Bandwidth requirements of adaptive optical system for horizontal turbulence correction

LIU Chao; HU Li-fa; MU Quan-quan; CAO Zhao-liang; GAO Feng; WANG Yong-wei; Xuan Li

doi:10.3788/OPE.20101810.2137

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Bandwidth requirements of adaptive optical system for horizontal turbulence correction

Article | 更新时间：2020-08-12

- Bandwidth requirements of adaptive optical system for horizontal turbulence correction
- Optics and Precision Engineering Vol. 18, Issue 10, Pages: 2137-2142(2010)
- 作者机构：
  
  1. 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
  2. 中国科学院研究生院北京,100039
  3. 空军驻长春地区军事代表室,吉林长春,130012
- 作者简介：
- 基金信息：
- DOI：10.3788/OPE.20101810.2137
  CLC： O439;TH743
- Received：17 December 2009，
  
  Revised：12 March 2010，
  
  Published Online：28 October 2010，
  
  Published：20 October 2010
- 稿件说明：
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刘超, 胡立发, 穆全全, 曹召良, 高峰, 王永伟, 宣丽. 校正水平湍流波面的自适应光学系统的带宽需求[J]. 光学精密工程, 2010,18(10): 2137-2142

LIU Chao, HU Li-fa, MU Quan-quan, CAO Zhao-liang, GAO Feng, WANG Yong-wei, Xuan Li. Bandwidth requirements of adaptive optical system for horizontal turbulence correction[J]. Editorial Office of Optics and Precision Engineering , 2010,18(10): 2137-2142
刘超, 胡立发, 穆全全, 曹召良, 高峰, 王永伟, 宣丽. 校正水平湍流波面的自适应光学系统的带宽需求[J]. 光学精密工程, 2010,18(10): 2137-2142 DOI： 10.3788/OPE.20101810.2137.

LIU Chao, HU Li-fa, MU Quan-quan, CAO Zhao-liang, GAO Feng, WANG Yong-wei, Xuan Li. Bandwidth requirements of adaptive optical system for horizontal turbulence correction[J]. Editorial Office of Optics and Precision Engineering , 2010,18(10): 2137-2142 DOI： 10.3788/OPE.20101810.2137.

摘要

设计和搭建用于湍流校正的自适应光学系统时

必须考虑大气湍流波面校正所需的系统带宽。由于通常理论估计与实际的湍流情况相差很大

本文对如何进行带宽的精确测量进行了研究。通过对500 m水平距离湍流波面的大量统计

分析了湍流波面的时间功率谱密度

得出了所需要带宽(Greenwood频率)的大小

并且首次得到了带宽需求的昼夜变化规律。实验发现

所需带宽在晚上变化缓慢

围绕10~15 Hz波动;白天变化剧烈

在20~90 Hz波动。最后

通过实验确定出了功率谱密度估计所需的采样总时间为70 s

得到的实验结果为设计和搭建更加合理的自适应光学系统提供了实验依据。

Abstract

It is necessary to design an appropriate system bandwidth for an adaptive optical system to correct the atmospheric turbalence. Because the theoretical estimation for the turbulence is more different from the real atmospheric tarbulence

this paper researched the method to measure the bandwidth accurately.Through measurement of the wavefront passed through 500 m of horizontal turbulence

the phase power spectral density of turbulence wavefront was analyzed

from which the circadian variation of the bandwidth requirement was obtained for first time. It shows that the bandwidth requirement is nearly steady around 10 to 15 Hz in night time

and strongly fluctuated around 20 to 90 Hz in day time. Furthermore

it points out that the total sampling time for the estimated bandwidth must be greater than 70 s in order to acquire a more precise result. There experimental results can provide useful data for designing and can fabricate an more reasonable adaptive optical system.

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Keywords

references

RODDIER F. The effects of atmospheric turbulence in optical astronomy[J]. Progress in optics., 1981,19:281-376.[2] BABCOCK H W. The possibility of compensating astronomical seeing[J]. Publ. Astron. Soc., 1953,65:229-236.[3] PLATT B. History and principles of Shack-Hartmann wavefront sensing[J]. Journal of Refractive Surgery, 2001,17(5):573-577.[4] RODDIER F. Adaptive Optics in Astronomy[M]. Cambridge: Cambridge University Press,1999.[5] FRIED D L. Time-delay-induced mean-square error in adaptive optics[J]. J. Opt. Soc. Am. A, 1990,7(7):1224-1225.[6] TYLER G A. Bandwidth considerations for tracking through turbulence[J]. J. Opt. Soc. Am. A, 1994,11(1):358-367.[7] GREENWOOD D P. Bandwidth specification for adaptive optics systems[J]. J. Opt. Soc. Am., 1977,67(3):390-393.[8] CONAN J M, ROUSSET G, MADEC P Y. Wave-front temporal spectra in high-resolution imaging through turbulence[J]. J. Opt. Soc. Am. A,1995,12(7):1559-1570.[9] RAO C H, JIANG W H, LING N. Spatial and temporal characterization of phase fluctuations in non-Kolmogorov atmospheric turbulence[J]. Journal of Modern Optics, 2000,47(6):1111-1126.[10] KIBBLEWHITE E, CHUN M. Design of tip-tilt and adaptive optics servos using measured angle-of-arrival and phase power spectra[J]. SPIE, 1998,3353:522-530.[11] MCGAUGHEY D, JM AITKEN G. Temporal analysis of stellar wave-front-tilt data[J]. Journal of the Optical Society of America A, 1997,14(8):19671974.[12] GREENWOOD D P, FRIED D L. Power spectra requirements for wave-front-compensative systems[J]. J. Opt. Soc. Am., 1976,66(3):193-206.[13] 李华强, 宋贺伦, 饶长辉,等. 增大夏克-哈特曼波前传感器动态测量范围的方法[J]. 光学精密工程, 2008,16(7):1203-1206. LI H Q, SONG H L, RAO C H, et al.. Extrapolation method to extend dynamic range of Shack-Hartmann wave-front sensor[J]. Optics and Precision Engineering, 2008,16(7):1203-1206.(in Chinese)

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