We have numerically simulated the process of measuring stress – strain states by the method of speckle-shearing interferometry using the phase-shift technique. A computer model with the possibility of setting its strain and roughness is developed, which includes a model of a diffusely reflecting test object corresponding to the characteristics of a real membrane, as well as a speckle interferometer model that allows speckle interferograms to be obtained for different speckle sizes and angles between interfering beams. The process of reconstructing the object surface topogram from model speckle interferograms by the phase-shift technique is implemented. Using the developed models, a two-dimensional shearogram are obtained, which is a derivative of the strain field of a circular membrane. Comparison of the results of numerical simulation with experimental data shows that the differences (rms deviations) do not exceed 0.02 μm. It is also shown that the error of interferogram reconstru...

中文翻译：

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相移斑点剪切干涉法

我们使用相移技术，通过斑点剪切干涉法，对应力-应变状态的测量过程进行了数值模拟。开发了一种可以设置其应变和粗糙度的计算机模型，该模型包括与真实膜的特性相对应的漫反射测试对象的模型，以及可以获取不同斑点斑点干涉图的斑点干涉仪模型。斑点大小和干涉光束之间的角度。实现了通过相移技术从模型散斑干涉图中重建物体表面形貌的过程。使用开发的模型，获得了二维剪切图，它是圆形膜应变场的导数。数值模拟结果与实验数据的比较表明，差异（均方根偏差）不超过0.02μm。还表明干涉图重建的误差...