Measuring and modeling the low-frequency behavior of atmospheric distortion

Donald R. McGaughey; George J. M. Aitken

doi:10.1117/12.390365

7 July 2000 Measuring and modeling the low-frequency behavior of atmospheric distortion

Donald R. McGaughey, George J. M. Aitken

Proceedings Volume 4007, Adaptive Optical Systems Technology; (2000) https://doi.org/10.1117/12.390365
Event: Astronomical Telescopes and Instrumentation, 2000, Munich, Germany

Abstract

The low-frequency behavior of atmospherically distorted wavefronts is not accurately known at this time. It is expected that the phase delays will be a zero mean random process. A new zero-low-frequency model of spatial PSD of the phase distortions is presented in this paper. This model has a low frequency, called the roll-over frequency, for which the PSD starts to approach zero as the frequency decreases and approaches zero. This roll-over frequency is proportional to the outer-scale of turbulence. To verify the zero-low- frequency model, wavefront slope data was analyzed from the GSM experiment with a nonlinear modelling technique called Robust Orthogonal Search (ROS). One property of ROS is that it can detect frequency components at frequencies lower than the resolution of the discrete Fourier transform. This investigation consistently indicates a lowest frequency in the data for which any lower frequency components have lower power. This results supports the low-frequency model which rolls over and approaches zero for low spatial frequencies.

Citation Download Citation

Donald R. McGaughey and George J. M. Aitken "Measuring and modeling the low-frequency behavior of atmospheric distortion", Proc. SPIE 4007, Adaptive Optical Systems Technology, (7 July 2000); https://doi.org/10.1117/12.390365

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