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Synchronous triple-optical-path digital speckle pattern interferometry with fast discrete curvelet transform for measuring three-dimensional displacements

机译:快速离散curvelet变换的同步三光路数字散斑干涉测量法,用于测量三维位移

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摘要

Digital speckle pattern interferometry (DSPI) is a well-established and widely used optical measurement technique for obtaining qualitative as well as quantitative measurements of objects deformation. The simultaneous measurement of an object's surface displacements in three dimensions using DSPI is of great interest. This paper presents a triple-optical-path DSPI based method for the simultaneous and independent measurement of three-dimensional (3D) displacement fields. In the proposed method, in plane speckle interferometers with dual-observation geometry and an out-of-plane interferometer are optimally combined to construct an integrated triple-optical-path DSPI system employing the phase shift technique, which uses only a single laser source and three cameras. These cameras are placed along a single line to synchronously capture real-time visible speckle fringe patterns in three dimensions. In addition, a pre-filtering method based on the fast discrete curvelet transform (FDCT) is utilized for de-noising the obtained wrapped phase patterns to improve measurement accuracy. Finally, the simultaneous measurement of the 3D displacement fields of a simple beam and a composite laminated plate respectively subjected to three-point and single-point bend loading are investigated to validate the feasibility and effectiveness of the proposed method. (C) 2015 Elsevier Ltd. All rights reserved.
机译:数字散斑图案干涉术(DSPI)是一种建立完善且广泛使用的光学测量技术,可用于对物体变形进行定性和定量测量。使用DSPI在三个维度上同时测量对象的表面位移引起了人们的极大兴趣。本文提出了一种基于三光路DSPI的方法,用于同时独立测量三维(3D)位移场。在所提出的方法中,具有双观测几何形状的面内散斑干涉仪和面外干涉仪被最佳地组合在一起,从而构建了一个采用相移技术的集成三光路DSPI系统,该系统仅使用单个激光源,并且三个相机。这些摄像机沿着单条线放置,以同步捕获三维的实时可见斑点条纹图案。另外,基于快速离散曲波变换(FDCT)的预滤波方法被用于对获得的包裹相位模式进行去噪以提高测量精度。最后,研究了同时测量分别承受三点和单点弯曲载荷的简单梁和复合叠层板的3D位移场,以验证该方法的可行性和有效性。 (C)2015 Elsevier Ltd.保留所有权利。

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