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用二元光学的方法将具有滤波功能的交叉光栅和具有聚焦功能的菲涅耳波带片组合成一个复合位相型元件，用它对光学图像微分，具有光路简单、调节方便、衍射效率高、效果良好等优点．用菲涅耳衍射理论讨论这种新型微分滤波器的图像微分原理，介绍这种新型滤波元件的制作方法，并给出实验结果
The binary optical method is used to combine the cross-grating with filtering function and the Fresnel zone plate with focusing function into a compound phase-type component, which is used to differentiate the optical image. The method has the advantages of simple optical path, convenient adjustment, high diffraction efficiency, Good effect and so on. Fresnel diffraction theory is used to discuss the image differential principle of this new type of differential filter. The fabrication method of this new type of filter element is introduced and the experimental results are given