Steady measurement of atmospheric turbulence coherence length

CHEN Hao; XUAN Li; HU Li-fa; CAO Zhao-liang; MU Quan-quan

doi:10.3788/OPE.20132104.0911

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Steady measurement of atmospheric turbulence coherence length

更新时间：2020-08-12

- Steady measurement of atmospheric turbulence coherence length
- Optics and Precision Engineering Vol. 21, Issue 4, Pages: 911-918(2013)
- 作者机构：
  
  中国科学院长春光学精密机械与物理研究所应用光学国家重点实验室,吉林长春,130033
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20132104.0911
  CLC： P412
- Received：07 March 2012，
  
  Revised：10 April 2012，
  
  Published Online：20 April 2013，
  
  Published：15 April 2013
- 稿件说明：
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陈浩宣丽胡立发曹召良穆全全. 大气相干长度的稳定测量[J]. 光学精密工程, 2013,21(4): 911-918

CHEN Hao XUAN Li HU Li-fa CAO Zhao-liang MU Quan-quan. Steady measurement of atmospheric turbulence coherence length[J]. Editorial Office of Optics and Precision Engineering, 2013,21(4): 911-918
陈浩宣丽胡立发曹召良穆全全. 大气相干长度的稳定测量[J]. 光学精密工程, 2013,21(4): 911-918 DOI： 10.3788/OPE.20132104.0911.

CHEN Hao XUAN Li HU Li-fa CAO Zhao-liang MU Quan-quan. Steady measurement of atmospheric turbulence coherence length[J]. Editorial Office of Optics and Precision Engineering, 2013,21(4): 911-918 DOI： 10.3788/OPE.20132104.0911.

摘要

采用传统的一对差分星点像运动法(DIMM)测量大气相干长度r

时，受统计星点对数的限制很难得到稳定的r

数值。因此，本文提出将对波面上一对星点像运动的统计增加为对正方形分布的十二对星点像运动的统计，并利用Shack-Hartmann波前探测器采集的光点阵列实现了这种统计。畸变波面上十二对点的差分运动统计方法从空间角度上增加了大气相干长度r

采样的统计数量，从空间群的概念来说增加了中心对称统计，因此大幅降低了统计时间。实验显示：仅使用300 ms采样300幅畸变波面即可完成对大气相干长度r

的统计，得出稳定而准确的r

值，而波动只有3%。该方法解决了长期以来大气相干长度r

的统计量不确定、测定误差无法分析的问题，有助于提高地基望远镜自适应光学系统成像的精度。

Abstract

When atmospheric turbulence coherence length r

is measured by traditional Differential Image Motion Monitor(DIMM) method

it is difficult to obtain a stable r

value due to limitation of light spot pairs. Therefore

this paper proposes a statistical method to increase the statistical number of light spot pairs from one on a wavefront to twelve aligned in a square

and completes the statistics on a SHWFS light spot array captured by the Shack-Hartmann wavefront detector. The method spatially increases the statistical number of samplings and the spatial symmetry of r

measurement

so it decreases the statistical time greatly. The experiments show that only three hundred of wavefront samples gotten in 300 ms are enough to obtain the r0 with a variation less than 3%. The presented method solves the large error problem in the traditional r

measurement for long time

and has contributed to the improvement of imaging accuracy of adaptive optical systems for ground-based telescopes.

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Keywords

references

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