Three-dimensional Displacement and Shape Measurement with a Diffraction-assisted Grid Method

摘要: The grid method is a full-field optical technique for computing surface displacements and strains of material by analyzing the phase lines patterned on specimen. To date, most experiments using have measured only two-dimensional in-plane deformations. Here, extended to three dimensions crossed pattern diffraction grating which enables acquiring images from multiple viewing angles single camera. In-plane are computed conventional method, corresponding three-dimensional (3D) displacements—including out-of-plane or shapes—are collected at different angles. demonstrated measuring 3D rigid body motion, membrane in pressure-bulge experiment, curvature cylindrical