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利用电场中液晶分子的可控双折射效应对制成电场可调的位相型衍射式菲涅耳波带片。对菲涅耳波带片的原理做了理论分析，测试了其最大衍射效率，给出不同电压Ｆ的不同衍射图像，并对衍射图像的周期性变化做了理论分析。
Using the controllable birefringence effect of liquid crystal molecules in an electric field, a phase-type diffraction Fresnel zone sheet with adjustable electric field is fabricated. The principle of Fresnel zone plate is theoretically analyzed, the maximum diffraction efficiency is tested, different diffraction images with different voltage F are given, and the periodic changes of diffraction images are analyzed theoretically.