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The discrete sampling of a wave-front using a Shack-Hartmann sensor limits the maximum spatial frequency we can measure and impacts sensitivity to frequencies at the high end of the correction band due to aliasing.
Further-more, the finite resolution of the sensor introduces aliasing. In this article the impact of these effects on atmospheric turbulence parameter estimation is addressed with sim-ulations. It is found that cross coupling is the dominant bias. An iterative algorithm to overcome it is presented.
6 de ene. de 2023 · Shack-Hartmann wavefront sensor plays a key role in adaptive optics (AO) systems, which detect the aberrant wavefront by an array of micro-lenslets across the aperture pupil. However, some sub-apertures would be a lack of light induced by the imperfectness of micro-lenslets or pupil shift away from the optical path.
23 de nov. de 2018 · Noise, aliasing, and modal cross-coupling (Herrmann 1981) are effects introduced by the SH-WFS which degrade the quality of the wavefront reconstructions and limit the accuracy of the method. Aliasing results from the finite spatial resolution of the SH-WFS when sampling phase gradients of turbulence-induced distorted phases which have non ...
6 de ene. de 2023 · Shack-Hartmann wavefront sensor plays a key role in adaptive optics (AO) systems, which detect the aberrant wavefront by an array of micro-lenslets across the aperture pupil.
1 de ene. de 2015 · The experimental results for an 8m telescope equipped with a 40x40 Shack-Hartmann system show a significant increase in performance over the integrator baseline and comparable performance to a...
1 de jul. de 2012 · Temporal analysis of aliasing in Shack-Hartmann wave-front sensing. July 2012. Proceedings of SPIE - The International Society for Optical Engineering 8447. DOI: 10.1117/12.925554. Authors: E....
