Article
Materials Science, Characterization & Testing
Vladimir Vavilov, Arsenii Chulkov, Stanislav Dubinskii, Douglas Burleigh, Victor Shpilnoi, Daria Derusova, Vadim Zhvyrblia
Summary: This study utilized multiple thermal NDT methods to inspect CFRP T-joints, with the results showing that two-sided TNDT was able to detect simulated defects throughout the entire material thickness, while the detection capability of one-sided TNDT depended on the depth and size of the defects. Furthermore, ultrasonic infrared thermography and laser vibrometry were not effective in detecting the implants.
Article
Materials Science, Multidisciplinary
Vinay Damodaran, Anna G. Hahm, Pavana Prabhakar
Summary: The paper proposes a novel design and fabrication strategy for producing architected structures as the core in composite sandwich structures, which can dissipate energy and exhibit structural recovery. The mechanical response and design parameters relationship of conical unit cells are investigated, showing that the structures with curved sidewalls can dissipate energy and recover from deformation. The study demonstrates that the buckling strength and post-buckling stability of these structures are influenced by geometric parameters, providing insights for their applications in engineering materials.
MATERIALS & DESIGN
(2021)
Article
Engineering, Electrical & Electronic
Niklas Wingren, Daniel Sjoberg
Summary: Nondestructive testing (NDT) is important for composite materials in aerospace applications, and millimeter-wave (mm-wave) imaging is increasingly used. This paper presents an mm-wave imaging method with an inverse approach for NDT of singly curved composite panels. The method generates high-resolution images with less background clutter compared to traditional Fourier imaging methods.
IEEE TRANSACTIONS ON ANTENNAS AND PROPAGATION
(2023)
Article
Construction & Building Technology
Xuelei Jiang, Ying Xu, Dechun Zhao
Summary: Corrosion reduces the bearing capacity and durability of steel plate structures. Existing non-destructive testing methods have limitations in accurately assessing the corrosion of steel plates in terms of location, area, and thickness. This paper proposes a method of using reflected terahertz (THz) signals to detect and image corrosion in coated steel plates. Results from experiments and numerical modeling demonstrate the high measurement precision of this THz method, allowing for simultaneous measurement of coating and corrosion layer thickness. A novel imaging technique using THz is also developed to visualize the corrosion thickness of steel plates, providing characteristic values such as maximum, minimum, average, median, and standard deviation. In conclusion, the proposed THz technology enables non-destructive testing of corrosion area, shape, and thickness, serving as a guide to quantify the degree of corrosion in steel plate structures.
CONSTRUCTION AND BUILDING MATERIALS
(2023)
Article
Automation & Control Systems
Weixiang Du, Haochen Liu, Yitian Zhao, Adisorn Sirikham, Sri Addepalli, Yifan Zhao
Summary: This article introduces a miniaturized active thermography system for assessing defects in composite laminates. The system features a small size, low resolution, and low cost thermal sensor, and integrates two optional excitation sources. Dedicated data analysis approaches are proposed to effectively evaluate different types of defects.
IEEE TRANSACTIONS ON INDUSTRIAL INFORMATICS
(2021)
Article
Engineering, Electrical & Electronic
Min Zhai, D. S. Citrin, Alexandre Locquet
Summary: Terahertz time-of-flight tomography (TOFT) faces challenges in characterizing samples with both micron-scale and millimeter-scale layers, due to obscured echoes and mistaken overlapping echoes from thin layers. A sparse-deconvolution (SD) technique demonstrated in this paper overcomes these challenges, successfully extracting impulse responses of samples with thick and thin layers, providing a clearer and more accurate reconstruction.
JOURNAL OF INFRARED MILLIMETER AND TERAHERTZ WAVES
(2021)
Review
Materials Science, Multidisciplinary
Teng Wei Siang, Muhammad Firdaus Akbar, Ghassan Nihad Jawad, Tan Shin Yee, Mohd Ilyas Sobirin Mohd Sazali
Summary: This paper reviews the limitations of traditional nondestructive testing techniques in inspecting composite coatings, describes the emergence of microwave NDT techniques to compensate for the shortcomings, and discusses how modern technologies such as artificial intelligence methods enhance the reliability and accuracy of microwave NDT techniques.
Article
Materials Science, Characterization & Testing
Lae-Hyong Kang, Dae-Hyun Han
Summary: This study experimentally investigated the detection and localization of damage in a PVC pipe cap using pulsed terahertz technology and a six-DOF robotic arm. The focus was on developing a 3D imaging system to monitor thickness and detect defects in 3D structures. The analysis of reflected signals in the time and frequency domains allowed for the detection and visualization of various types of defects in the simulated PVC pipe cap.
NDT & E INTERNATIONAL
(2021)
Article
Chemistry, Physical
Pawel Karol Frankowski, Tomasz Chady
Summary: This work investigates the impact of magnetization methods on the parameters of the magnetic method and the evaluation of reinforced concrete structures. The results demonstrate that the proper selection of magnetization method can improve noise reduction, signal strength, and separation of measurements on different samples. Magnetization can also affect the shape, waveform deformations, area testing, and increase the efficiency of simultaneous evaluation of three basic parameters of RC structures.
Article
Engineering, Electrical & Electronic
Shushan Wang, Hongwei Mei, Jianjun Liu, Dabing Chen, Liming Wang
Summary: This article proposes a THz 2-D imaging framework based on clustering analysis methods, which can effectively perform nondestructive testing on various materials. Experimental results show that the framework can clearly image physical structures of samples and accurately distinguish different areas.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Article
Engineering, Electrical & Electronic
Zhiyi He, Hongjin Wang, Yiwen Li, Zhenjun Zhang, Yudong Zhang, Hanbo Bi, Yunze He
Summary: A deconvolutional reconstruction method based on the LR algorithm was developed, effectively suppressing random noise and blur effect caused by thermal diffusion. The proposed LR method exhibited a higher signal-to-noise ratio and successfully detected defects with a diameter of 1.5 mm and a depth of 2.0 mm.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2021)
Article
Materials Science, Multidisciplinary
In-Yong Lee, Hyung Doh Roh, Young -Bin Park
Summary: This study proposes a method for real-time prognosis and health management using electromechanical behavior data obtained from CFRP structures under repeated impact testing. The types of failure observed during impact testing are investigated using real-time self-sensing data. A particle filter is used for predicting the electromechanical behavior and the remaining number of useful impacts during repeated impact testing. The proposed methodology was successfully applied to monitor and predict impact damage growth on a wind-turbine blade with a 5% prediction error.
MATERIALS & DESIGN
(2022)
Article
Chemistry, Physical
Pawel Karol Frankowski, Tomasz Chady
Summary: This paper presents the method of multisensory spatial analysis (MSA) for quick and simultaneous identification of concrete cover thickness, rebar diameter, and alloys of reinforcement in large areas of reinforced concrete structures. The method divides the complex problem into three simple tasks based on separate premises, and achieves high accuracy in real-time area testing.
Article
Engineering, Electrical & Electronic
Alessandro Sardellitti, Filippo Milano, Marco Laracca, Salvatore Ventre, Luigi Ferrigno, Antonello Tamburrino
Summary: Thickness measurements of metallic plates are mandatory in many industrial scenarios. Eddy-current testing (ECT) methods are attractive for online contactless thickness measurements. However, the current ECT technique has limitations in measuring thicker materials. In this article, we analyze the theoretical foundation of the method and propose two solutions to accurately estimate the thickness of materials. Numerical analysis and experiments confirm the effectiveness of the proposed solutions, making the method suitable for industrial and other applications.
IEEE TRANSACTIONS ON INSTRUMENTATION AND MEASUREMENT
(2023)
Review
Acoustics
Alireza Zarei, Srikanth Pilla
Summary: This paper provides a comprehensive overview of Laser Ultrasonic Testing (LUT) and its applications in composite materials. LUT is a noncontact and nondestructive technique that utilizes lasers to generate and detect ultrasonic waves. Despite challenges such as low signal-to-noise ratio and complex damage patterns in composite materials, LUT shows promise for implementation in Smart Industries and harsh industrial environments.
Article
Chemistry, Analytical
Przemyslaw Lopato, Michal Herbko
Article
Materials Science, Characterization & Testing
Iman Taraghi, Przemyslaw Lopato, Sandra Paszkiewicz, Abdolhossein Fereidoon
Article
Computer Science, Interdisciplinary Applications
Michal Herbko, Przemyslaw Lopato
INTERNATIONAL JOURNAL OF RF AND MICROWAVE COMPUTER-AIDED ENGINEERING
(2019)
Article
Chemistry, Analytical
Michal Herbko, Przemyslaw Lopato
Article
Materials Science, Characterization & Testing
Iman Taraghi, Przemyslaw Lopato, Sandra Paszkiewicz, Elzbieta Piesowicz
Article
Chemistry, Multidisciplinary
Przemyslaw Lopato, Michal Herbko
APPLIED SCIENCES-BASEL
(2020)
Article
Chemistry, Physical
Jakub Kowalczyk, Przemyslaw Lopato, Grzegorz Psuj, Dariusz Ulbrich
Article
Chemistry, Analytical
Grzegorz Psuj, Przemyslaw Lopato, Michal Maciusowicz, Michal Herbko
Summary: This paper introduces a system based on the ferromagnetic resonance method for monitoring changes in the magnetization dynamics of steel elements subjected to deformations. The system operation was verified using a set of samples made of low carbon steel film, showing successful differentiation of changes in magnetic conditions caused by the straining process.
Article
Chemistry, Physical
Barbara Szymanik, Grzegorz Psuj, Maryam Hashemi, Przemyslaw Lopato
Summary: This paper proposes a new method based on active infrared thermography for assessing the state of 3D-printed structures. The technique involves using an external energy source to create temperature differences between undamaged and defective areas, which may be hard to measure in materials with low thermal conductivity. A dedicated algorithm and deep convolutional neural network are used for signal analysis to enhance contrast between background and defect areas. Experimental results demonstrate the effectiveness of this hybrid signal analysis method in visualizing inner structure and determining defect parameters such as depth and diameter.
Article
Chemistry, Physical
Michal Herbko, Przemyslaw Lopato
Summary: This article introduces a microstrip sensor using a single cell metamaterial as a resonator, allowing for significant miniaturization with minimal decrease in sensitivity. The proposed sensor is suitable for measuring local deformation values and in areas with limited access.
Article
Engineering, Electrical & Electronic
Michal Herbko, Przemyslaw Lopato, Grzegorz Psuj, Prabhu Rajagopal
Summary: This article investigates the use of various fractal patch geometries in microstrip strain sensors. By comparing the performance of fractal geometries with rectangular patches, it is found that the best solution to this problem is to use a combination of the Koch curve and the Sierpinski carpet, which can reduce the patch size by 70% while still maintaining a high sensitivity.
IEEE SENSORS JOURNAL
(2022)
Article
Engineering, Electrical & Electronic
Barbara Szymanik, Grzegorz Psuj, Przemyslaw Lopato
Summary: This article presents an approach to quantitatively evaluate 3D printed samples made of polyethylene terephthalate glycol (PETG) using active infrared thermography (AIT) with halogen lamps excitation. Numerical and experimental studies were conducted, where a numerical model solved with finite element method (FEM) was used to create a signal database and train neural networks. The trained networks successfully detected the heterogeneity of the internal structure and estimated defect positions in the tested printed samples.
INTERNATIONAL JOURNAL OF APPLIED ELECTROMAGNETICS AND MECHANICS
(2022)
Article
Chemistry, Multidisciplinary
Paulina Gora, Przemyslaw Lopato
Summary: This paper presents a method for quality evaluation of thin dielectric layers using a tunable split-ring resonator-based metasurface. By monitoring the resonant frequency of the metasurface when the unit cell geometry changes, the quality of the thin dielectric layer placed near the metasurface can be evaluated. The study derives the approximation-based relations between resonant frequencies and dielectric parameters, providing more information for permittivity evaluation.
APPLIED SCIENCES-BASEL
(2022)
Article
Computer Science, Information Systems
Przemyslaw Lopato, Michal Herbko, Paulina Gora, Ulrich Mescheder, Andras Kovacs, Alexander Filbert
Summary: The purpose of this paper was to investigate the influence of fabrication process uncertainty on terahertz metasurface quality, specifically focusing on the effect of metasurface fabrication inaccuracy on resonances. This is the first known study to examine the impact of the metasurface fabrication process on its resonant frequency. The study analyzed the influence of uncertainty in various geometrical parameters obtained during fabrication, such as layer deposition, photolithography, and etching processes, on the resonance of the designed metasurface. The developed numerical model was validated through THz-TDS measurements of the fabricated structure.
Article
Engineering, Multidisciplinary
Przemyslaw Lopato, Michal Herbko, Ulrich Mescheder, Andras Kovacs
Summary: This article investigates the effect of an additional thin dielectric layer on the top of the metasurface (MS) on the transmission of electromagnetic waves in the terahertz band. The study examined the influence of permittivity, film thickness, and suspension height on the transmission coefficient characteristics. The research has potential applications in creating tunable MSs, protecting MS sensors, and studying the dielectric properties of thin films.
