Effect of Turbulent Outer Scale on Atmospheric Transverse Coherence Length andIsoplanatic Angles

摘要

Based on the measured altitude distributional data of the turbulence structureconstant ((C sub eta)squared), this article analyzes the effects of turbulent outer scale L sub O on atmospheric transverse coherence length r sub O and isoplanatic angle Theta sub O under the two conditions of large apertures and small apertures. Calculation results clearly show that, under conditions where L sub O is a limited value, r sub o and Theta sub O clearly increase. With regard to large aperture telescopes, in infrared wave bands--for example, wave lengths of 2.2 microns--r sub O and Theta sub O are even larger. Theta sub O can even reach 0.5 mrad.