Article
Engineering, Mechanical
Kaipeng Ji, Peng Zhao, Chaojie Zhuo, Haoran Jin, Mu Chen, Jian Chen, Sheng Ye, Jianzhong Fu
Summary: This paper proposes an efficient phase shift migration method for ultrasonic full-matrix imaging of multilayer structures. By treating FMC as data in three dimensions and transforming it into frequency-wavenumber (f-k) space using a three-dimensional fast Fourier transform, the method can reconstruct wavefields at arbitrary depths and produce defect images. The proposed method has low computational complexity and is six times faster than existing methods.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Engineering, Mechanical
Kaipeng Ji, Peng Zhao, Chaojie Zhuo, Haoran Jin, Libin Zhang, Xiaolong Jiao, Jianzhong Fu
Summary: This paper proposes two absorbing boundary conditions for wave field extrapolation in phase shift migration (PSM) imaging. These boundary conditions, implemented in the frequency-space domain and frequency-wavenumber domain, effectively suppress artifact reflections and improve imaging quality. Experimental results demonstrate that the proposed boundary conditions significantly enhance imaging results and perform well in imaging heterogeneous medium.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2023)
Article
Engineering, Mechanical
Kaipeng Ji, Peng Zhao, Chaojie Zhuo, Jian Chen, Xianghong Wang, Shiquan Gao, Jianzhong Fu
Summary: In this paper, an ultrasonic imaging method based on frequency-domain reverse-time migration (FD-RTM) was developed for defect detection in curved-surface components (CSC). The method showed high-quality imaging and obvious advantages compared to existing methods.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2022)
Article
Materials Science, Multidisciplinary
Xufei Guo, Yan Han
Summary: The proposed root-mean-square velocity algorithm for total focusing imaging of multilayer structures accurately calculates the ultrasonic propagation path and time, thus improving imaging efficiency in multilayer composite structures.
ADVANCES IN MATERIALS SCIENCE AND ENGINEERING
(2021)
Article
Engineering, Mechanical
Santhakumar Sampath, R. Dhayalan, Anish Kumar, N. N. Kishore, Hoon Sohn
Summary: This paper introduces a new method using PAUT with FMC to measure acoustic properties and evaluate material degradation. Experimental results show that this method is more accurate than the conventional CUT technique, making it suitable for assessing material degradation.
ENGINEERING FAILURE ANALYSIS
(2021)
Article
Acoustics
Qian Xu, Haitao Wang, Guiyun Tian, Xiangdong Ma, Binding Hu, Jianbo Chu
Summary: The Phased Array Ultrasonic Technique (PAUT) with Full Matrix Capture (FMC) is advantageous for high imaging accuracy and defect characterization in nondestructive testing of welded structures. In order to address the large amount of data in nozzle weld defect monitoring, a PAUT with FMC data compression method based on compressive sensing (CS) was proposed. The study compared the reconstruction performance of the greedy theory-based orthogonal matching pursuit (OMP) algorithm and the convex optimization theory-based basis pursuit (BP), and also explored an alternative sensing matrix construction using empirical mode decomposition (EMD)-based intrinsic mode function (IMF) circular matrix.
Article
Polymer Science
James A. Quinn, James R. Davidson, Ankur Bajpai, Conchur M. O. Bradaigh, Edward D. McCarthy
Summary: This investigation focuses on the inspection capabilities of in-field advanced ultrasound detection for ultra-thick glass fibre-reinforced polyester composites. Delamination flaws were created at calibrated depths using custom moulding techniques. The study utilized the full matrix capture technique with an on-board total focusing method and a 0.5 MHz linear array probe to detect flaws. The results demonstrate an inverse relationship between the ability to find delaminations and plate thicknesses, with successful inspections up to 74 mm.
Article
Instruments & Instrumentation
C. Hoyle, M. Sutcliffe, P. Charlton, S. Mosey, I Cooper
Summary: Through-transmission ultrasonic inspection is limited in obtaining defect depth information, but a novel approach based on back-projection can improve image resolution and defect detectability. Two transducers are used to capture data for image processing, with various algorithms explored to enhance image focus.
Article
Engineering, Electrical & Electronic
Ali Mehrdadian, Keyvan Forooraghi, Keyhan Hosseini
Summary: This article extends the method of lines (MoL) to analyze 2-D multilayer structures loaded with graphene plates in cylindrical coordinates. The admittance transformation matrices on all the planes of the multilayer structure are derived taking into account the tensor-form conductivity of the magnetized graphene plate. A technique to obtain the characteristic equation and propagation constant of the structure is proposed by matching the fields at the interfaces loaded with graphene. The proposed method is validated by comparing the results with COMSOL simulations and has potential applications in tunable microwave attenuators and phase shifters.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Engineering, Mechanical
Haoran Jin, Jian Chen
Summary: An efficient wavenumber algorithm for ultrasonic full-matrix imaging of multi-layered medium is proposed in this paper, utilizing wavefield extrapolation and Stolt interpolation to reconstruct images of each layer, reducing computational burden and demonstrating better imaging quality and efficiency in simulations and experiments.
MECHANICAL SYSTEMS AND SIGNAL PROCESSING
(2021)
Article
Chemistry, Analytical
Xiangting Xu, Zhichao Fan, Xuedong Chen, Jingwei Cheng, Yangguang Bu
Summary: The study explores the characteristics of acoustic waves propagating in different directions in composite materials using ultrasonic phased array and full matrix capture (FMC) data. An improved focal law is derived based on the elastic constants of multidirectional carbon fiber reinforced plastic (CFRP) laminate obtained through the genetic algorithm. The imaging results using the optimized total focusing method (TFM) show reduced background noise and improved defect characterization. Additionally, a linear extrapolation method is proposed to estimate the velocity profile at higher angles, which is advantageous for engineering practices compared to theoretically correcting angle-dependent velocity.
Article
Acoustics
Yujian Mei, Jian Chen, Yike Zeng, Lu Wu, Zheng Fan
Summary: Phased array-based full-matrix ultrasonic imaging is the golden standard for non-destructive evaluation of critical components, but it has limitations in hazardous environments. This study demonstrated the laser-induced full-matrix ultrasonic imaging of complex defects using a couplant-free approach. The proposed method overcame existing challenges through full matrix data acquisition and deep learning.
Article
Acoustics
Kaipeng Ji, Peng Zhao, Chaojie Zhuo, Mu Chen, Jian Chen, Haoran Jin, Sheng Ye, Jianzhong Fu
Summary: This paper introduces a method to autofocus imaging of internal voids in multilayer polymer composite structures with ultrasonic phased array. The method processes the full matrix capture data, evaluates focusing quality using focus criterions, and estimates sound speed layer by layer from surface to deep. The method successfully focused all voids in simulation and experimental data.
Article
Engineering, Electrical & Electronic
Yun Xie, Lujing Zhou, Xiaobin Zhang, Jinhu Wu, Jiaming Dou
Summary: The paper proposes a phase coherence factor (TF-PCF) weighted full-focus imaging method based on threshold fusion to solve the problem of low imaging resolution and interference in quantitative analysis of defect size. The algorithm effectively eliminates noise information and reduces quantization errors, improving the reliability of defect size analysis.
JOURNAL OF SENSORS
(2022)
Article
Chemistry, Analytical
Chirag Anand, Roger M. Groves, Rinze Benedictus
Summary: This paper proposes a novel model based on the Gaussian-based recursive stiffness matrix approach to simulate the scattering from defects embedded in anisotropic layered medium. The model combines transfer matrix and stiffness matrix methods, is modular, computationally inexpensive, and shows good agreement with experimentally determined signals. The proposed method provides insights on the effects of various parameters on the scattering of defects in layered anisotropic medium.