中国激光, 1997, 24 (7): 635, 网络出版: 2006-10-31  

大气湍流对有限带宽波前补偿系统的影响

Effect of Atmospheric Turbulence on the Finite bandwidth of a Wavefront Compensative System
作者单位
中国科学院安徽光机所, 合肥 230031
摘要
利用高灵敏度湍流探空仪的测量结果,给出了几种典型情况下大气湍流的特征模式。着重讨论冬、夏两季平面波通过大气湍流对有限带宽的自适应光学补偿系统的影响。分析了当自适应光学闭环的频率响应传递函数为H(f)时,不同带宽波前系统的补偿效果。结果表明:当系统带宽为40 Hz时,Strehl比可高于0.85。冬季虽高空风速强于40 ms,但Strehl比没有显著减小。
Abstract
In this paper, several models of the vertical profile of C 2 n were given using home made high sensitivity micro temperature apparatus. We discussed mainly the effect of atmosphere turbulence on the finite bandwidth of a wavefront compensative system when the wavefront phase of the plane wave went through the atmospheric turbulence in summer or in winter. The Strehl ratios for various bandwidths of the wavefront compensative system were given when a closed loop transfer function H(f) was used as a model of a closed-loop control system that processed the turbulence-induced wavefront distortions. For the low control bandwidth fc=40 Hz, the Strehl ratio could be large than 0.85. Although the wind speed of the free atmosphere in the winter was 40.0 m/s, much stronger than in summer, the difference of the Strehl ratio in the two seasons was small.
参考文献

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张骏, 曾宗泳. 大气湍流对有限带宽波前补偿系统的影响[J]. 中国激光, 1997, 24(7): 635. 张骏, 曾宗泳. Effect of Atmospheric Turbulence on the Finite bandwidth of a Wavefront Compensative System[J]. Chinese Journal of Lasers, 1997, 24(7): 635.

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