Du Hubing, Zhao Hong, Li Bing, Zhao Jinlei, Cao Shixun
State Key Laboratory for Manufacturing Systems Engineering, Xi’an Jiaotong University, Xi’an, Shaanxi, China.
Appl Opt. 2011 Dec 20;50(36):6708-12. doi: 10.1364/AO.50.006708.
We proposed a general algorithm for phase-shifting shadow moiré by an iterative self-tuning algorithm. In our proposed system, the grating is translated in equal distance to introduce phase shifts across the field of view. The proposed algorithm produces accurate phase information with five interferograms and can calibrate the precise phase step during the process of the height demodulation. Compared with the traditional method, the proposed algorithm is insensitive to the height dependent effects, which is the main systematic source of error in phase-shift shadow moiré when reconstructing surfaces from fringe patterns. Numerical simulations and optical experiments show that the proposed method can eliminate the nonuniform phase-shift error and possesses a superior performance to existing typical phase-shifting algorithms.
我们提出了一种通过迭代自调整算法实现相移阴影莫尔条纹的通用算法。在我们提出的系统中，光栅以相等的距离平移，以在视场中引入相移。所提出的算法通过五幅干涉图产生精确的相位信息，并且可以在高度解调过程中校准精确的相位步长。与传统方法相比，所提出的算法对高度相关效应不敏感，而高度相关效应是从条纹图案重建表面时相移阴影莫尔条纹中主要的系统误差源。数值模拟和光学实验表明，所提出的方法可以消除不均匀相移误差，并且比现有的典型相移算法具有更优越的性能。
