On-sky performance metric parametrization at LBTO pyramid WFS

J. C. Guerra; S. Ragland; B. Mechtley; G. Brusa; D. Miller; J. Power; G. Taylor; X. Zhang; E. Pinna

doi:10.1117/12.3020645

12 September 2024 On-sky performance metric parametrization at LBTO pyramid WFS

J. C. Guerra, S. Ragland, B. Mechtley, G. Brusa, D. Miller, J. Power, G. Taylor, X. Zhang, E. Pinna

Proceedings Volume 13097, Adaptive Optics Systems IX; 130977L (2024) https://doi.org/10.1117/12.3020645
Event: SPIE Astronomical Telescopes + Instrumentation, 2024, Yokohama, Japan

Conference Poster

Abstract

Variable seeing negatively impacts the AO performance of any adaptive optics system. For the Pyramid WaveFrontSensor sensor, it impacts the response changes that alter the wavefront sensor sensitivity. The Large Binocular Telescope Observatory AO systems use a tool called Optical Gain Tracker (Gopt) that applies a probe signal, estimates the scale factor, and updates the optical gain of the WFS. The corrected scaling factor for the slopes during the observations following seeing changes provides the LBTO AO systems with the stability of performances and WFS robustness. There are a set of subproducts from the Gopt operation that are used to monitor the system performances during the observations, such as the TipTilt Jitter Power Spectral Density (PSD), the residual modal wavefront sensor, and the knowledge of the unit of the slope RMS. These are online performance metrics for the operators and the end users to follow the system's performance in changes to the observing conditions. The analysis of the nights when the Gopt Tracking was in use has shown a high correlation between the atmospheric seeing and the slope RMS and the stability of the optical gain factor within a deviation of 10% from the perfect response (one).

(2024) Published by SPIE. Downloading of the abstract is permitted for personal use only.

Citation Download Citation

J. C. Guerra, S. Ragland, B. Mechtley, G. Brusa, D. Miller, J. Power, G. Taylor, X. Zhang, and E. Pinna "On-sky performance metric parametrization at LBTO pyramid WFS", Proc. SPIE 13097, Adaptive Optics Systems IX, 130977L (12 September 2024); https://doi.org/10.1117/12.3020645

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