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对流湍流池Fried相干长度的光学结构
引用本文:张骏,曾宗泳.对流湍流池Fried相干长度的光学结构[J].光学学报,1996,16(12):790-1795.
作者姓名:张骏  曾宗泳
作者单位:中国科学院安徽光学精密机械研究所
基金项目:国家高技术863资助项目
摘    要:利用不同的方法,测量并比较了用自适应光学补偿实验的对流湍流池的相干长度,给出到达角起伏谱和起伏方差的概率分布,结果表明,在对流湍流池中,光束的到达角起伏谱满足“-8/3”幂,由于相位起伏服从正态分布,因此到达角起伏的方差呈X^2分布,到达角起伏在水平和垂直方向上的谱完全一致表明了湍流池湍流的各向同性特征,相干长度与对流湍流池上下温差的实验结果,符合以往对流湍流池的流体力学和热力学相心关系。

关 键 词:相干长度  对流湍流池  自适应光学
收稿时间:1996/1/6

Optical Structure of Fried′s Coherence Length in the Convective Turbulent Tank
Zhang Jun,Zeng Zongyong,Gong Zhiben.Optical Structure of Fried′s Coherence Length in the Convective Turbulent Tank[J].Acta Optica Sinica,1996,16(12):790-1795.
Authors:Zhang Jun  Zeng Zongyong  Gong Zhiben
Abstract:The Fried′s Coherence Length quantitatively was measured by means of two different methods in the convective turbulent tank for adaptive compensation experiments. The spectra of arrival angle fluctuations and its probability distribution were given. It was showed that the spectra of arrival angle fluctuations agreed with the theoretical prediction “-8/3” power law. The fluctuations of phase fellowed a normal distribution. The χ 2 distribution appeared to be a reasonable assumption for variance of arrival-angle fluctuations. The spectrum of arrival-angle in X axis same as the spectrum in Y axis indicated obviously that the turbulence in the tank was isotropic feature. The experimental results between the Fried's Coherence Length and temperature differences between heated-plate and cooled-plate, agreed with the similar relationship in fluid mechanics and thermodynamics experiments in the convective tank.
Keywords:fried′s coherence length  convective turbulent tank  spectrum of arrival angle fluctuation
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