Shack-Hartmann波前传感器用于闪烁和相位起伏效应的同时测量

将每一个子孔径及相应的CCD面元作为一个光强探测系统,可以将Shack-Hartmann波前传感器用于湍流大气闪烁效应的测量.分析了该测量方法的基本原理,并结合其波前探测的功能.在近地面水平1km的湍流大气中,同时进行了闪烁和相位起伏的实验研究.将闪烁测量得到的Cn2与大口径闪烁仪测量的结果进行对比,发现两者的相关系数达0.838,验证了Shack-Hartmann波前传感器用于闪烁效应测量的可靠性.对闪烁和相位起伏效应得到的Cn2的日变化进行了对比.结果表明,两者在变化趋势上具有较好的一致性;采用双对数坐标对两种结果进行相关性分析,发现两者的相关系数达0.798.这表明将Shack-Hartmann波前传感器用于闪烁和相位起伏效应的同时测量是可行的,拓展了该传感器的使用功能.

Simultaneous Measurements on Scintillation and Phase Fluctuation of Light Propagation through Atmospheric Turbulence by Shack-Hartmann Wavefront Sensor

Shack-Hartmann wavefront sensor is used to explore irradiance scintillation effect of light propagation through atmospheric turbulence, whose subaperture and corresponding CCD element are regarded as intensity detector system. Its principle is analyzed. Experiments on phase fluctuation and scintillation are preliminarily carried out in atmospheric boundary layer over 1000 m horizontal path. Compared with the measurement results of traditional large-aperture scintillometer, it is found that the method of Shack-Hartmann wavefront sensor is reliable with correlation coefficient of 0.838. At the same time, the daily variation trend of the refractive index structure constants retrieved from the two atmospheric turbulence effects is compared. The correlation coefficient of the two C2n reaches 0.798 in the log-log grid. All the experimental results indicate that simultaneous measurement of phase fluctuation and scintillation by Shack-Hartmann wavefront sensor is feasible, which extends the function of this sensor.