哈特曼测量大气相干长度研究

研究了利用哈特曼波前传感器测量大气相干长度的两种方法:一种是测量两个子孔径恒星光波到达角起伏方差的差分像运动法;另一种是测量恒星波前分布,通过波前分布的剩余方差推算得到大气相干长度。试验测量结果表明,两种方法得到的测量结果基本一致,得到了大气相干长度的可靠数据,两种方法得到了相互验证,实现了在应用哈特曼波前传感器测量大气波前分布时,同时得到当前的大气信息,对分析哈特曼波前传感器的测量结果有参考意义。

Research on measurement of atmospheric coherence length using Shack-Hartmann wavefront sensor

Atmospheric coherence length is a very important parameter in the study of effect of atmospheric turbulence on the astronomical observation and laser propagation. Two methods of measurement of atmospheric coherence length using the Shack-Hartmann wavefront sensor are studied. One is differential image motion measure which measures the optical waves angle-of-arrival fluctuation of two subapertures. The other is to measure the wavefront distribution of stars, and the atmospheric coherence length is obtained by the residual variance of wavefront distribution. The experiment results show that the measurement results obtained by the two methods are consistent, and reliable data of atmospheric coherence length are obtained, so both methods can validate each other. The method measuring wavefront distribution and getting the current atmosphere information at the same time is achieved, and the analysis of the measurement results have reference value.