Ultrasonics最新文献

{"title":"Interaction effects on acoustic emissions of submicron ultrasound contrast agents at subharmonic resonances","authors":"Hongmei Tang ,&nbsp;Qiao Xiao ,&nbsp;Jia Fu ,&nbsp;Siyuan Liu ,&nbsp;Wei Wang ,&nbsp;Dui Qin","doi":"10.1016/j.ultras.2024.107553","DOIUrl":"10.1016/j.ultras.2024.107553","url":null,"abstract":"<div><div>Submicron ultrasound contrast agents hold great potential to extend the bubble-mediated theranostics beyond the vasculature, but their acoustic response and the interaction effects between them remain poorly understood. This study set out to numerically examine the interaction effects on the subharmonic oscillations of nanobubbles and the resultant acoustic emissions under subharmonic resonance conditions. Results showed that a negative correlation between bubble size and subharmonic resonance frequency is readily obtained from the radius response curves. Moreover, it was also found that the larger nanobubble in a two-nanobubble system generally acts as the primary determinant for the subharmonic oscillations of the smaller one. Specifically, a larger nanobubble excited at its subharmonic resonance conditions can force a smaller nanobubble to undergo subharmonic oscillations, resulting in the generation of subharmonic acoustic emissions. Conversely, under specific resonance conditions, a smaller nanobubble undergoing subharmonic oscillations can also be restrained by a larger nanobubble that is off-resonance and consequently its subharmonic component disappears. Furthermore, it also clearly demonstrated that the generation of subharmonic resonance is pressure threshold dependent and the subharmonic resonant radius is distinctly reduced as the acoustic pressure increases. By contrast, a larger nanobubble has a lower pressure threshold than that of a smaller one, when subjected to their subharmonic resonance conditions respectively. More importantly, the higher pressure threshold of a smaller nanobubble can be prominently decreased by the interaction effects from a nearby larger nanobubble. For two interacting nanobubbles, the interaction effects strongly depend on the inter-bubble distance, and the farther the two nanobubbles is, the weaker the interaction effects become and even can be ignored. Additionally, the impacts of the lipid shell properties indicated that increasing shell viscoelasticity can increase the subharmonic resonant radius but dampen the subharmonic oscillations and the resultant acoustic emissions, which is more sensitive to the shell viscosity. This study can contribute to a better understanding of the complex interaction effects between submicron ultrasound contrast agents on the resultant acoustic emissions, potentially advancing nanobubble-specific ultrasound applications.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107553"},"PeriodicalIF":3.8,"publicationDate":"2024-12-11","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142839802","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":"Mitigating high frame rate demands in shear wave elastography using radial basis function-based reconstruction: An experimental phantom study","authors":"Sajjad Afrakhteh,&nbsp;Libertario Demi","doi":"10.1016/j.ultras.2024.107542","DOIUrl":"10.1016/j.ultras.2024.107542","url":null,"abstract":"<div><h3>Background:</h3><div>Shear wave elastography (SWE) is a technique that quantifies tissue stiffness by assessing the speed of shear waves propagating after being excited by acoustic radiation force. SWE allows the quantification of elastic tissue properties and serves as an adjunct to conventional ultrasound techniques, aiding in tissue characterization. To capture this transient propagation of the shear wave, the ultrasound device must be able to reach very high frame rates.</div></div><div><h3>Methodology:</h3><div>In this paper, our aim is to relax the high frame rate requirement for SWE imaging. To this end, we propose lower frame rate SWE imaging followed by employing a 2-dimensional (2D) radial basis functions (RBF)-based interpolation. More specifically, the process involves obtaining low frame rate data and then temporal upsampling to reach a synthetic high frame rate data by inserting the ‘UpS-1’ image frames with missing values between two successive image frames (UpS: Upsampling rate). Finally, we apply the proposed interpolation technique to reconstruct the missing values within the incomplete high frame rate data.</div></div><div><h3>Results and conclusion:</h3><div>The results obtained from employing the proposed model on two experimental datasets indicate that we can relax the frame rate requirement of SWE imaging by a factor of 4 while maintaining shear wave speed (SWS), group velocity, and phase velocity estimates closely align with the high frame rate SWE model so that the error is less than 3%. Furthermore, analysis of the structural similarity index (SSIM) and root mean squared error (RMSE) on the 2D-SWS maps highlights the efficacy of the suggested technique in enhancing local SWS estimates, even at a downsampling (DS) factor of 4. For <span><math><mrow><mi>D</mi><mi>S</mi><mo>≤</mo><mn>4</mn></mrow></math></span>, the SSIM values between the 2D-SWS maps produced by the proposed technique and those generated by the original high frame rate data consistently remain above 0.94. Additionally, the RMSE values is below 0.37 m/s, indicating promising performance of the proposed technique in reconstruction of SWS values.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107542"},"PeriodicalIF":3.8,"publicationDate":"2024-12-10","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142824444","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"A resonant quadruped piezoelectric robot inspired by human butterfly swimming patterns","authors":"Jiateng Shi ,&nbsp;Pingqing Fan ,&nbsp;Jie Liu","doi":"10.1016/j.ultras.2024.107543","DOIUrl":"10.1016/j.ultras.2024.107543","url":null,"abstract":"<div><div>Piezoelectric micro-robots have gained considerable attention in rescue and medical applications due to their rapid response times and high positioning accuracy. In this paper, inspired by the human butterfly locomotion pattern, we propose a novel resonant four-legged piezoelectric micro-robot designed to achieve fast and efficient movement in complex and confined spaces. The robot utilizes the parallel piezoelectric bimorph as the driving unit, and its leg structure mimics the butterfly motion. By employing asymmetric driving forces, the robot can achieve multi-directional movement. A dynamic model of the robot is developed, and the stress and motion characteristics are analyzed. The finite element method (FEM) is applied to optimize the structural parameters and determine the robot’s optimal operating frequency. Finally, the prototype of the piezoelectric robot is constructed, and its performance is evaluated. The results show that, under an excitation voltage of 80 V, the robot achieves a maximum speed of 66.1 mm/s, can carry a load of up to 100 g, and withstand a maximum drag force of 15.3 mN. The robot demonstrates sub-micron resolution, excellent environmental adaptability, and precise rotational capabilities, making it suitable for tasks such as exploration, mapping, and sampling in constrained environments.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107543"},"PeriodicalIF":3.8,"publicationDate":"2024-12-05","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142795140","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":"Advanced synthetic aperture technique to enhance image quality in ultrasound elastography: A novel strategy","authors":"Arpan Ghosh,&nbsp;Arun K Thittai","doi":"10.1016/j.ultras.2024.107535","DOIUrl":"10.1016/j.ultras.2024.107535","url":null,"abstract":"<div><div>Quasi-static elastography (QSE) is a well-established technique used in medical imaging, where ultrasound data is collected both, before and after applying a slight compression on a tissue. This data is then analyzed to create image frames that reveal the stiffness parameter of the underlying tissue medium. Previous studies have focused on assessing how the Conventional Focused Beam (CFB) transmit method impacts the ultrasound elastography image quality. Recent studies have also shown an interest in synthetic aperture techniques like the Diverging Beam Synthetic Aperture Technique (DBSAT), due to its potential to enhance ultrasound image quality. However, its application in elastography has received limited attention. This paper introduces a new strategy of averaging low-resolution elastogram frames (LREA), obtained from DBSAT transmit method to improve the quality of elastography images. The CFB technique involves scanning the tissue line by line. In contrast, DBSAT is a synthetic aperture method that generates multiple low-resolution elastogram frames before combining them together to create a single high-quality image. In this research paper all the experimental studies were conducted on an agar-gelatin phantom, demonstrating the effectiveness of estimating elastograms from the low-resolution frame data of DBSAT transmit scheme and then summing them together to produce an elastogram with enhanced image quality. The results show a maximum improvement of 8 dB in the image quality metric of signal-to-noise ratio (SNR) as well as a 7 dB improvement in contrast-to-noise ratio (CNR) when comparing elastography images obtained by the proposed LREA method and the elastography images obtained by regular processing of the RF data acquired using the different methods of CFB and DBSAT.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107535"},"PeriodicalIF":3.8,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142795152","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":"SAFT imaging for high-density polyethylene using quasi-static components of ultrasonic longitudinal waves","authors":"Gonglin Wang,&nbsp;Caibin Xu,&nbsp;Quanqing Lai,&nbsp;Mingxi Deng","doi":"10.1016/j.ultras.2024.107534","DOIUrl":"10.1016/j.ultras.2024.107534","url":null,"abstract":"<div><div>High-density polyethylene (HDPE) is extensively utilized across various industries, including nuclear power, primarily for its exceptional properties. However, there are challenges with traditional linear ultrasound imaging systems due to the significant thicknesses and the highly attenuative of HDPE. High-frequency carrier waves can offer better imaging resolution but also suffer higher acoustic attenuation, which limits the propagation distance of primary longitudinal waves (PLW) and makes it difficult to detect defects within thick HDPEs. On the other hand, using low-frequency PLW for defect detection presents challenges in resolution despite lower attenuation and longer propagation distances. This study proposes a defect imaging method for HDPEs by using quasi-static components (QSC) generated along with high-frequency fundamental wave propagation because of the nonlinear effect. The QSC has the advantage of low attenuation because its carrier frequency is zero, which can propagate a long distance in a high acoustic attention medium like HDPE. A nonlinear ultrasonic imaging approach combining the QSC and synthetic aperture focusing technique is proposed for defect imaging in HDPEs. Experiments on HDPEs with single and multiple defects are conducted to verify the performance of the proposed method. For comparison, the imaging results using traditional linear ultrasounds with high (2.5 MHz) and low (0.5 MHz) carrier frequencies are also provided. The results show the proposed method has better imaging performance over traditional linear ultrasound imaging methods for defect defections in high acoustic attention medium.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107534"},"PeriodicalIF":3.8,"publicationDate":"2024-11-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142792385","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":"In-situ monitoring of µm-sized electrochemically generated corrosion pits using Lamb waves managed by a sparse array of piezoelectric transducers","authors":"C. Nicard ,&nbsp;M. Rébillat ,&nbsp;O. Devos ,&nbsp;M. El May ,&nbsp;F. Letellier ,&nbsp;S. Dubent ,&nbsp;M. Thomachot ,&nbsp;M. Fournier ,&nbsp;P. Masse ,&nbsp;N. Mechbal","doi":"10.1016/j.ultras.2024.107527","DOIUrl":"10.1016/j.ultras.2024.107527","url":null,"abstract":"<div><div>Corrosion is a major threat in the aeronautic industry, both in terms of safety and cost. Efficient, versatile, and cost affordable solutions for corrosion monitoring are thus needed. Ultrasonic Lamb Waves (LW) appear to be very efficient for corrosion monitoring and can be made cost effective and versatile if emitted and received by a sparse array of piezoelectric elements (PZT). A LW solution relying on a sparse PZT array and allowing to monitor µm-sized corrosion pit growth on stainless 316L grade steel plate is here evaluated. Experimentally, the corrosion pit size is electrochemically controlled by both the imposed electrical potential and the injection of a corrosive NaCl solution through a capillary located at the desired pit location. In parallel, the corrosion pit growth is monitored in-situ every 10 s by sending and measuring LW using a sparse array of 4 PZTs bonded to the back of the steel plate enduring corrosion. As a ground truth information, the corrosion pit volume is estimated as the dissolved volume balancing the electronic charges exchanged during corrosion. The corrosion pit radius is additionally checked post-experiment precisely with an optical measurement. Measured LW signals are then post-processed in order to compute a collection of synthetic damage indexes (DIs). After dimension reduction steps, obtained DI values correlates extremely well with the corrosion pit radius. Using a linear model relating those DI values to corrosion pit radius, it is demonstrated that corrosion pit from 30 <!--> <!-->µm to 150 <!--> <!-->µm can be reliably detected, located, and their upcoming size extrapolated. Two independent experiments were achieved in order to ensure the repeatability of the proposed approach. LW managed by a sparse PZT array thus appears to be reliable and efficient to monitor growth of µm-sized corrosion pits on 316L steel plates. If embedded in aeronautical structure, such an approach could be a versatile and cost-effective alternative to actual non-destructive maintenance procedures that are time and manpower consuming.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"147 ","pages":"Article 107527"},"PeriodicalIF":3.8,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722391","PeriodicalName":null,"FirstCategoryId":null,"ListUrlMain":null,"RegionNum":2,"RegionCategory":"物理与天体物理","ArticlePicture":[],"TitleCN":null,"AbstractTextCN":null,"PMCID":"OA","EPubDate":null,"PubModel":null,"JCR":null,"JCRName":null,"Score":null,"Total":0}

{"title":"Enhanced integrated acoustofluidics with printed circuit board electrodes attached to piezoelectric film coated substrate","authors":"Chao Sun ,&nbsp;Roman Mikhaylov ,&nbsp;Xiaoye Yang ,&nbsp;Xiaoyan Zhang ,&nbsp;Kungui Feng ,&nbsp;Tengfei Zheng ,&nbsp;Yong-Qing Fu ,&nbsp;Xin Yang","doi":"10.1016/j.ultras.2024.107531","DOIUrl":"10.1016/j.ultras.2024.107531","url":null,"abstract":"<div><div>The current key issues in applying acoustofluidics in engineering lie in the inflexibility of manufacturing processes, particularly those involving modifications to piezoelectric materials and devices. This leads to inefficient prototyping and potentially high costs. To overcome these limitations, we proposed a technique that is capable of prototyping acoustofluidic devices in a straightforward manner. This is achieved by simply clamping a printed circuit board (PCB) featuring interdigital electrodes (IDEs) onto a substrate coated with a piezoelectric thin film. By applying appropriate clamping force between the PCB and the substrate, one can effectively generate surface acoustic waves (SAWs) along the surface of the substrate. This approach simplifies the prototyping process, reducing the complexity and fabrication time. The clamping mechanism allows for easy adjustment and optimization of the SAW generation, enabling fine-tuning of the fluid and particle manipulation capabilities. Furthermore, this method allows for customizable interdigital transducers (IDTs) by ‘patterning’ IDEs on thin-film piezoelectric substrates (such as ZnO/Al and ZnO/Si) with various anisotropy orientations. This facilitates the on-demand generation of wave modes, including A0 and S0 Lamb waves, Rayleigh waves, and Sezawa waves. One notable advantage of this method is its capability to rapidly test acoustic wave patterns and performance on any substrate, offering a fast and streamlined approach to assess acoustic behaviors across diverse materials, thereby paving the way for efficient exploration of novel materials in SAW technology.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"147 ","pages":"Article 107531"},"PeriodicalIF":3.8,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142745896","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":"Temperature-compensated acoustoelastic measurements of the stress in bolts","authors":"Yuqiang Han,&nbsp;Haiying Huang,&nbsp;Wenlu Cai,&nbsp;Minghai Li,&nbsp;Yongjian Mao,&nbsp;Chong Li","doi":"10.1016/j.ultras.2024.107532","DOIUrl":"10.1016/j.ultras.2024.107532","url":null,"abstract":"<div><div>Temperature is an important factor influencing the results of non-destructive acoustoelastic measurements of the internal stress in objects like bolts owing to its impact on the elastic modulus of the material. However, conventional methods that seek to obtain the temperature field of the measurement object independently suffer from high complexity and low accuracy. The present work addresses this issue by developing a method that eliminates the influence of temperature on the acoustoelastic measurements of stress in bolts based on the time interval between the head and coda waves of ultrasonic signals. The origin of coda waves in rod-shaped objects is investigated theoretically, and this understanding is applied for analyzing the relationship between the temperature and internal stress of the object and the time interval between the head and coda waves of ultrasonic signals. The analysis demonstrates that the observed time interval is related to temperature and stress in accordance with a linear relationship with the velocity of the longitudinal wave and the rod diameter. Finally, the obtained relationship is applied within an acoustoelastic measurement model to eliminate the influence of temperature from the measurement results.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107532"},"PeriodicalIF":3.8,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142747931","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":"The parameter mapping of power ultrasonic transducer model","authors":"Junfan Fu,&nbsp;Bin Lin,&nbsp;Tianyi Sui,&nbsp;Baokun Dong","doi":"10.1016/j.ultras.2024.107533","DOIUrl":"10.1016/j.ultras.2024.107533","url":null,"abstract":"<div><div>The vibration and electrical characteristics of transducer is determined by material coefficients and geometry, with material coefficients being susceptible to factors including frequency, pressure, and temperature, which leads to poor repeatability of transducer characteristics. Consequently, it is challenging to provide an accurate theoretical model to predict the characteristics based on the current material coefficients. To achieve a more accurate transducer model, a measurement method is proposed based on the mapping between material coefficients and transducer characteristic parameters to obtain accurate coefficients under working conditions with simple equipment and lower costs. The mapping is analyzed based on the transducer model, identifying five key coefficients. An iterative optimization method is then developed to measure these coefficients. Additionally, the genetic algorithm (GA) method is utilized for cross-checking. Transducers made from seven different materials and with varying lengths are measured, and the coefficients are obtained by both methods. With the obtained coefficients, the vibration and electrical characteristics of multi-material transducers is predicted and found to be in good agreement with the measured values, validating the transducer model and the coefficient measurement method. These coefficients are then compared with results obtained from a dynamic mechanical analyzer (DMA) and reference values. The results demonstrate that theoretical coefficients obtained by the proposed method lead to more accurate predictions for the vibration and electrical characteristics compared to those obtained from the DMA and reference values. Furthermore, the influence of frequency on the coefficients is studied by the method. The iterative method and GA method are compared in terms of their relative errors.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107533"},"PeriodicalIF":3.8,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142792395","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":"Twice reflected ultrasonic bulk wave for surface defect monitoring","authors":"Voon-Kean Wong ,&nbsp;Xiaotian Li ,&nbsp;Yasmin Mohamed Yousry ,&nbsp;Marilyne Philibert ,&nbsp;Chao Jiang ,&nbsp;David Boon Kiang Lim ,&nbsp;Percis Teena Christopher Subhodayam ,&nbsp;Zheng Fan ,&nbsp;Kui Yao","doi":"10.1016/j.ultras.2024.107530","DOIUrl":"10.1016/j.ultras.2024.107530","url":null,"abstract":"<div><div>This work offers an ultrasonic structural health monitoring (SHM) approach for assessing the defects located on the same surface and at one side of piezoelectric ultrasonic transducer array. It is based on the analysis of ultrasonic bulk wave travelling in the thickness direction obtained from an enhanced full-skip configuration of the time-of-flight diffraction (TOFD) technique. In contrast to existing TOFD setup only considering the direct paths between the ultrasonic transducer and defect, our ultrasound monitoring configuration involves twice reflected ultrasonic bulk wave (TRBW). The TRBW travels following the propagation route from an ultrasonic transmitter located at the same side of the defect initiated, the backwall, the defect tip, the backwall again and finally to the same or another ultrasonic transducer. Both theoretical analyses and experimental validations have been conducted in our study. A simplified algorithm for efficient detection and mapping the growth of a surface defect in an aluminum alloy block has been demonstrated with an incremental surface defect growth starting from 2.80 mm in depth, in which conformable direct-write ultrasonic transducers (DWT) made of in-situ piezoelectric coating are implemented. Our approach provides an ultrasonic method for effective monitoring the near surface defects with the ultrasonic transducers conveniently implemented on the same surface and at the same side of the defects.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"147 ","pages":"Article 107530"},"PeriodicalIF":3.8,"publicationDate":"2024-11-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142722387","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}