摘要
数字全息的再现光场相位一般具有较高的空间变化频率,而目前CCD、CMOS的空间带宽积还很有限,容易产生欠采样并导致包裹相位中有大量不可靠数据点存在,给最小二乘相位解包裹带来困难.本文将剪切干涉原理引入到数字全息再现光场的重构中,通过改变再现光场相位梯度的计算方法减少欠采样的影响,对现有的最小二乘相位解包裹算法进行了改进.模拟计算和实验验证表明:新方法得到的相位更接近实验值,具有比传统方法更强的抗欠采样能力.
In digital holography,the reconstructed optical field phase generally has high spatial variation frequency,however,the space-bandwidth product is so limited that it is easy to introduce undersampling and to cause the existence of massive unreliable data points in the wrapped phase,which makes the least-squares phase unwrapping algorithm difficult.The principle of shearing interfermetry was introduced to refactor the digital holographic reconstructed optical field.By changing the phase gradient calculation of the reconstructed optical field,the impact of undersampling was reduced.The feasibility and validity of the new method were proved by the simulated calculation and experimental verification.And the results show that the phase obtained by the new method is closer to the experimental value and it has stronger resistance ability to undersampling than the traditional method.
出处
《光子学报》
EI
CAS
CSCD
北大核心
2011年第1期121-125,共5页
Acta Photonica Sinica
基金
国家自然科学基金(No.61067004)资助
关键词
相位解包裹
最小二乘算法
剪切干涉
欠采样
改进
Phase unwrapping
Least-square algorithm
Shearing interferomtry
Undersampling
Improvement
