18 August 2014 Distributed wavefront reconstruction with SABRE for real-time large scale adaptive optics control
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Abstract
We present advances on Spline based ABerration REconstruction (SABRE) from (Shack-)Hartmann (SH) wavefront measurements for large-scale adaptive optics systems. SABRE locally models the wavefront with simplex B-spline basis functions on triangular partitions which are defined on the SH subaperture array. This approach allows high accuracy through the possible use of nonlinear basis functions and great adaptability to any wavefront sensor and pupil geometry. The main contribution of this paper is a distributed wavefront reconstruction method, D-SABRE, which is a 2 stage procedure based on decomposing the sensor domain into sub-domains each supporting a local SABRE model. D-SABRE greatly decreases the computational complexity of the method and removes the need for centralized reconstruction while obtaining a reconstruction accuracy for simulated E-ELT turbulences within 1% of the global method's accuracy. Further, a generalization of the methodology is proposed making direct use of SH intensity measurements which leads to an improved accuracy of the reconstruction compared to centroid algorithms using spatial gradients.
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Elisabeth Brunner, Cornelis C. de Visser, Michel Verhaegen, "Distributed wavefront reconstruction with SABRE for real-time large scale adaptive optics control", Proc. SPIE 9148, Adaptive Optics Systems IV, 91482H (18 August 2014); doi: 10.1117/12.2056783; https://doi.org/10.1117/12.2056783
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