为了实现无衍射光斑作为直线基准在复杂噪声背景下仍能快速精确定中的目的, 采用相位扫描的方法来获得极坐标系下的无衍射光斑相位角随极角的振荡起伏, 对无衍射光斑在环向上的相位与标准正弦条纹的相位对比获得其偏离量, 通过多次迭代便实现了无衍射光斑的定中, 并进行了理论分析与测试实验。结果表明, 该算法具有良好的抗噪能力、较低的计算时耗和亚像素级的定中精度。

In order to realize fast and precise centering with non-diffracting spot as straight-line datum under complex background noise, the fluctuation of phase angle of non-diffraction spot with polar angle under polar coordinates was obtained with the phase scanning method. The deviation was the difference between the phase of non-diffraction spots on the ring direction and the phase of standard sinusoidal stripes. Finally, the centering of the non-diffraction spot can be realized after a number of iterations. Theoretical analysis and experimental verification show the method has the good ability of anti-noise, less time consumption and sub-pixel level accuracy.