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Experimental verification of the frozen flow atmospheric turbulence assumption with use of astronomical adaptive optics telemetry.

Authors
Type
Published Article
Journal
Journal of the Optical Society of America. A, Optics, image science, and vision
Publication Date
Volume
26
Issue
4
Pages
833–846
Identifiers
PMID: 19340258
Source
Medline
License
Unknown

Abstract

We use closed-loop deformable mirror telemetry from Altair and Keck adaptive optics (AO) to determine whether atmospheric turbulence follows the frozen flow hypothesis. Using telemetry from AO systems, our algorithms (based on the predictive Fourier control framework) detect frozen flow >94% of the time. Usually one to three layers are detected. Between 20% and 40% of the total controllable phase power is due to frozen flow. Velocity vector RMS variability is less than 0.5 m/s (per axis) on 10-s intervals, indicating that the atmosphere is stable enough for predictive control to measure and adapt to prevailing atmospheric conditions before they change.

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