Schöck Matthias, Le Mignant David, Chanan Gary A, Wizinowich Peter L, van Dam Marcos A
Department of Physics and Astronomy, 4129 Frederick Reines Hall, University of California, Irvine, Irvine, California 92697, USA.
Appl Opt. 2003 Jul 1;42(19):3705-20. doi: 10.1364/ao.42.003705.
We present a detailed investigation of different methods of the characterization of atmospheric turbulence with the adaptive optics systems of the W. M. Keck Observatory. The main problems of such a characterization are the separation of instrumental and atmospheric effects and the accurate calibration of the devices involved. Therefore we mostly describe the practical issues of the analysis. We show that two methods, the analysis of differential image motion structure functions and the Zernike decomposition of the wave-front phase, produce values of the atmospheric coherence length r0 that are in excellent agreement with results from long-exposure images. The main error source is the calibration of the wave-front sensor. Values determined for the outer scale L0 are consistent between the methods and with typical L0 values found at other sites, that is, of the order of tens of meters.
我们利用W.M.凯克天文台的自适应光学系统，对表征大气湍流的不同方法进行了详细研究。这种表征的主要问题在于区分仪器效应和大气效应，以及对相关设备进行精确校准。因此，我们主要描述分析中的实际问题。我们表明，两种方法，即差分图像运动结构函数分析和波前相位的泽尼克分解，得出的大气相干长度r0值与长曝光图像的结果高度一致。主要误差源是波前传感器的校准。两种方法确定的外尺度L0值相互一致，且与其他地点发现的典型L0值相符，即几十米量级。
