Ahmadi Mohammad, Madanipour Khosro
Appl Opt. 2016 Dec 20;55(36):10370-10374. doi: 10.1364/AO.55.010370.
In a deflectometry experiment for finding the temperature distribution around a hot wire as a phase object, the trace of the wire in a moiré pattern is duplicated, and it is observed that the separation of the wire traces varies when the distance between two gratings of a moiré deflectometry setup is changed. By investigation of moiré deflectometry, it is found that the object trace duplication cannot be interpreted by ray deflection theory, which is based on geometric optics. By using diffraction theory, the effect of a phase object on a moiré pattern is studied, and some generalized formulations are presented. It is demonstrated that the deformation of moiré fringes does not originate from the wavefront derivative, but superposition of two separated wavefronts causes fringe deformation. By this approach, the accuracy of ray deflection analysis is improved. Finally, the results of this model are simulated, and the simulation has good agreement with the experimental model.
在用于将热线周围的温度分布作为相位物体进行测量的偏折测量实验中，热线在莫尔条纹图案中的轨迹会出现重复，并且观察到当莫尔偏折测量装置的两个光栅之间的距离改变时，热线轨迹的间距会发生变化。通过对莫尔偏折测量的研究发现，物体轨迹重复现象无法用基于几何光学的光线偏折理论来解释。利用衍射理论，研究了相位物体对莫尔条纹图案的影响，并给出了一些广义公式。结果表明，莫尔条纹的变形并非源于波前导数，而是两个分离波前的叠加导致了条纹变形。通过这种方法，提高了光线偏折分析的精度。最后，对该模型的结果进行了模拟，模拟结果与实验模型吻合良好。
