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Related Experiment Video

Updated: Jul 7, 2026

Exploring the Effects of Atmospheric Forcings on Evaporation: Experimental Integration of the Atmospheric Boundary Layer and Shallow Subsurface

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Published on: June 8, 2015

Modal compensation and the atmospheric-turbulence outer scale: computer simulations.

V G Orlov, V V Voitsekhovich, S Cuevas

|February 21, 2008

Summary

The turbulence outer scale significantly impacts adaptive optics performance, especially for low-order systems. Finite outer scales improve Strehl ratios for uncorrected images but can degrade corrected images.

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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

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Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

Simultaneous Measurement of Turbulence and Particle Kinematics Using Flow Imaging Techniques

Published on: March 12, 2019

Area of Science:

Astronomy and Astrophysics
Optical Engineering
Atmospheric Optics

Background:

Adaptive optics (AO) systems are crucial for high-resolution imaging in astronomy.
The turbulence outer scale is a key parameter affecting astronomical seeing.
Previous studies have not fully quantified the impact of the outer scale on AO performance.

Purpose of the Study:

To investigate the influence of the turbulence outer scale on the Strehl ratio in low-order adaptive optics systems.
To analyze how different orders of adaptive optics correction are affected by the finite outer scale.
To evaluate the effect of the finite outer scale on long-exposure images without correction.

Main Methods:

Numerical simulations were employed to examine the turbulence outer scale's effect.
The Karhunen-Loeve approach was utilized for generating wave-front samples.
A novel method for constructing outer-scale-dependent Karhunen-Loeve functions was developed and described.

Main Results:

A strong dependence of the Strehl ratio on the finite outer scale was observed for second-order AO correction (tip-tilt, defocus, astigmatism).
For higher-order AO correction, the influence of the outer scale was minimal unless its magnitude was smaller than the aperture diameter.
The finite outer scale demonstrated a positive impact on the Strehl ratio of uncorrected, long-exposure images.

Conclusions:

The turbulence outer scale is a critical factor for low-order adaptive optics systems, necessitating its accurate characterization.
Higher-order adaptive optics systems are less sensitive to the outer scale compared to lower-order systems.
The finite outer scale can be beneficial for long-exposure imaging without adaptive optics correction.