【摘要】 研究以像增强 CCD为光电探测器的弱光 Hartmann- Shack( H- S)波前传感器在质心探测过程中阈值选取对质心探测精度的影响 .首先给出了阈值选取对质心探测系统误差和随机误差的影响 .然后定义质心测量精度的评价指标 ;并根据此指标指出阈值选取的最佳范围为 - 3σr≤ Tm≤ -σr.并以实验验证了理论分析结果更多还原

【Abstract】 Discusses threshhold determination of Hartmann Shack (H S) wavefront sensor operated with faint object, using intensified CCD as the detector. The influence of threshold selection on the centroid system errors and random errors is discussed. Estimator of accuracy of centroiding is defined, and it is pointed out that the best threshhold must be within -3 σ r≤ T m≤- σ r. The theoretical analysis is confirmed by experiments.更多还原