Ultrasonics最新文献

{"title":"Adiabatic Lamb modes in 3D tapered waveguides: Cut-off effects and ZGV resonances","authors":"Alexandre Yoshitaka Charau ,&nbsp;Jérôme Laurent ,&nbsp;Tony Valier-Brasier","doi":"10.1016/j.ultras.2025.107733","DOIUrl":"10.1016/j.ultras.2025.107733","url":null,"abstract":"<div><div>This paper aims to enhance our understanding of the physical behavior of adiabatic modes in inhomogeneous elastic plates, particularly their remarkable capacity to adapt to gradual perturbations. The study investigates the propagation characteristics of higher-order adiabatic Lamb modes in waveguides with linearly varying thickness, with a focus on the influence of critical thicknesses on their propagation. This is achieved by leveraging the broadband excitation capabilities of a pulsed laser generating higher order Lamb modes to reveal various critical thicknesses, such as the cut-off and Zero-Group Velocity (ZGV) thicknesses. Remarkably, ZGV resonances can be induced at locations well beyond the laser source. Moreover, the mode’s behavior is strongly influenced by thickness variations in all directions, imparting the plate an anisotropic-like behavior. Additionally, based on the observed effects, our experimental approach enables precise reconstruction of elastic waveguide profiles in additively manufactured aluminum plates with such thickness variations. The reconstructed profiles show a strong correlation with reference measurements across the scanned area.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"155 ","pages":"Article 107733"},"PeriodicalIF":3.8,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144549522","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"SAFE method for dispersion characteristics of fluid-saturated porous media with arbitrary cross sections","authors":"Hongyan Zhang ,&nbsp;Peng Zuo ,&nbsp;Jian Li ,&nbsp;Zhoumo Zeng ,&nbsp;Yang Liu","doi":"10.1016/j.ultras.2025.107745","DOIUrl":"10.1016/j.ultras.2025.107745","url":null,"abstract":"<div><div>Understanding the dispersion characteristics of guided waves is crucial for the application of ultrasonic guided wave method in fluid-saturated porous media. In this paper, the Semi-Analytical Finite Element (SAFE) method is applied to analyze the dispersion characteristics in fluid-saturated porous media. We derive the SAFE equations for fluid-saturated porous media and reformulate them into the standard Finite Element (FE) eigenvalue form that can be solved using COMSOL Multiphysics. Unlike the simple boundaries of elastic waveguides (such as free or rigid boundaries), the boundary conditions of fluid-saturated porous media present an additional challenge in the analysis of guided wave problems. We also derive the open-pore and closed-pore boundary conditions for fluid-saturated porous media and reformulate them into standard FE form. On this basis, we analyzed the causes of high-attenuation modes, wave structures, energy distribution, and the effects of surface treatment methods. The proposed method is first validated on waveguides with regular cross sections. Furthermore, we apply the SAFE method to L-shaped fluid-saturated porous bar for which there is no analytical solution, demonstrating the unique advantages of the SAFE method in solving the dispersion characteristics of irregular fluid-saturated porous media.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"155 ","pages":"Article 107745"},"PeriodicalIF":3.8,"publicationDate":"2025-06-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144517638","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A UGW communication method using Barker encoding and improved PPM for rail structural health monitoring","authors":"Xiaoyuan Wei ,&nbsp;Jing Jing ,&nbsp;Jing Dai ,&nbsp;Xiaohui Yang","doi":"10.1016/j.ultras.2025.107744","DOIUrl":"10.1016/j.ultras.2025.107744","url":null,"abstract":"<div><div>Given the high communication cost in the existing rail structural health monitoring (SHM) system UGW-based and no GPRS signals in the tunnel, a novel communication method in the rail based on Barker encoding and improved pulse position modulation (IPPM) is proposed in this work. Firstly, to overcome the low signal-to-noise ratio (SNR) of UGW signals resulting from dispersion and multimodal properties, Barker codes are involved in encoding excitation signals for piezoelectric ultrasonic transducers. Besides, an IPPM method is presented to diminish the multipath effect, improving communication robustness. Secondly, an enhanced communication scheme is established by combining Barker encoding with IPPM (B-IPPM). Then the feasibility and reliability of the proposed B-IPPM communication scheme are examined through simulations and experiments based on a pitch-catch mechanism. Finally, the proposed IPPM and B-IPPM methods can achieve error-free transmission, and compared to PPM and IPPM, the B-IPPM can significantly improve the bit rate (BR), achieving 1.6 times and 1.1 times the BR of PPM and IPPM, respectively. To sum up, the proposed B-IPPM modulation scheme demonstrates robust performance for the communication UGW-based in the rail.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"155 ","pages":"Article 107744"},"PeriodicalIF":3.8,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523964","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Analysis of guided wave propagation in highly damped viscoelastic multilayered composite structures using the biot model","authors":"Zelin Xu ,&nbsp;Tiqing Wang ,&nbsp;Peng Li ,&nbsp;Bin Wang ,&nbsp;Zhenghua Qian ,&nbsp;Taizo Maruyama ,&nbsp;Feng Zhu ,&nbsp;Iren Kuznetsova","doi":"10.1016/j.ultras.2025.107724","DOIUrl":"10.1016/j.ultras.2025.107724","url":null,"abstract":"<div><div>Guided wave-based methodologies are a fundamental approach in structural health monitoring and non-destructive testing due to their ability to propagate over extended distances while enabling comprehensive structural coverage with minimal instrumentation and reduced inspection time. This study focuses on the analysis of highly damped viscoelastic multilayered composite structures, which are widely used in aerospace applications and require rigorous investigation to achieve accurate predictive modeling and performance assessment. Conventional viscoelastic models, such as the Hysteretic and Kelvin–Voigt formulations, exhibit limitations in accurately capturing the complex damping behaviors inherent to highly attenuative materials. To address these constraints, the Biot model is introduced as an advanced framework capable of more accurately representing viscoelastic effects within intricate composite laminates. The Moduli Ratio Convergence Method is applied with adaptations, to facilitate an in-depth analysis of wave propagation phenomena in such materials. This enhanced algorithm enables the precise determination of critical parameters, including dissipation amplitude, dispersion characteristics, phase velocity, energy velocity, and mode shape diagrams. These insights are leveraged to investigate unique wave phenomena, such as the veering of dispersion curves and frequency shifts observed in spectrograms projected onto the real plane. A qualitative analysis highlights the distinctive frequency shift phenomenon observed in the Biot model, which does not appear in the Hysteretic and Kelvin–Voigt models, providing deeper insights into the unique wave characteristics introduced by the Biot model. Comparisons with purely elastic media further explore the influence of viscoelasticity on wave propagation behaviors. To validate the analytical framework, comparisons are systematically made between viscoelastic and purely elastic cases. The findings demonstrate the robustness and applicability of the proposed methodologies, offering a reliable foundation for optimizing sensor deployment in SHM applications for anisotropic viscoelastic composite structures.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"155 ","pages":"Article 107724"},"PeriodicalIF":3.8,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144516970","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Defect imaging of electromagnetic acoustic transducer dead-zone with oblique incidence and full skip SAFT method","authors":"Yang Zheng,&nbsp;Jinwen He,&nbsp;Zongjian Zhang,&nbsp;Fei Xue,&nbsp;Binpeng Zhang","doi":"10.1016/j.ultras.2025.107728","DOIUrl":"10.1016/j.ultras.2025.107728","url":null,"abstract":"<div><div>As EMAT generate vibration and ultrasonic directly on the surface of testing object, the dead-zone that caused by transducer near filed and instrument system initial impulse cannot be eliminated with time-delay wedge block like piezoelectric transducer. Thus detecting the defects in near surface dead-zone is a key problem for EMAT non-destructive testing. To address the problem this paper proposed a new Full-skip Synthetic aperture focusing technique (FS-SAFT), and optimized oblique incidence meander-line coil EMAT for this imaging algorithm implement. Finite element model was developed to analyze the propagation characteristics of EMAT transmitted acoustic field with different line space, frequency and line number. Also, the interaction of secondary reflected waves with defects. Experimental verification was carried out on aluminum alloys and 20# test blocks with through-hole and grooved crack defects. The simulation and experimental results show that the new imaging method and optimized EMAT can imaging the near surface field and testing defects in dead-zone under full transverse wave mode. At a high temperature of 300°, the transducer can detect near-surface defects in 20# steel by using this algorithm, and the test sensitivity at high temperature can reach a 5 mm diameter through hole. This new EMAT imaging method lays a foundation for detecting and imaging near-surface defects in metal equipment components especially on elevated temperature.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"155 ","pages":"Article 107728"},"PeriodicalIF":3.8,"publicationDate":"2025-06-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144516968","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Multi-mode plane wave imaging based full-section inspection for ultra-thick welds with the compact array","authors":"Xinzhi Ma ,&nbsp;Mu Chen ,&nbsp;Xu Gu ,&nbsp;Xintao Xu ,&nbsp;Keji Yang ,&nbsp;Deqing Mei ,&nbsp;Haiteng Wu ,&nbsp;Jian Chen ,&nbsp;Haoran Jin","doi":"10.1016/j.ultras.2025.107727","DOIUrl":"10.1016/j.ultras.2025.107727","url":null,"abstract":"<div><div>Full-section ultrasonic non-destructive testing of ultra-thick welds (thickness <span><math><mo>&gt;</mo></math></span>90 mm) traditionally requires multiple transducer groups with multiple scanning to achieve full coverage, resulting in bulky equipment and low inspection efficiency. This study presents a multi-mode plane wave imaging (MM-PWI) technique that enables efficient, full-section inspection of ultra-thick welds using a single compact transducer array. The proposed method decouples various skipping modes of longitudinal and shear waves to reconstruct flaws throughout the weld from top to bottom. To address signal attenuation caused by multiple wave skips, the vector coherence factor (VCF) is applied, significantly improving the signal-to-noise ratio (SNR) of the images. Experimental results demonstrate that a 120-mm-thick weld can undergo fully inspection using a 64-element array with a 0.6 mm pitch. All flaws can be inspected in a single scan with SNRs exceeding 32 dB. The main advantage of the proposed method lies in its simplicity and stability in the testing process, which can significantly improve inspection efficiency and be easily applied in industrial inspections.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"155 ","pages":"Article 107727"},"PeriodicalIF":3.8,"publicationDate":"2025-06-25","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144501096","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Characterization of multilayer films using ultrafast photoacoustic technology and artificial intelligence","authors":"Zhiheng Chen ,&nbsp;Hongyuan Zhao ,&nbsp;Yueying Hou ,&nbsp;Enrui Zhang ,&nbsp;Sicheng Yan ,&nbsp;Junheng Yao ,&nbsp;Xiaodong Xu ,&nbsp;Xue-Jun Yan ,&nbsp;Ming-Hui Lu ,&nbsp;Yan-Feng Chen","doi":"10.1016/j.ultras.2025.107741","DOIUrl":"10.1016/j.ultras.2025.107741","url":null,"abstract":"<div><div>A high-precision nanoscale characterization technology for multilayer films is critical in microelectronics, optoelectronics and bio-medicine. Ultrafast photoacoustic technology provides non-contact structural profiling with sub-nanometer resolution. In this study, an advanced scheme combining ultrafast photoacoustic method and Artificial Intelligence (AI) is applied to automatically measure the thicknesses and crystal orientations of multilayer thin films and superlattices. We developed a dataset using a multilayer photoacoustic theoretical model consistent with experimental results. To mitigate experimental noise, we applied a variational mode decomposition (VMD)-backpropagation neural network (BPNN) algorithm and an AlexNet framework for samples properties prediction. Characterization results in SiO₂, LiNbO₃ multilayers and GaAs/AlAs superlattices verify that this AI-based scheme can automatically get the knowledge of multiple properties with a higher precision in principle. This method enables tomographic detection of complex nanostructures and offers a novel approach for real-time monitoring of integrated devices and biomedical imaging.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"155 ","pages":"Article 107741"},"PeriodicalIF":3.8,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144516969","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"On the robustness of coded excitation in ultrasonic acquisition systems","authors":"Connor Challinor,&nbsp;Frederic Cegla","doi":"10.1016/j.ultras.2025.107726","DOIUrl":"10.1016/j.ultras.2025.107726","url":null,"abstract":"<div><div>Coded excitation has been shown to be a simple yet effective technique for improving signal quality in ultrasonic active ranging applications. Despite many reported benefits, uptake of coded excitation in industrial applications to date has been minimal. The authors speculate that this can be in part attributed to a lack of understanding of the robustness of the technique in practical use. To combat this, this paper reports on research into the main mechanisms that can introduce performance degradation and describes the effect of the two most important mechanisms, referred to as symbol asymmetry and symbol misalignment. These mechanisms lower output signal quality through the introduction of unexpected signal artifacts, as well as by reducing useful signal amplitude. We show how symbol asymmetry can be introduced through hardware imperfections and the relative degradation severity associated with different imperfection types. We similarly show how symbol misalignment can be introduced when using coded excitation in non-stationary situations. As a result, we formulate the minimum hardware requirements and inspection conditions required to correctly utilise coded excitation such that users can be confident of achieving high quality outcomes. We quantitatively simulate and experimentally verify the output signal degradation across many scenarios to identify the operating conditions that need to be satisfied to ensure that degradation does not exceed an arbitrarily chosen threshold of 40 dB (the noise floor from random noise in our experimental setup).</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"155 ","pages":"Article 107726"},"PeriodicalIF":3.8,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144570329","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Sparse aperture ultrasound-guided acoustic vortex tweezers for real-time microbubble aggregation in peripheral vasculature","authors":"Dongdong Liang ,&nbsp;Jiabin Zhang ,&nbsp;Di Wang ,&nbsp;Xiaoyu Qian ,&nbsp;Feihong Dong ,&nbsp;Jinyu Yang ,&nbsp;Yunlong Bao ,&nbsp;Jue Zhang","doi":"10.1016/j.ultras.2025.107718","DOIUrl":"10.1016/j.ultras.2025.107718","url":null,"abstract":"<div><h3>Objective:</h3><div>Acoustic vortex tweezers (AVT) have potential to enhance the targeting efficiency of drug-loaded microbubbles (MBs). However, three major challenges remain: poor real-time imaging quality with single matrix probe, difficulty in switching between imaging and AVT emission, and difficulty in using real-time imaging to guide AVT focusing. In this study, we propose a novel approach to address these challenges through the application of a sparse-aperture emission strategy integrating ultrasound flow-imaging and AVT techniques.</div></div><div><h3>Methods:</h3><div>We present a real-time blood flow imaging (BFI) navigated AVT technique. Acoustic field characterization was conducted to compare sparse and full-aperture configurations using hydrophone measurements. Pulse parameter optimization for MBs aggregation efficiency was systematically analyzed using in vitro flow phantom models. Technical feasibility was ultimately evaluated through experiments in rabbit hindlimb venous vasculature.</div></div><div><h3>Results:</h3><div>The acoustic field of AVT at sparse aperture was consistent with that of full-aperture AVT. In the in vitro phantom, the acoustic pressure ranged from 0.35 to 0.65 MPa, with a pulse repetition frequency (PRF) greater than 1.5 kHz. This configuration effectively aggregated MBs at flow rates between 20 and 110 mL/h. We observed real-time venous blood flow in the lower limbs of rabbits and successfully guided AVT to aggregate MBs.</div></div><div><h3>Conclusion:</h3><div>This exploratory study combining BFI and AVT provides a novel approach for the controllable accumulation and quantitative release of drug-loaded MBs in future applications.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"155 ","pages":"Article 107718"},"PeriodicalIF":3.8,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144523752","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Singular value decomposition based motion magnification for B-mode visualization of magnetomotive ultrasound imaging","authors":"Wei-Hsiang Shen ,&nbsp;Tzu-Min Yeh ,&nbsp;Chih-Chia Huang ,&nbsp;Zung-Hang Wei ,&nbsp;Meng-Lin Li","doi":"10.1016/j.ultras.2025.107722","DOIUrl":"10.1016/j.ultras.2025.107722","url":null,"abstract":"<div><div>Magnetomotive ultrasound (MMUS) is a new modality for ultrasound imaging that detects magnetic nanoparticles within tissues. To localize these nanoparticles, an external oscillating magnetic field is used to induce magnetomotion of the nanoparticles, and motion tracking algorithms are used to track the motion sources, allowing the mapping of the nanoparticle distribution. The induced magnetomotion is generally at sub-wavelength and thus not visualizable to the naked eye in conventional B-mode imaging. In this work, we introduce a singular value decomposition (SVD)-based motion magnification technique for MMUS, enabling B-mode visualization of magnetomotion in B-mode imaging. An singular value filter (SVF) is designed adaptively to extract and amplify the induced magnetomotion of the nanoparticles in MMUS imaging, offering a visually clear representation of their dynamics and the associated shear wave propagation. We evaluated the technique using simulations, phantom experiments, and <em>in vivo</em> data. Our motion-magnified results reveal previously unseen motions of the nanoparticles, even in the presence of undesired motion noises. This research offers a new visualization mode for MMUS imaging.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"156 ","pages":"Article 107722"},"PeriodicalIF":3.8,"publicationDate":"2025-06-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"144571355","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}