基于多对流速度的波前重构算法研究

Wavefront reconstruction arithmetic based on multi-convection velocity

在气动光学研究中,Ronald J.Hugo和Eric J.Jumper的小孔径光束技术(SABT)波前重构算法在理论推导中忽略了与涡结构尺度相关的对流速度的差异,因此必然会给波前重构带来误差。用小波分析提取了上、下游探测光束输出的不同尺度的光程信号,通过计算两个探测光束输出的同一尺度信号的互相关系数,并利用互相关系数达到最大值对应的延迟时间研究了尺度相关的对流速度,然后再进行尺度相关的小孔径光束波前重构。结果表明:相对于单一对流速度的小孔径光束波前重构算法,该尺度相关的波前重构算法能有效地提高波前重构的精度。

A fast time-resolved aberration wavefront reconstruction method named SABT has been applied in the study of aero-optics. The introduction of scale-independent convection velocity hypothesis results in the wavefront measured errors. The measured signals were multl-seale decomposed by wavelet analysis and the scale-dependent convection velocities are computed with correlation method, then the scale-dependent convection veloelties are used to reconstruct the wavefronts. The results indicate that the scale-dependent SABT can improve the precision of wavefront reconstruction than single convection velocity SABT.