Robert Clélia, Conan Jean-Marc, Michau Vincent, Fusco Thierry, Vedrenne Nicolas
Office National d'Etudes et de Recherches Aérospatiales, Optics Department, Châtillon Cedex, France.
J Opt Soc Am A Opt Image Sci Vis. 2006 Mar;23(3):613-24. doi: 10.1364/josaa.23.000613.
Adaptive optics provides a real-time compensation for atmospheric turbulence that severely limits the resolution of ground-based observation systems. The correction quality relies on a key component, that is, the wavefront sensor (WFS). When observing extended sources, WFS precision is limited by anisoplanatism effects. Anisoplanatism induces a variation of the turbulent phase and of the collected flux in the field of view. We study the effect of this phase and scintillation anisoplanatism on wavefront analysis. An analytical expression of the error induced is given in the Rytov regime. The formalism is applied to a solar and an endoatmospheric observation. Scintillation effects are generally disregarded, especially in astronomical conditions. We shall prove that this approximation is not valid with extended objects.
自适应光学为严重限制地基观测系统分辨率的大气湍流提供实时补偿。校正质量依赖于一个关键部件，即波前传感器（WFS）。在观测扩展源时，WFS的精度受非等晕效应限制。非等晕会导致视场内湍流相位和收集到的通量发生变化。我们研究了这种相位和闪烁非等晕对波前分析的影响。在Rytov近似下给出了由此引起的误差的解析表达式。该形式体系应用于太阳观测和内大气层观测。闪烁效应通常被忽略，尤其是在天文条件下。我们将证明，对于扩展目标，这种近似是无效的。
