介绍了一种有限距离上大气相干长度测量系统的原理和方法, 给出了在长沙实验测量的初步测量结果。分析了大气相干长度对目标序列图像中“幸运图像”概率的影响。实验得到的数据和近地湍流强弱情况相符, 大气相干长度的变化显著影响了获得“幸运图像”的概率, 证明该种测量方法对幸运成像参数的选取具有一定的参考价值。

The principle and instrument for the measurement of atmospheric coherence are described and the results measured at Changsha are reported in this article. The impact of the atmospheric coherence length on the probability of "lucky image" is analyzed. The experimental data is coincide with the near-earth line turbulence strength, changes in atmospheric coherence length significantly affect the probability of "lucky image" , it is verified that the measurement method can provide certain reference significance of the parameter selection of lucky imaging.