反投影滤波重建功能材料梯度折射率模拟分析  

Simulation reconstruction analysis of gradient refractive index for functionally gradient materials based on filtered back projection

作　　者：周文静[1] 李海鹏[1] 韩冰[1] 

机构地区：[1]上海大学精密机械工程系,上海200072

出　　处：《功能材料》2014年第15期15060-15064,共5页Journal of Functional Materials

基　　金：国家自然科学基金青年科学基金资助项目(61107004);上海市教委创新基金资助项目(12zz088)

摘　　要：开展功能材料梯度折射率分布反投影滤波重建效果及其最小折射率分辨率的模拟分析。为提高折射率重建分辨率,选取适用于多投影方向的滤波反投影算法,分别分析了轴向梯度变化及径向梯度变化的两类功能材料梯度折射率重建效果,相同模拟条件下,重建误差均约为1%;同时也模拟分析了上述两类梯度折射率的最小分辨率,模拟结果表明,当投影量保持为90不变的情况下,径向梯度变化折射率较轴向梯度变化折射率重建准确度高,且相邻梯度间隔>0.003时,重建得到的两种梯度变化趋势的梯度折射率分布仍然能较好地分辨出其梯度间隔。As parameters of functionally gradient materials were hard to represent,reconstruction method based on compressive sensing digital holographic tomography was proposed.In order to improve the reconstructed res-olution of refractive index,this paper focuses on simulation analysis of the tomographic reconstruction effect and resolution of functionally gradient materials’gradient refractive index.Functional materials with radical or axial varient refractive index are analyzed,and reconstruction results were compared.In the same simulation condition,the reconstruction error are all 1%.The resolution of reconstruction was also analyzed in simulation situation.From the simulation result,when the number of projection was 90,radial reconstruction error was lower than axial reconstruction.In addition,the gradient intervals can be identified from the reconstructed gra-dient trend of refractive index when the original gradient interval was larger than 0.003.

关 键 词：全息层析重建 滤波反投影算法 功能梯度材料 梯度折射率 

分 类 号：TB332[一般工业技术—材料科学与工程]