An efficient PDE-constrained stochastic inverse algorithm for probabilistic geotechnical site characterization using geophysical measurements

Parida, Siddharth S.; Sett, Kallol; Singla, Puneet

doi:10.1016/j.soildyn.2018.01.030

Cited by 11 publications

(1 citation statement)

References 36 publications

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“…These images reveal existing internal structural elements as well as internal defects. SAFT is typically considered to be faster, more flexible, and easier to interpret than other imaging techniques such as full-waveform inversion [6] [7], stochastic model data fusion [8], or reverse time migration [9] [10]. On the other hand, a major shortcoming of SAFT is poor performance related to imaging steeply inclined interfaces and the bottom boundaries of tubes, voids, rebars or tendon ducts [9] [10].…”

Section: Introductionmentioning

confidence: 99%

Ray-based SAFT for imaging concrete structures from ultrasonic data

Dinh¹,

Tran

Brown³

et al. 2023

Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XVII

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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.

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