摘要
根据CCD探测器的输出信号在动态测量范围内与入射光通量成线性的特点,提出了将Shack-Hartmann波前传感器用于湍流大气光闪烁效应测量的方法,并在1 km的水平湍流大气传输路径上开展了光强闪烁的初步测量。结果表明,测量的光强起伏方差随时间的变化基本符合近地面湍流起伏特征,在统计光强起伏过程中采用了将时间和空间序列的数据相融合的方法,大大增加了统计样本数;将传感器与大口径闪烁仪测量的折射率结构常数进行了对比,发现两者在变化趋势上具有较好的一致性,相关系数达到0.84;最后,通过不同子孔径内光强起伏的功率谱分析,进一步证明了Shack-Hartmann传感器用于光闪烁效应测量的可靠性。
Shack-Hartmann sensor is traditionally used for wave-front detection.The method that it is used to measure scintillation effect of light propagating through atmospheric turbulence is proposed based on the linearity characteristic of its charge-coupled device between output signal and light exposure in the dynamic range.Intensity scintillation experiments were preliminarily carried out in atmospheric boundary layer over 1000 meter horizontal path.Some measurement results were observed.Firstly,intensity fluctuation variance measured from experiments agrees with subaerial turbulence fluctuation attribute.Secondly,the comparison between Shack-Hartmann sensor and large aperture scintillometer shows the correlation coefficient of refractive index structure parameter reaches 0.838.Finally is the analysis of power spectrum of intensity fluctuation in different sub-apertures.So the reliability of Shack-Hartmann wave-front sensor used to measure scintillation effect of light in the atmospheric turbulence is firmly approved.
出处
《红外与激光工程》
EI
CSCD
北大核心
2007年第z2期436-439,共4页
Infrared and Laser Engineering
基金
中国科学院方向性创新项目(KGCX2-SW-413)
中国科学院合肥物质科学研究院院长基金
