Dynamic Displacements Measurement Employing Fringe Projection and Digital Image Correlation

Abstract

A combination of Fringe Projection (FP) and 2D Digital Image Correlation (2D DIC) using a single camera has been employed to simultaneously measure in-plane and out-of-plane displacements during different dynamic events such an impact and a vibration analysis. This approach has been adopted in the past by several authors, including Mares et al. who highlighted that if a telecentric lens are not employed the combination of both techniques is not straightforward since the in-plane displacements measured with 2D DIC are sensitive to the out-of-plane displacements. Thus, in-plane displacements measured using 2D DIC should be corrected using the out-of-plane displacements inferred using the FP technique. In the current work, an easy method for in-plane displacement correction using Fringe Projection is adopted when measuring the 3D displacements during an impact on an aluminum plate and the vibration of a composite component which have not been studied by other authors previously.

A Digital Image Correlation Technique for Laboratory Structural Tests and Applications: A Systematic Literature Review

“…The camera hardware boosting not only helped to utilize the DIC testing of large specimens but also assisted in expanding the usage of the technique for various static and dynamic tests. For example, the progressively increasing camera frame rates enabled the use of the DIC for dynamic applications, such as the determination of the structureʹs natural frequency, seismic response, vibration measurements, and impact tests [16][17][18][19][20][21][22][23][24][25]. In addition, camera portability, achieved through the use of devices such as smartphone cameras, has opened new venues for DIC applications in civil engineering and other fields [26][27][28][29][30][31][32].…”

Development of a new dual‐pattern fringe projection scanner

“…Felipe‐Sesé et al. () used a digital image‐correlation technique to calculate large in‐plane displacements of a fringe scanner. An interesting solution offered by a few researchers is to manipulate the fringe pattern itself.…”