Seismic wavefield imaging of Earth's interior across scales

J Tromp - Nature Reviews Earth & Environment, 2020 - nature.com
Seismic full-waveform inversion (FWI) for imaging Earth's interior was introduced in the late
1970s. Its ultimate goal is to use all of the information in a seismogram to understand the …

Guided ultrasonic waves propagation imaging: a review

CC Chia, SY Lee, MY Harmin, Y Choi… - Measurement Science …, 2023 - iopscience.iop.org
This article presents a comprehensive review of the laser-based guided ultrasonic waves
propagation imaging (G-UPI) system and respective signal/data processing methods related …

Deep learning inversion with supervision: A rapid and cascaded imaging technique

J Tong, M Lin, X Wang, J Li, J Ren, L Liang, Y Liu - Ultrasonics, 2022 - Elsevier
Abstract Machine learning has been demonstrated to be extremely promising in solving
inverse problems, but deep learning algorithms require enormous training samples to obtain …

A softmax classifier for high-precision classification of ultrasonic similar signals

F Gao, B Li, L Chen, Z Shang, X Wei, C He - Ultrasonics, 2021 - Elsevier
High precision classification of ultrasonic signals is helpful to improve the identification and
evaluation accuracy for detecting defects. In the previous research, the deep neural network …

Detection of delamination and rebar debonding in concrete structures with ultrasonic SH-waveform tomography

R Chen, KT Tran, HM La, T Rawlinson, K Dinh - Automation in Construction, 2022 - Elsevier
The detection of delamination and rebar debonding is among the most frequently
encountered issues for inspecting concrete for quality control and assurance. This paper …

Improving the sensitivity of the mechanoluminescence composite through functionalization for structural health monitoring

H Song, S Timilsina, J Jung, TS Kim… - ACS Applied Materials & …, 2022 - ACS Publications
Over the past few years, considerable effort has been directed toward the development and
improvement of mechanoluminescence (ML)-based stress sensing as an efficient …

Detection and characterisation of defects in directed energy deposited multi-material components using full waveform inversion and reverse time migration

J Rao, SL Sing, JCW Lim, WY Yeong… - Virtual and Physical …, 2022 - Taylor & Francis
Directed energy deposition (DED) is capable in producing complex or high-value
components with good mechanical properties. Despite these potential advantages, the …

Diffuse ultrasonic wave-based structural health monitoring for railway turnouts

K Wang, W Cao, L Xu, X Yang, Z Su, X Zhang, L Chen - Ultrasonics, 2020 - Elsevier
Real-time damage evaluation is a critical step to warrant the integrity of turnout systems in
railway industry. Nevertheless, existing structural health monitoring (SHM) approaches …

Point cloud-based elastic reverse time migration for ultrasonic imaging of components with vertical surfaces

J Rao, J Wang, S Kollmannsberger, J Shi, H Fu… - … Systems and Signal …, 2022 - Elsevier
This work presents a new ultrasonic imaging framework for non-destructive evaluation of
components with vertical or steeply dipping surfaces and demonstrates its ability of …

SeisFlows—Flexible waveform inversion software

RT Modrak, D Borisov, M Lefebvre, J Tromp - Computers & geosciences, 2018 - Elsevier
SeisFlows is an open source Python package that provides a customizable waveform
inversion workflow and framework for research in oil and gas exploration, earthquake …