【摘要】 提出了菲涅耳波带板(FZP)无运动卷积全息术.该技术使用均匀扩展光源,使得从光源不同位置发出的光在经过FZP编码孔径之后,在物体上形成多个菲涅耳波带板投影叠加.物体的全息图是FZP投影光强分布函数与物体的光强分布函数的卷积,无需机械运动便得到物体的扫描全息图·采用数字相关解码方法实现全息图的再现·用蒙特卡罗方法模拟了菲涅耳波带板入射光束在经过散射介质以后,其出射光强分布随散射介质厚度的变化规律·结果表明:当散射介质厚度为5cm时,出射光束依然基本保持菲涅耳波带板形式的光强分布·对嵌埋在浓度为1%的Intralipid散射溶液中直径为0.4mm的金属丝进行成像实验,分别得到当散射介质厚度为1cm、3cm和5cm时的再现像,实验验证了菲涅耳波带板无运动卷积全息术用于高散射介质中物体成像的可行性·更多还原

【Abstract】 The holography of Fresnel-zone-plate (FZP) convolution without motion was proposed. The key of the technique is that the uniformly distributed source is used to make the FZP projects superposed on the object. The hologram was obtained by convoluting the FZP intensity-distribution function with the object intensity-distribution function without mechanical motion. The reconstruction of the hologram was obtained by digital correlation. The relationships between the exiting intensity distribution of FZP and the depth of the scattering media were simulated by the method of Monte Carlo. The simulation results demonstrate that the FZP intensity distribution is still maintained when the depth of the scattering media is equal to 5 cm. The imaging experiments on the 0.4 mm-diameter metal at different depth of 1 cm, 3 cm and 5 cm were carried out. The experimental results testify that the holography of FZP convolution without motion is possible to be used in imaging of objects embedded in highly scattering medium.更多还原