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Durham University

Department of Physics

Staff profile

Publication details for Dr Matthew Townson

Townson, Matthew J. & Saunter, Christopher D. (2017), Reducing the Field of View in Correlating Wavefront Sensors for Solar Adaptive Optics, Adaptive Optics for Extremely Large Telescopes 5 Adaptive Optics for Extremely Large Telescopes 5 (AO4ELT5). Tenerife, Canary Islands, Instituto de Astrofísica de Canarias.

Author(s) from Durham

Abstract

Wavefront sensing for solar adaptive optics currently requires the use of extended-field Shack-Hartmann wavefront sensors. Such wavefront sensors suffer from a reduced sensitivity to high altitude turbulence due effects of measuring wavefront gradients using the relative motion within the extended-field. We discuss the performance of centroiding techniques in a correlation Shack-Hartmann wavefront sensor and the insensitivity to high altitude turbulence and propose a method for reducing the field of view required to effectively measure the wavefront gradient in order to increase the sensors sensitivity to high altitude turbulence.