周期物体的衍射光场在垂直于传播方向的平面上具有周期性,衍射光场有着点对点的关联.在此基础上,提出基于反射型物体的高阶周期衍射关联成像方案,给出成像性能的理论分析和数值仿真.研究结果表明:对于反射型物体的周期衍射关联成像,当针孔点阵列的孔数确定时,随着阶数的增大,成像的可见度增大,信噪比下降.而当阶数确定时,随着针孔点阵列孔数的增加,成像的可见度和信噪比都会减小.与传统热光关联成像相比,光源大小可控,成像装置简单灵活,这为关联成像的实用化提供一种可参考方法.
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