Comparison of stereo vs 2D digital image correlation for wavefield reconstruction for damage imaging

T. Bryce Abbott; Fuh-Gwo Yuan

doi:10.1117/12.2613487

18 April 2022 Comparison of stereo vs 2D digital image correlation for wavefield reconstruction for damage imaging

T. Bryce Abbott, Fuh-Gwo Yuan

Proceedings Volume 12046, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2022; 120460H (2022) https://doi.org/10.1117/12.2613487
Event: SPIE Smart Structures + Nondestructive Evaluation, 2022, Long Beach, California, United States

Abstract

This paper presents a feasibility study for the visualization of hidden damage using an integrated highspeed stereo-camera system. The reconstructed wavefields produced by the 3D-enabled stereo-camera system were compared to those from a single-camera system, which is limited to 2D sampling. To demonstrate this stereo-camera concept, guided waves were generated in a thin aluminum plate with surrogate damage using a surface-mounted piezoelectric actuator under continuous sinusoidal excitation. The resulting wavefield was captured with two calibrated high-speed cameras and reconstructed through stereo-digital image correlation. After signal or image filtering and processing, the reconstructed wavefield was produced. To overcome the limited data rate of state-of-the-art high-speed cameras, sample interleaving was implemented to effectively increase the sampling rate. For the single-camera 2D-DIC case, image stitching was needed to increase the field of view, which left artifacts in the damage image due to slight misalignments between samples. The implementation of two high-speed cameras for stereo-digital image correlation enables the full-field sampling of both in-plane and out-of-plane components of the wavefield displacement. Because the out-of-plane displacement is typically much larger than other wave modes due to the thin plate dimensions, this advantage of capturing out-of-plane vibrations unique to the stereo-camera setup lowered the required resolution and enabled the capture of a larger field-of-view without the need for image stitching.

Conference Presentation

Citation Download Citation

T. Bryce Abbott and Fuh-Gwo Yuan "Comparison of stereo vs 2D digital image correlation for wavefield reconstruction for damage imaging", Proc. SPIE 12046, Sensors and Smart Structures Technologies for Civil, Mechanical, and Aerospace Systems 2022, 120460H (18 April 2022); https://doi.org/10.1117/12.2613487

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