水平大气中横向风对自适应光学系统性能的影响

从理论上分析了光波在水平大气中传播时传播路径上的横向风对理想补偿系统和时间带宽有限的自适应光学系统性能的影响，得到了自适应光学系统的Ｓｔｒｅｈｌ比与横向风速之间的解析表达式，并据此得到了一批计算结果。这些结果表明横向风对自适应光学系统的补偿功能有很严重的影响，随着横向风速的增大，系统的Ｓｔｒｅｈｌ比迅速降低，特别是对于一定接收口径的系统，当横向风速超过一定的阈值后，加了补偿的光波的成像效果比不加补

The Influence of Transverse Wind on Performance of an Adaptive Optics System in Horizontal Atmosphere

The influences of transverse wind on the light propagation path in the horizontal atmosphere and on the performances of an ideal compensation system and an adaptive optics system with finite time bandwidth are analyzed theoretically. The analytical expression of Strehl ratio of adaptive optics system vs. the transverse wind speed has been obtained. The calculated results show that transverse wind has strong influence on the performance of an adaptive optics system. As the transverse wind speed increases, Strehl ratio of the system decreases quickly. For the adaptive optics system with certain aperture size, the image of the compensated light is worse than that of the uncompensated light while transverse wind speed exceeds a threshold value. Considering the physical structure of the atmospheric turbulence, the phenomenon has been analyzed and explained.