yudong Zhang, and Kai Wei "Research of centroiding algorithms for extended and elongated spot of sodium laser guide star", Proc. SPIE 9682, 8th International Symposium on Advanced Optical Manufacturing and Testing Technologies: Large Mirrors and Telescopes, 968216 (24 October 2016); https://doi.org/10.1117/12.2243580

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