Ray-based SAFT for imaging concrete structures from ultrasonic data

Kien Dinh; Khiem Tran; Jeff Brown; Christopher C. Ferraro; Siddharth Parida

doi:10.1117/12.2659061

18 April 2023 Ray-based SAFT for imaging concrete structures from ultrasonic data

Kien Dinh, Khiem Tran, Jeff Brown, Christopher C. Ferraro, Siddharth Parida

Proceedings Volume 12487, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVII; 1248708 (2023) https://doi.org/10.1117/12.2659061
Event: SPIE Smart Structures + Nondestructive Evaluation, 2023, Long Beach, California, United States

Abstract

Synthetic aperture focusing technique (SAFT) is one of the most-used ultrasonic imaging algorithms. However, by considering only the direct sound path (i.e., pulse-echo signals) for image reconstruction, this technique is unable to show steeply inclined interfaces and bottom boundaries of objects in concrete structures. To address this problem, the current study considered various sound paths when applying SAFT for concrete elements. The proposed hypothesis is that different sound paths will provide access and imaging opportunities to previously inaccessible areas of the inspected volume/region. As a proof of concept, the proposed method, namely the ray-based SAFT, was tested with ultrasonic shear wave data for two concrete slab specimens. The results indicated a significant improvement compared to conventional SAFT imaging for simulated rebar debonding, vertical boundaries of slabs, and bottoms/sides of tendon ducts.

Citation Download Citation

Kien Dinh, Khiem Tran, Jeff Brown, Christopher C. Ferraro, and Siddharth Parida "Ray-based SAFT for imaging concrete structures from ultrasonic data", Proc. SPIE 12487, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVII, 1248708 (18 April 2023); https://doi.org/10.1117/12.2659061

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