少量投影数字全息层析重建实验研究  

Experimental study of digital holographic tomography by a few projections

作　　者：周文静[1] 胡文涛[1] 郭路[1] 徐强胜[1] 于瀛洁[1] 

机构地区：[1]上海大学精密机械工程系,上海200072

出　　处：《物理学报》2010年第12期8499-8511,共13页Acta Physica Sinica

基　　金：上海市博士后科研计划(批准号:09R21412900);上海市科学技术委员会国际科技合作计划(批准号:09530708700);上海大学研究生创新基金(批准号:SHUCX092195)资助的课题~~

摘　　要：提出了少量投影数字全息层析重建技术.以具有轴对称结构的光纤和非轴对称结构的石膏头像为实验样本,开展了基于单幅全息图和代数迭代重建算法的层析重建模拟分析及实验研究.模拟分析表明,代数迭代重建算法中的加权因子以及松弛因子对重建图像质量影响显著,因此对加权因子采用非线性加权计算方法,以及通过多次模拟重建结果的比较选择合适的松弛因子.层析重建实验结果表明,无论被测物体是轴对称结构或是非轴对称结构,少量投影数字全息层析重建是可行的,也是有效的.这为下一步针对生物样本内部多层折射率检测和基于单幅层析全息图实现三向实时数字全息层析重建技术研究提供了必要的基础.Digital holographic tomography by a few projections is developed.A section of fiber with symmetrical structure and a plaster head model with nonsymmetrical structure are used as test samples.Both simulation analysis and experimental results are analyzed.Simulation analysis shows that the weighted coefficient wij and the relaxation factor λ affect evidently the quality of the reconstructed image,in addition,the relaxation factor λ also influences the computer speed.Thus the weighted coefficient wij is evaluated by using a nonlinear method and the relaxation factor λ is selected appropriately by comparing several simulation reconstructions.Experimental results reveal the feasibility and the availability of digital holographic tomography by a few projections for symmetrical samples and nonsymmetrical one.In the next work,the real time digital holographic tomography based on three projections and single hologram will be developed to reconstruct the multi-refractive index of biological samples.

关 键 词：数字全息技术 层析技术 少量投影 代数迭代重建算法 

分 类 号：O438.1[机械工程—光学工程]