从一幅载频全息图中实现相位重构的新算法

为了实现对单幅载频下涉图进行相位重构.提出了一种避免相位"解包裹"的简易算法.该算法从载频干涉图中解出所求相位的两个偏导数,然后对两个偏导数积分从而得到所求的相位.利用该算法分别对计算机模拟的干涉图和实验所得干涉图进行相位重构,重构结果均表明该算法能够很好地从载频干涉图样中实现相化重构.并且由于避免了相位"解包裹"的过程,从而简化了相位重构的流程,同时也避免了由相位解包带来的错误或误差.此外,该方法在重构相位时,对干涉图中强度分布的不均匀性不敏感.

A New Algorithm for Phase Reconstruction from a Single Carrier-Frequency Interferogram

A new algorithm for phase reconstruction from a single carrier-frequency interferogram without phase unwrapping is proposed. The algorithm directly derives two real-valued partial derivatives of the desired phase from the interferogram. Through direct integration of the two derivatives, the desired phase with high resolution is retrieved. The algorithm needs no phase unwrapping process, so the phase error or distortion brought by unwrapping operation is avoided. The algorithmn is efficient and insensitive to the nonuniformity of the intensity distribution of the interferogram and the shape of the domain boundaries. The feasibility of the algorithm is demonstrated by both numerical simulation and experiment. The method is effective for real-time measurements of dynamical processes.