Wavefront profiling via correlation of GLAO open loop telemetry

Eden A. McEwen; Ryan Dungee; Mark Chun; Jessica R. Lu; Olivier Lai; Christoph Baranec

doi:10.1117/12.2629613

29 August 2022 Wavefront profiling via correlation of GLAO open loop telemetry

Eden A. McEwen, Ryan Dungee, Mark Chun, Jessica R. Lu, Olivier Lai, Christoph Baranec

Proceedings Volume 12185, Adaptive Optics Systems VIII; 121855U (2022) https://doi.org/10.1117/12.2629613
Event: SPIE Astronomical Telescopes + Instrumentation, 2022, Montréal, Québec, Canada

Conference Poster

Abstract

Adaptive Optics (AO) used in ground based observatories can be strengthened in both design and algorithms by a more detailed understanding of the atmosphere they seek to correct. Nowhere is this more true than on Maunakea, where a clearer profile of the atmosphere informs AO system development from the small separations of Extreme AO (ExAO) to the wide field Ground Layer AO (GLAO). Employing telemetry obtained from the imaka GLAO demonstrator on the University of Hawaii 2.2-meter telescope, we apply a wind profiling method that identifies turbulent layer velocities through spatial-temporal cross correlations of multiple wavefront sensors (WFSs). We compare the derived layer velocities with nearby wind anemometer data and meteorological model predictions of the upper wind speeds and discuss similarities and differences. The strengths and limitations of this profiling method are evaluated through successful recovery of injected, simulated layers into real telemetry. We detail the profilers' results, including the percentage of data with viable estimates, on four characteristic imaka observing runs on open loop telemetry throughout both winter and summer targets. We report on how similar layers are to external measures, the confidence of these results, and the potential for future use of this technique on other multi conjugate AO systems.

Citation Download Citation

Eden A. McEwen, Ryan Dungee, Mark Chun, Jessica R. Lu, Olivier Lai, and Christoph Baranec "Wavefront profiling via correlation of GLAO open loop telemetry", Proc. SPIE 12185, Adaptive Optics Systems VIII, 121855U (29 August 2022); https://doi.org/10.1117/12.2629613

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