Abstract

The possibility of determining deformations of large-sized objects by structured illumination is considered. The method is based on projection of sinusoidal fringe patterns on the surface of the object under study. Using the step-by-step phase shift allows one to distinguish information about the phase distribution reflecting the surface relief. Comparison of phase distributions before and after the action on the object makes it possible to establish the deformation field. A new method of finding phase differences is presented; it considerably reduces demands to phase ambiguity elimination algorithms. An experimental facility for the determination of ultimate sensitivity of the method when investigating deformations of a clamped cantilever beam is developed. It is shown that the sensitivity of the method is less than 10 \(\mu\)m at the free end of the beam.

中文翻译：

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基于结构照明的大物体变形非接触测量方法

摘要

考虑了通过结构化照明确定大型物体变形的可能性。该方法基于正弦条纹图案在研究对象表面上的投影。使用逐步相移可以使人们区分有关反映表面起伏的相分布的信息。比较作用在物体上之前和之后的相位分布，可以建立变形场。提出了一种寻找相位差的新方法。它大大减少了对相位模糊消除算法的需求。开发了一种用于确定在研究悬臂梁变形时方法的极限灵敏度的实验设备。结果表明，该方法的灵敏度小于10在光束的自由端\（\ mu \） m。