摘要
通过外加周期激励对气动光学流场中相干结构的发展进行相位调制,从而获得近似周期变化的畸变波前时间序列;通过计算各相位角畸变波前的平均值,并将其共轭波前作为相应时刻的校正信号应用于畸变波前的自适应校正。对比校正前后的近场相位分布以及远场Strehl比发现:该气动光学校正方案能有效地消除相干结构产生的大尺度波前相位畸变,同时提高远场的Strehl比。
Based on the external periodical excited aero-optical flowfield, the quasi-periodical aberration wavefront time series are obtained. By computing the time-averaged wavefront , the adaptive conjugate correction wavefronts are achieved. Then the conjugate wavefronts are applied to correct the corresponding aberration wavefronts. Comparison of the near-field wavefronts and the far-field strehl ratios with and without the correction indicates： the aero -optical correction scheme can eliminate the aero- optical effects induced by coherent structures and improve the far-field strehl ratios.
出处
《红外与激光工程》
EI
CSCD
北大核心
2007年第2期270-273,共4页
Infrared and Laser Engineering
基金
国家自然科学基金资助项目(10475069)
