Pryputniewicz R, Stetson K A
Appl Opt. 1976 Mar 1;15(3):725-8. doi: 10.1364/AO.15.000725.
A method has been published recently that permits determination of complete strain and rotation tensors of homogeneously deformed objects directly from fringes that are observed on their surfaces. However, the illumination and observation directions had to be considered constant over the regions of interest to apply the technique. This paper presents an extension of that theory to include both observation and illumination perspectives. It is shown that bulk translations of an object combine with linear variations in the directions of observation and illumination to generate fringe vectors that add directly to those generated by the object's homogeneous transformations. These linear variations are calculable from illumination and observation geometry.
最近发表了一种方法，该方法允许直接从在均匀变形物体表面观察到的条纹确定其完整的应变张量和旋转张量。然而，为了应用该技术，在感兴趣的区域上照明和观察方向必须被视为恒定的。本文提出了该理论的一种扩展，以包括观察和照明视角。结果表明，物体的整体平移与观察和照明方向的线性变化相结合，产生的条纹向量可直接与由物体均匀变换产生的条纹向量相加。这些线性变化可根据照明和观察几何结构计算得出。
