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Integrating fringe projection and digital image correlation for high-quality measurements of shape changes

机译：集成条纹投影和数字图像相关性，以进行形状变化的高质量测量

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摘要

An approach for the measurement of surface displacement fields in three dimensions is presented based on the combination of two-dimensional digital image correlation with fringe projection. Only a single RGB image is required at each deformation state, thereby allowing real-time data acquisition, which is achieved using red speckle and projected blue fringes that are captured in the single image and separated using a Bayer filter. The approach allows both a perpendicular alignment relative to a flat reference surface and self-calibration, i.e., no calibration object is employed. The minimum measurement uncertainty of such a system is found to be 0.0083 ± 0.00239 and 0.0238 ± 0.0068 mm, respectively, for the in-plane and out-of-plane displacements. The potential of the approach is demonstrated for an elastic membrane undergoing large (5 to 20 mm) applied out-of-plane displacements, and the results show no significant difference (<1%) in the measured in-plane displacement fields compared with a commercially available system for stereoscopic digital image correlation.
机译：提出了一种基于二维数字图像相关性与条纹投影相结合的三维表面位移场的测量方法。在每个变形状态仅需要单个RGB图像，从而可以进行实时数据采集，这是使用在单个图像中捕获并使用拜耳过滤器分离的红色斑点和投影蓝色条纹实现的。该方法既允许相对于平坦基准表面的垂直对准又可以进行自校准，即不使用校准对象。发现这种系统的平面内和平面外位移的最小测量不确定度分别为0.0083±0.00239和0.0238±0.0068 mm。证明了该方法对于弹性膜承受较大（5至20 mm）施加的平面外位移的潜力，结果表明，所测量的平面位移场与弹性膜相比没有显着差异（<1％）。用于立体数字图像相关的市售系统。

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