论文部分内容阅读
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 To compare which of the annular grating and the Fresnel zone plate autocorrelation is closer to the delta function. Methods By computer simulation to compare the area of equal annular grating and Fresnel zone plate. The autocorrelation between the two when the number of rings is equal and the autocorrelation between the two when the ring pitch of the ring grating equals the ring spacing at the extreme edge of the Fresnel zone plate. As a result, the auto-correlation of the ring grating is closer to the delta function. Conclusion The area of the same area of the Fresnel zone plate and the ring grating, Fresnel zone strip stripe spacing thin, edge dense, while the ring grating even density, when the ring grating stripe spacing equal to the Fresnel zone plate At the fringe fringe spacing, the autocorrelation of the annular grating is closer to the delta function than the autocorrelation of the Fresnel zone plate.