利用湍流廓线获得斜程大气相干长度的实验研究
Experimental study of obtaining atmospheric coherent length from turbulence profile
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摘要: 用两种方法获得有限高度斜程大气相干长度。一种方法用安置在测量铁塔上的温度脉动仪以及多普勒声雷达测量了大气边界层下部折射率结构常数廓线，用以计算有限高度球面波斜程大气相干长度；另一种方法用系留气球搭载一个点光源，在地面用差分光学系统接收球面波到达角起伏法测量了实时斜程大气相干长度。对实验结果进行了比较和分析，二者都反映了实际大气斜程相干长度的时间变化特点。两种方法结果的相关性比较好，因此两种方法都可以在大气光学传输研究中应用。最后在实验的基础上对湍流廓线计算球面波斜程大气相干长度作了讨论。Abstract: In this paper, two methods were used to get the atmospheric coherent length of slope way in the atmospheric boundary layer. A set of microthermal sensor was installed on a 32 meters high tower, it was used to get the turbulence profile together with a Doppler sodar. The atmospheric coherent length could be gained from the integral of turbulence profile. A small bulb was hoisted with a kite balloon, a difference optical system was used to measure the atmospheric coherent length from fluctuation of arrival angle.The results of both these two methods could show the character of temporal variation. The correlation of the results was quite well. At last, some problems of getting atmospheric coherent length from the integral of turbulence profile were discussed．
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Key words:
- atmospheric coherent length /
- turbulence profile /
- slope way /
- experiment
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