Hu C P, Turner J L, Taylor C E
Appl Opt. 1976 Jun 1;15(6):1558-64. doi: 10.1364/AO.15.001558.
A technique producing an optical effect that is unaffected by rigid body motion is described. It is shown that the resulting interference fringe pattern is proportional to the change in model thickness, which for the case of plane stress is proportional to the sum of the principal stresses, and thus provides a full field isopachic fringe pattern. This method combines holographic interferometry and the moiré effect. Double exposure holograms are made from both sides of a model before and after deformation. The two sets of holographic interferometric fringes thus obtained are treated as random grids, and the superposition of these two grids produces a moiré effect that is free from the effects due to rigid body motion. The theory is experimentally confirmed with several examples, and limitations of the techniques are also discussed.
本文描述了一种产生不受刚体运动影响的光学效应的技术。结果表明，所产生的干涉条纹图案与模型厚度的变化成正比，在平面应力情况下，该变化与主应力之和成正比，从而提供了全场等厚条纹图案。该方法结合了全息干涉测量法和莫尔效应。在模型变形前后，从其两侧制作双曝光全息图。将由此获得的两组全息干涉条纹视为随机栅格，这两组栅格的叠加产生了不受刚体运动影响的莫尔效应。通过几个例子对该理论进行了实验验证，并讨论了该技术的局限性。
