部分子孔径缺光对夏克-哈特曼波前传感器波前复原的影响

Influence of Lack of Light in Partial Subapertures on Wavefront Reconstruction for Shack-Hartmann Wavefront Sensor

对比研究缺光子孔径斜率置零复原法和缺光子孔径去除复原法的波前复原误差。首先研究了单子孔径缺光的情况,分析表明:缺光子孔径斜率置零法的波前复原误差呈现随子孔径中心相对全口径中心的半径的增大而增大的规律,即孔径中心部分的缺光子孔径的复原误差小,孔径边沿缺光子孔径的复原误差大;而缺光子孔径去除法的波前复原误差在孔径上分布比较均匀并且较小。缺光的子孔径数目增加后,波前复原误差也随之增加。对比研究了多子孔径缺光的情况,结果表明缺光子孔径去除复原法虽然计算量大,但波前复原误差要小得多。

In this study,we compare the wavefront reconstruction error(WRE)of the slope zeroing and subaperture removal recovery methods for the lack of light in subapertures.For lack of light in a single subaperture,results show that the WRE of the slope zeroing method increases with the increase in the radius of the subaperture center relative to the center of the full aperture.The WRE owing to the lack of light in the subaperture in the central part of the aperture is small,whereas this error along the edge of the aperture is large.In contrast,the WRE of the subaperture removal method owing to the lack of light in the subaperture is observed to be uniform and small in the aperture.The WRE increases with the increase in the number of subapertures lacking light.In addition,we investigate and compare such cases of multiple subapertures that lack light.Results show that although the calculation of the subaperture removal method for lack of light in subapertures is complex,the WRE of the subaperture removal method is much smaller than that of the slope zeroing method.