Hung Y Y, Liang C Y
Appl Opt. 1979 Apr 1;18(7):1046-51. doi: 10.1364/AO.18.001046.
This paper describes a new image-shearing camera which focuses two laterally sheared images at the film plane. With coherent illumination, this camera becomes a shearing interferometer, which directly measures the derivatives of the surface displacements. This strain measuring tool enjoys several advantages over the conventional, holographic, and speckle interferometry, namely, (1) better fringe quality (than speckle interferometry); (2) does not require special vibration isolation; (3) very simple optical setup; (4) direct determination of strains; and (5) extended controllable range of sensitivity.
本文介绍了一种新型的图像剪切相机，它能在胶片平面上聚焦两个横向剪切的图像。在相干照明条件下，该相机成为一台剪切干涉仪，可直接测量表面位移的导数。与传统干涉测量法、全息干涉测量法和散斑干涉测量法相比，这种应变测量工具具有以下几个优点：（1）条纹质量更好（优于散斑干涉测量法）；（2）不需要特殊的隔振措施；（3）光学设置非常简单；（4）可直接测定应变；（5）灵敏度的可控范围更大。
