【摘要】 自适应光学系统中应用哈特曼波前传感器对点源目标进行质心探测时,光电探测器上子孔径区域内存在的盲元会引入一定的附加质心探测误差,为了减小质心误差,需要选取合适的盲元补偿算法获得相对合理的补偿值。推导了哈特曼波前传感器子孔径内单个盲元补偿后造成的附加质心探测误差。利用仿真统计了各种利用盲元邻域正常像素进行线性插值的单个盲元补偿算法对点源目标质心探测误差的影响。提出了单个盲元邻域像素线性插值补偿算法选取的若干准则,指出选用盲元上下左右4邻域像素的均值进行补偿造成的平均质心误差最小,而选用盲元左右两个像素平均补偿算法可以在补偿误差较小的情况下简化运算。实验结果与仿真结果相符合。更多还原

【Abstract】 In adaptive optics system utilizing Shack-Hartmann wavefront sensor,the single blind pixel in subaperture area on the detector causes additional error in point source centroid detection.To obtain a reasonable value to substitute the single blind pixel,some proper compensation algorithm is needed.The formula of additional centroid detection error induced by the compensation of single blind pixel was deduced.For different single blind pixel compensation algorithms that utilize normal neighborhood pixels for linear interpolation,their influences on centroid detection error were analyzed statistically by simulation.Some guide lines for choosing the proper single blind pixel compensation algorithms were presented.Among the compensation algorithms,the least average centroid error can be obtained by using the algorithm that uses the average value of the four normal neighboring pixels which was on the upside,downside,left side and right side of the single blind pixel respectively.To simplify the calculation,the algorithm that uses the average value of the two normal neighborhood pixels which is on the left side and right side respectively can be adopted,meanwhile the average centroid error remains small.The experimental results are in great accordance with simulation data.更多还原