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Measurement of three-dimensional deformations using digital holography with radial sensitivity

机译：使用具有径向灵敏度的数字全息术测量三维变形

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摘要

A measurement system based on digital holography for the simultaneous measurement of out-of-plane and radial in-plane displacement fields for the assessment of residual stress is presented. Two holograms are recorded at the same time with a single image taken by a digital camera, allowing the separate evaluation of in-plane and out-of-plane movement. An axis-symmetrical diffractive optical element is used for the illumination of the object, which causes radial sensitivity vectors. By the addition and, respectively, the subtraction, of the four phase maps calculated from two camera frames, the in-plane and out-of-plane deformation of an object can be calculated separately. The device presented is suitable for high-speed, high-resolution measurement of residual stress. In addition to the setup, first measurement results and a short comparison to a mature digital speckle pattern interferometry setup are shown.
机译：提出了一种基于数字全息的测量系统，用于同时测量平面外和径向平面内的位移场，以评估残余应力。用数码相机拍摄的单个图像同时记录两个全息图，从而可以分别评估平面内和平面外运动。轴对称衍射光学元件用于物体的照明，这会引起径向灵敏度矢量。通过从两个摄像机帧计算出的四个相位图的相加和相减，可以分别计算对象的平面内和平面外变形。所提供的设备适用于高速，高分辨率的残余应力测量。除了设置之外，还显示了第一测量结果以及与成熟的数字散斑图案干涉测量设置的简短比较。

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