Ultrasonics最新文献

{"title":"Numerical investigation on the oscillation performance of an acoustically suspended plate using flexural vibration","authors":"Yuanyuan Liu ,&nbsp;Xiaodong Sun ,&nbsp;Zilong Zhao ,&nbsp;Lin Geng","doi":"10.1016/j.ultras.2025.107591","DOIUrl":"10.1016/j.ultras.2025.107591","url":null,"abstract":"<div><div>Near-field acoustic levitation (NFAL) technology holds significant promise for applications in the manufacturing processes of wafers and other delicate components, owing to its advantages such as compactness, environmental friendliness, and unlimited materials for suspended objects. NFAL relies on high-frequency vibrations to generate the squeeze film that suspends objects, which inherently leads to oscillations of the suspended objects. To date, no research has been conducted to predict the oscillation performance of a suspended object under a flexural radiator. The objective of this study is to address this challenge and thereby expand the application of NFAL in precision fields. First, the pressure and thickness distributions of the squeeze film at steady state are obtained by solving the governing equations using the finite difference method. Subsequently, the stiffness and damping coefficients of the squeeze film are computed by employing the infinitesimal perturbation method. Second, a predictive model for the oscillation displacement of suspended objects is developed based on the transfer function method. The numerical results show good agreement with measurements from the experimental setup constructed for this study. Finally, the results of the parametric study indicate that higher levitation accuracy is achieved with an increased weight of the reflector. Moreover, the influence of the radiator’s vibration amplitude and air temperature on levitation accuracy is found to be limited within certain parameter ranges.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"149 ","pages":"Article 107591"},"PeriodicalIF":3.8,"publicationDate":"2025-02-01","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143317372","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":"Dual-frequency excitation in high-frame-rate ultrasonic backscatter coefficient analysis of hemorheological properties","authors":"Masaaki Omura ,&nbsp;Kunimasa Yagi ,&nbsp;Ryo Nagaoka ,&nbsp;Kenji Yoshida ,&nbsp;Tadashi Yamaguchi ,&nbsp;Hideyuki Hasegawa","doi":"10.1016/j.ultras.2025.107589","DOIUrl":"10.1016/j.ultras.2025.107589","url":null,"abstract":"<div><div>Hemorheological properties, such as erythrocyte aggregation can be assessed by ultrasonic backscatter coefficient analysis. In this study, a data-acquisition sequence with dual-frequency (dual-<em>f</em>) excitation was proposed to expand the ultrasonic frequency bandwidth with high-frame-rate imaging. The approach was experimentally validated using <em>ex vivo</em> porcine blood measurements and <em>in vivo</em> human imaging. The center frequency of the excitation wave was alternated between 7.8 (<em>f</em>₁) and 12.5 (<em>f</em>₂) MHz in the frequency spectral analysis using the reference phantom method. The frequency spectra revealed that the dual-<em>f</em> sequence achieved a bandwidth of 4.5–15 MHz at −20 dB, almost equivalent to those achieved with conventional single-frequency excitation (5.0–15 MHz) with a short-duration wave at 10 MHz (mono-<em>f</em>) in reference media with the sufficient condition of signal-to-noise ratio. The aggregation and disaggregation states of porcine blood suspended in high-molecular-weight dextran were determined by the isotropic diameter and packing factor using the structure factor size estimator. The discrimination performance of the dual-<em>f</em> approach increased, owing to the broadband frequency responses, in contrast with the limited performance of mono-<em>f</em> due to a low signal-to-noise ratio. This approach incorporating dual-<em>f</em> sequence is beneficial for obtaining robustly frequency spectra of hemorheological properties from <em>in vivo</em> scenarios.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"149 ","pages":"Article 107589"},"PeriodicalIF":3.8,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143100708","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":"Development of the lens-focused air-coupled ultrasonic transducer for non-destructive testing","authors":"Jinjie Zhou ,&nbsp;Qiyun Liu ,&nbsp;Xuemin Wang ,&nbsp;Yang Zheng","doi":"10.1016/j.ultras.2025.107590","DOIUrl":"10.1016/j.ultras.2025.107590","url":null,"abstract":"<div><div>To realize highly efficient excitation and reception, a focused air-coupled ultrasonic transducer was developed based on concave spherical aluminum alloy acoustic lens and double spherical matching layers. Firstly, the effect of different volume fractions of the piezoelectric ceramics on the 1–3 piezoelectric composite performance was analyzed using series–parallel theory. The 1–3 piezoelectric composite with a volume fraction of 60 % was proposed. Secondly, the lens-focused air-coupled ultrasonic transducer was developed, the simulation and experimental results showed that the focused area of the transducer was at 18 mm. The double spherical matching layers greatly increased the energy to air of the transducer. Finally, the signal amplitude and sensitivity of the developed transducer was twice and 45.0 % higher than that of flat-plate transducer in the CFRP composite detection experiments. Thus, the developed transducer showed a greater advantage in practical application.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"149 ","pages":"Article 107590"},"PeriodicalIF":3.8,"publicationDate":"2025-01-30","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143317373","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":"Physics-based generative adversarial network for real-time acoustic holography","authors":"Qingyi Lu ,&nbsp;Chengxi Zhong ,&nbsp;Hu Su ,&nbsp;Song Liu","doi":"10.1016/j.ultras.2025.107583","DOIUrl":"10.1016/j.ultras.2025.107583","url":null,"abstract":"<div><div>Acoustic holography (AH) encodes the acoustic fields in high dimensions into two-dimensional holograms without information loss. Phase-only holography (POH) modulates only the phase profiles of the encoded hologram, establishing its superiority over alternative modulation schedules due to its information volume and storage efficiency. Moreover, POH implemented by a phased array of transducers (PAT) facilitates active and dynamic manipulation by independently modulating the phase of each transducer. However, existing algorithms for POH calculation suffer from a deficiency in terms of high fidelity and good real-time performance. Thus, a deep learning algorithm reinforced by the physical model, i.e. Angular Spectrum Method (ASM), is proposed to learn the inverse physical mapping from the target field to the source POH. This method comprises a generative adversarial network (GAN) evaluated by soft label, which is referred to as soft-GAN. Furthermore, to avoid the intrinsic limitation of neural networks on high-frequency features, a Y-Net structure is developed with two decoder branches in frequency and spatial domain, respectively. The proposed method achieves the reconstruction performance with a state-of-the-art (SOTA) Peak Signal-to-Noise Ratio (PSNR) of 24.05 dB. Experiment results demonstrated that the POH calculated by the proposed method enables accurate and real-time hologram reconstruction, showing enormous potential for applications.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"149 ","pages":"Article 107583"},"PeriodicalIF":3.8,"publicationDate":"2025-01-28","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143081188","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 miniature FUS transducer based on an acoustic Fresnel lens for integration with a surgical robot","authors":"Jack Stevenson,&nbsp;Margaret Lucas","doi":"10.1016/j.ultras.2025.107587","DOIUrl":"10.1016/j.ultras.2025.107587","url":null,"abstract":"<div><div>A new focussed ultrasound surgery (FUS) transducer for soft tissue ablation is proposed, with a miniaturised configuration that can be readily integrated with a surgical robot. The transducer fills a gap in FUS technology at this size, with capability for acoustic focus steering within a very simple transducer configuration. Miniaturisation is enabled by the incorporation of an acoustic Fresnel lens as the focussing element driven by a single piezoceramic disc. The transducer housing and Fresnel lens are made from photopolymer resins in a mask stereolithography (mSLA) printer and a microballoon filled epoxy backing layer is added to approximate an air backing. In this study, four versions of the miniature FUS transducer were fabricated and tested, each incorporating a different piezoceramic material: a soft PZT, a specialised composition for high intensity focused ultrasound, a low acoustic impedance porous PZT, and a lead free piezoceramic. It is shown that the FUS transducer containing the porous piezoceramic disc, which has lower piezoelectric and coupling coefficients than the other materials, achieves the highest focal zone intensity. Through finite element analysis (FEA) and experimental characterisations of the acoustic field, the FUS transducer is demonstrated to be capable of both creating and steering a focal intensity suitable for tissue ablation.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"149 ","pages":"Article 107587"},"PeriodicalIF":3.8,"publicationDate":"2025-01-23","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143068181","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":"Plane wave compounding with adaptive joint coherence factor weighting","authors":"Nikunj Khetan ,&nbsp;Jerome Mertz","doi":"10.1016/j.ultras.2025.107573","DOIUrl":"10.1016/j.ultras.2025.107573","url":null,"abstract":"<div><div>Coherent Plane Wave Compounding (CPWC) is widely used for ultrasound imaging. This technique involves transmitting plane waves into a sample at different transmit angles and recording the resultant backscattered echo at different receive positions. The time-delayed signals from the different combinations of transmit angles and receive positions are then coherently summed to produce a beamformed image. Various techniques have been developed to characterize the quality of CPWC beamforming based on the measured coherence across the transmit or receive apertures. Here, we propose a more granular approach where the signals from every transmit/receive combination are separately evaluated using a quality metric based on their joint spatio-angular coherence. The signals are then individually weighted according to their measured Joint Coherence Factor (JCF) prior to being coherently summed. To facilitate the comparison of JCF beamforming compared to alternative techniques, we further propose a method of image display standardization based on contrast matching. We show results from tissue-mimicking phantoms and human soft-tissue imaging. Fine-grained JCF weighting is found to improve CPWC image quality compared to alternative approaches.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"149 ","pages":"Article 107573"},"PeriodicalIF":3.8,"publicationDate":"2025-01-22","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143081190","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":"Ultrasonic backscattering model of lamellar duplex phase microstructures in polycrystalline materials","authors":"Zenghua Liu ,&nbsp;Jinlong Li ,&nbsp;Yang Zheng ,&nbsp;Cunfu He","doi":"10.1016/j.ultras.2025.107581","DOIUrl":"10.1016/j.ultras.2025.107581","url":null,"abstract":"<div><div>Carbon steel and low alloy steel are pearlitic heat-resistant steels with a lamellar microstructure. There are good mechanical properties and are widely used in crucial components of high-temperature pressure. However, long-term service in high-temperature environments can easily lead to material degradation, including spheroidization, graphitization, and thermal aging. This study proposes a theoretical model of ultrasonic backscattering with a lamellar structure in pearlite areas. It analyzes the effects of different pearlite area ratios and interlamellar spacing on ultrasonic backscattering signals. A Voronoi diagram is used to constructs a two-dimensional finite element (FE) model of the lamellar structure, and the effects of different pearlite area ratio and interlamellar spacing on the backscattering signals are analyzed to verify the correctness of the theoretical model. By preparing spheroidization samples of various grades, the change values of pearlite area ratio and interlamellar spacing are measured. The backscattering signals of different spheroidization samples are collected through the ultrasonic testing experimental platform, and the root-mean-square (RMS) maximum values of the ultrasonic backscattering are extracted. The observed trend is consistent with the theoretical model, finite element method (FEM), and experimental. Compared with the experimental results, the model results have some errors, but can be used to evaluate the performance degradation of metallic materials with lamellar pearlite structure.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"149 ","pages":"Article 107581"},"PeriodicalIF":3.8,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143042058","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 wavefield reconstruction based on Physics-Informed neural networks","authors":"Bin Xu ,&nbsp;Yun Zou ,&nbsp;Gaofeng Sha ,&nbsp;Liang Yang ,&nbsp;Guixi Cai ,&nbsp;Yang Li","doi":"10.1016/j.ultras.2025.107582","DOIUrl":"10.1016/j.ultras.2025.107582","url":null,"abstract":"<div><div>In recent years, the widespread application of laser ultrasonic (LU) devices for obtaining internal material information has been observed. However, this approach demands a significant amount of time to acquire complete wavefield data. Hence, there is a necessity to reduce the acquisition time. In this work, we propose a method based on physics-informed neural networks to decrease the required sampling measurements. We utilize sparse sampling of full experimental data as input data to reconstruct complete wavefield data. Specifically, we employ physics-informed neural networks to learn the propagation characteristics from the sparsely sampled data and partition the complete grid to reconstruct the full wavefield. We achieved 95% reconstruction accuracy using four hundredth of the total measurements. The proposed method can be utilized not only for sparse wavefield reconstruction in LU testing but also for other wavefield reconstructions, such as those required in online monitoring systems.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"149 ","pages":"Article 107582"},"PeriodicalIF":3.8,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143042056","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":"Precision of in vivo pressure gradient estimations using synthetic aperture ultrasound","authors":"Lars Emil Haslund ,&nbsp;Alexander Cuculiza Henriksen ,&nbsp;Billy Yat Shun Yiu ,&nbsp;Ali Salari ,&nbsp;Marie Sand Traberg ,&nbsp;Lasse Thurmann Jørgensen ,&nbsp;Borislav Gueorguiev Tomov ,&nbsp;Michael Bachmann Nielsen ,&nbsp;Jørgen Arendt Jensen","doi":"10.1016/j.ultras.2025.107574","DOIUrl":"10.1016/j.ultras.2025.107574","url":null,"abstract":"<div><div>Non-invasive estimation of pressure differences using 2D synthetic aperture ultrasound imaging offers a precise, low-cost, and risk-free diagnostic tool. Unlike invasive techniques, this preserves natural blood flow and avoids the limitations of devices that occupy lumen space. This paper evaluates a previously published estimator, modified to incorporate Singular Value Decomposition (SVD) echo-cancellation, using data from ten healthy volunteers and one patient. It is hypothesized that the estimator will enable precise pressure differences from the common carotid artery with a coefficient of variation of approximately 10% over a 10-second data acquisition period. Here, precision is essential to demonstrate the method’s consistency and its ability to differentiate between healthy and diseased arteries at the earliest possible stage. Data are acquired using a GE-9L-D, 5.2 MHz linear transducer connected to a Vantage 256 research scanner. The estimator was applied to the left common carotid artery of ten healthy volunteers, with precision being evaluated over the recorded heart cycles by using the coefficient of variation. Eight out of ten individuals showed precision below 10%, whereas two individuals showed precision above 20%. The best precision was attained by subject_03 with a coefficient of variation of 4.64% (16.1 Pa) and the worst precision was attained by subject 09 with a coefficient of variation of 23.3% (30.2 Pa). The average range of pressure differences across volunteers (from maximum positive to maximum negative pressure difference) was 297 Pa when measured across a 14 mm streamline. The corresponding average coefficient of variation was found to be 9.95% (24.6 Pa). A comparison of peak systolic velocities between the experimental scanner and the reference scanner demonstrates a strong positive linear correlation (R<span><math><msup><mrow></mrow><mrow><mn>2</mn></mrow></msup></math></span> = 0.76). The corresponding slope of the linear best fit is 0.95, indicating that the relationship between the two scanners is close to a one-to-one match, with the experimental scanner’s measurements being slightly less than those of the reference scanner. Finally, data attained from a single patient example shows pressure differences ranging from −61.81 Pa to 1240.82 Pa with blood velocities as high as 1.73 m/s, which is significantly higher than seen in any of the healthy volunteers, supporting the likelihood of differentiating between stenosis grades in future studies. While this study is limited to 10 healthy volunteers and one patient, a different study design is needed to quantify the severity of stenosis and correlate it with pressure differences.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"149 ","pages":"Article 107574"},"PeriodicalIF":3.8,"publicationDate":"2025-01-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143042052","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 novel design for double-bending elliptical vibration boring device and its performance evaluation","authors":"Yunxiang Zheng,&nbsp;Cheng Hu,&nbsp;Mao Wang,&nbsp;Zongpu Wu,&nbsp;Jianguo Zhang,&nbsp;Jianfeng Xu","doi":"10.1016/j.ultras.2025.107584","DOIUrl":"10.1016/j.ultras.2025.107584","url":null,"abstract":"<div><div>Steel precision matching parts are widely used in aerospace and automobiles. In order to ensure the stability of the system, the matching parts’ mating surfaces, such as inner holes and outer shafts, are required to achieve nano-surface roughness and submicron-shape accuracy. Diamond-cutting technology is generally used for ultra-precision machining processes. However, it is not suitable for machining steel due to the active chemical reactions. Ultrasonic elliptical vibration cutting technology can significantly reduce the cutting heat to suppress the chemical wear of diamond tools. Consequently, this study proposes a novel simple theory-simulation design method for an ultrasonic elliptical vibration boring (UEVB) device. The device works in two six-order bending vibration modes, generating an elliptical tool motion in the plane determined by the nominal cutting direction and the cutting depth direction. Through the impedance test, frequency sweep test, and amplitude test, the test results of the device match well with the simulation results. The experimental results of cutting S136 steel show that the UEVB technology suppresses system chatter by 10 % and reduces surface roughness Ra by 72 % compared with common boring. Additionally, the tool has much light wear and the machined surface roughness is Ra 11.3 nm, which realizes the ultra-precision cutting of steel by diamond tools. Furthermore, the roundness of the processed hole, with a diameter of 30 mm, reaches 0.473 μm, which is significantly better than the highest standard grade G1 (0.5 μm). These results verify the feasibility of the proposed method.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"149 ","pages":"Article 107584"},"PeriodicalIF":3.8,"publicationDate":"2025-01-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"143029396","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}