环形光栅与菲涅耳波带板自相关特性比较

Comparing the Autocorrelation Characteristics ofan FZP with That of a Circular Grating

目的比较环形光栅和菲涅耳波带板自相关哪个更接近于δ函数．方法通过计算机仿真比较面积相等的环形光栅和菲涅耳波带板．当环数相等时二者的自相关以及当环形光栅的环间距等于菲涅耳波带板最边缘的环间距时二者的自相关．结果环形光栅的自相关更接近于δ函数．结论面积相同的菲涅耳波带板和环形光栅，菲涅耳波带板条纹间隔中间稀，边缘密，而环形光栅的稀密程度均匀，当环形光栅的条纹间隔等于菲涅耳波带板最边缘的条纹间隔时，环形光栅的自相关特性比菲涅耳波带板的自相关特性更接近于δ函数．

Aim Comparing the autocorrelation of an FZP with that of a circular grating to determine which is nearer to δ function Methods By using the computer simulation to compare the characteristics of the autocorrelation of an FZP with that of a circular grating when they have the same size, on the condition that they have the same number of rings or the space between two adjacent rings of the circular grating is equal to that of the edge rings of the FZP Results The autocorrelation of the circular grating is closer to δ function Conclusion As the space between two adjacent rings of the FZP in the center is greater than that in the edge, but that of the circular grating is the same everywhere, when the space of two adjacent rings of the circular grating is equal to that of the edge rings of the FZP, the autocorrelation of the circular grating is closer to δ function