Ultrasonics最新文献_第9页

Applicability and applications of alternative TOFD techniques 替代TOFD技术的适用性和应用。

IF 3.8 2区物理与天体物理

Ultrasonics Pub Date : 2024-12-26 DOI: 10.1016/j.ultras.2024.107563

Shijie Jin, Zhicheng Wang, Xinhao Wang, Shuyao Huangfu, Zhongbing Luo

{"title":"Applicability and applications of alternative TOFD techniques","authors":"Shijie Jin, Zhicheng Wang, Xinhao Wang, Shuyao Huangfu, Zhongbing Luo","doi":"10.1016/j.ultras.2024.107563","DOIUrl":"10.1016/j.ultras.2024.107563","url":null,"abstract":"<div><div>Ultrasonic time-of-flight diffraction (TOFD) technique is applied to non-destructive testing in engineering, but the dead zone influences its applicable range. Alternative TOFD techniques adopt the indirect diffracted waves having long propagation times to decouple from the lateral wave and detect near-surface defects. It should be noted that the applicability of these diffracted waves varies with parameter conditions employed for detection, e.g., sample thickness, defect depth, inspection frequency and probe center spacing (PCS). In this paper, aluminum alloy plates are selected as the research objects for comparative analysis and actual application of alternative TOFD techniques. For each alternative TOFD technique, the minimum time difference between structural waves, e.g., lateral wave and back-wall waves, and indirect diffracted wave in TOFD signals and images is defined as the evaluation index for characterizing its applicability. Three-dimensional diagrams of the applicability of mode-converted wave, LS-L wave and LL-S wave (L and S are the longitudinal wave and shear wave, respectively) are provided sequentially by theoretical calculations. On this basis, the theoretical model for selecting the optimal alternative TOFD technique under reasonable parameter conditions is established by compositing different three-dimensional diagrams. TOFD inspection was implemented on the defects with depths of 2.0–3.0 mm in the aluminum alloy plates with 7–20 mm thicknesses. The experimental results indicate that the alternative TOFD technique determined by the theoretical model is most suitable for detecting shallow subsurface defects. The range of dead zone is decreased effectively with the measurement errors of defect depths no more than 3.6 %. The related works have universality and can be extended to TOFD inspection of other materials and structures in future.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107563"},"PeriodicalIF":3.8,"publicationDate":"2024-12-26","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142910924","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}

引用次数: 0

Ultrasonic detection of wrinkles in composites with gradual phase shift migration 超声波检测复合材料中的褶皱与渐进相移迁移。

IF 3.8 2区物理与天体物理

Ultrasonics Pub Date : 2024-12-24 DOI: 10.1016/j.ultras.2024.107557

Haiyan Zhang , Jinfeng Si , Hui Zhang , Heming Wei , Yiting Chen , Wenfa Zhu , Kailiang Xu , Qi Zhu

{"title":"Ultrasonic detection of wrinkles in composites with gradual phase shift migration","authors":"Haiyan Zhang , Jinfeng Si , Hui Zhang , Heming Wei , Yiting Chen , Wenfa Zhu , Kailiang Xu , Qi Zhu","doi":"10.1016/j.ultras.2024.107557","DOIUrl":"10.1016/j.ultras.2024.107557","url":null,"abstract":"<div><div>Fiber reinforced polymer composites (FRPs) are essential for various industrial fields, but wrinkles inside will greatly reduce their mechanical properties. Full-matrix capture (FMC) is a popular data structure for ultrasonic phased array imaging in composites. However, such structure may lead to data redundancy and noise interference. In this paper, a gradual phase shift migration (GPSM) is proposed to characterize wrinkles accurately. The gradual matrix is formed from the expansion along principal diagonal of FMC data with equal transmitter–receiver spacing. The dilemma between lateral resolution and sidelobe interference intensity is resolved to obtain the best imaging resolution by selecting an appropriate data structure. Moreover, to address the inconsistency of ultrasound velocities at different propagation directions caused by anisotropy of composites, the angle-dependant velocity is corrected by backwall reflection method (BRM). Based on gradual matrix data, the velocity-corrected phase shift factor is applied in the GPSM algorithm to obtain the wavefield at different depths through a layer-by-layer wavefield extrapolation. The experimental results indicate that four wrinkles can be detected in thick hybrid carbon-glass FRPs based on GPSM, with angle detection errors less than 6%. Furthermore, the GPSM method combining partial diagonal data takes only 0.5 s, achieving 60% improvement in computational efficiency compared to that with all gradual matrix data. The proposed method can be applied for high-resolution imaging of various multilayered medium in real-time.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107557"},"PeriodicalIF":3.8,"publicationDate":"2024-12-24","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142915661","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}

引用次数: 0

Intraoperative HIFU ablation of the liver at the hepatocaval confluence as adjunct to surgery: Preliminary animal experiments 术中肝空腔汇合处肝HIFU消融辅助手术：初步动物实验。

IF 3.8 2区物理与天体物理

Ultrasonics Pub Date : 2024-12-20 DOI: 10.1016/j.ultras.2024.107556

Sophie Cambronero , Aurélien Dupré , Charles Mastier , Yao Chen , Olivier Hamelin , David Melodelima

{"title":"Intraoperative HIFU ablation of the liver at the hepatocaval confluence as adjunct to surgery: Preliminary animal experiments","authors":"Sophie Cambronero , Aurélien Dupré , Charles Mastier , Yao Chen , Olivier Hamelin , David Melodelima","doi":"10.1016/j.ultras.2024.107556","DOIUrl":"10.1016/j.ultras.2024.107556","url":null,"abstract":"<div><div>Treating colorectal liver metastases (CLMs) located at the hepatocaval confluence with surgery is challenging due to its complexity and associated high risks of perioperative mortality and morbidity. Moreover, thermal ablation techniques are sensitive to the “heat-sink” effect, which reduces their efficacy when tumors are in contact with major blood vessels. In this study we evaluated the feasibility and safety of an intraoperative high-intensity focused ultrasound (HIFU) device for destroying liver tissue volumes sufficiently large to consider treating CLMs at the hepatocaval confluence. Experiments were conducted on six pigs that were followed up to 19 days after the treatment. One HIFU ablation in each animal was created using a 370 s exposure at 100 W. Homogeneous HIFU ablations of liver tissues were safely created at the hepatocaval confluence around the hepatic veins (HVs) in all animals. The targeted HVs were similar to those of humans, with an average diameter of 9.1 ± 1.4 mm. The longest and shortest axes of the HIFU ablations were on average 44.5 ± 11.5 mm and 26.7 ± 4.9 mm, respectively. These values indicate that this device could destroy CLMs up to 2 cm in diameter. Doppler acquisitions, MRI and histological analysis confirmed that HIFU ablations were in contact with the inferior vena cava and extended to the HV wall and that blood flow was maintained. This in vivo preclinical study showed that intraoperative HIFU destruction of liver tissues at the hepatocaval confluence under Doppler ultrasound guidance could therefore represent a new therapeutic option for CLMs.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107556"},"PeriodicalIF":3.8,"publicationDate":"2024-12-20","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142886149","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}

引用次数: 0

A signal energy approach of acoustic source localization in plate structures using a discrete sensor array 基于离散传感器阵列的板结构声源定位的信号能量方法。

IF 3.8 2区物理与天体物理

Ultrasonics Pub Date : 2024-12-19 DOI: 10.1016/j.ultras.2024.107555

Chenning Ma , Zhiwen Cui , Jinxia Liu , Tribikram Kundu

{"title":"A signal energy approach of acoustic source localization in plate structures using a discrete sensor array","authors":"Chenning Ma , Zhiwen Cui , Jinxia Liu , Tribikram Kundu","doi":"10.1016/j.ultras.2024.107555","DOIUrl":"10.1016/j.ultras.2024.107555","url":null,"abstract":"<div><div>In the field of engineering structural health monitoring, acoustic source localization (ASL) is a common method to monitor early damage. Most of the existing ASL techniques have high requirements for accurate acquisition of time of arrival, and require complex iterative algorithms or signal processing techniques, which are not conducive to real-time monitoring. In this paper, a signal energy approach of acoustic source localization in plate structures using a discrete sensor array is proposed. The proposed method overcomes the above problems by simply using the amplitude of the recorded signal to calculate the energy and does not need to know the mechanical properties of the material in advance. Thus, it should be useful for real-time and efficient prediction of acoustic source. Numerical simulations and experiments are carried out on aluminum and composite plates to demonstrate the feasibility and application potential of the proposed method. The proposed method demonstrates good accuracy and holds significant potential for wide-ranging applications in the health monitoring of plate structures.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107555"},"PeriodicalIF":3.8,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142898568","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}

引用次数: 0

Quantitative evaluation of corrosion-thinning defect by an instantaneous wavenumber multi-shot fusion method based on laser ultrasonic guided wavefield detection 基于激光超声导波场检测的瞬时波数多枪融合方法对腐蚀减薄缺陷的定量评价。

IF 3.8 2区物理与天体物理

Ultrasonics Pub Date : 2024-12-19 DOI: 10.1016/j.ultras.2024.107561

Zenghua Liu , Xiaoyu Liu , Jiuzhou Tian , Di Gao , Cunfu He , Bin Wu

{"title":"Quantitative evaluation of corrosion-thinning defect by an instantaneous wavenumber multi-shot fusion method based on laser ultrasonic guided wavefield detection","authors":"Zenghua Liu , Xiaoyu Liu , Jiuzhou Tian , Di Gao , Cunfu He , Bin Wu","doi":"10.1016/j.ultras.2024.107561","DOIUrl":"10.1016/j.ultras.2024.107561","url":null,"abstract":"<div><div>The thickness loss caused by corrosion is a vital factor that threatens the health of shell structures. It is significant to perform a non-destructive quantitative evaluation of corrosion-thinning defects in plate structures. Based on the laser ultrasonic guided wavefield scanning technology, this paper proposes an instantaneous wavenumber multi-shot fusion method, which improves the performance of the instantaneous wavenumber imaging method. The guided wave mode and excitation parameters are selected through quantitative analysis. A simulation analysis revealed the interaction between guided wavefield and defect with local thickness loss under multiple excitation positions. The results show that a more accurate wavenumber estimation of the defect area can be achieved by utilizing the abundant wavefield information from multiple-point excitations. In addition, the imaging accuracy between single and multiple excitation techniques is compared and analyzed quantitatively in the experiment. It shows that the proposed method can improve the imaging accuracy in the defect area and suppress the imaging noise in the non-defect area, which verifies its effectiveness.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107561"},"PeriodicalIF":3.8,"publicationDate":"2024-12-19","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142910925","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}

引用次数: 0

Online detection and evaluation of early fatigue cracks using sideband peak intensity technique with frequency-mismatched excitation pulse-echo method 基于频率不匹配激励脉冲回波的边带峰值强度技术在线检测与评价早期疲劳裂纹。

IF 3.8 2区物理与天体物理

Ultrasonics Pub Date : 2024-12-18 DOI: 10.1016/j.ultras.2024.107559

Fengling Wang , Mingzhu Sun , Shuzeng Zhang , Guangdong Zhang , Xiongbing Li , Tribikram Kundu

{"title":"Online detection and evaluation of early fatigue cracks using sideband peak intensity technique with frequency-mismatched excitation pulse-echo method","authors":"Fengling Wang , Mingzhu Sun , Shuzeng Zhang , Guangdong Zhang , Xiongbing Li , Tribikram Kundu","doi":"10.1016/j.ultras.2024.107559","DOIUrl":"10.1016/j.ultras.2024.107559","url":null,"abstract":"<div><div>This work presents a nonlinear ultrasonic (NLU) technique called sideband peak intensity (SPI) combining an improved pulse-echo (PE) experimental method for online detection and evaluation of fatigue cracks at their early stages. Advantages of the proposed technique are that it enjoys the high sensitivity and ease of application of NLU SPI technique and easy implementation of the PE experimental method. The PE experimental method is improved by adopting frequency-mismatched excitations to enhance the sensitivity and robustness of the SPI technique. In frequency-mismatched excitation mode, the frequency of the initial excitation differs from the nominal central frequency of the transducer, resulting in distinguishable sideband peaks compared to frequency-matched excitation. Experimental results in fatigue damaged specimens show that the SPI values obtained using the proposed frequency-mismatched excitation in PE method are more sensitive to early fatigue cracks than those obtained using the frequency-matched excitation method. Online ultrasonic experiments were also conducted to quantify wave signals from the specimen at various fatigue stages affixed to the fatigue testing apparatus, and it was found that online detection can achieve results consistent with offline detection. This work provides a more sensitive and robust NLU method for online measurements of fatigue cracks in engineering structures and can benefit the nondestructive testing and evaluation community.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107559"},"PeriodicalIF":3.8,"publicationDate":"2024-12-18","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142883103","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}

引用次数: 0

The effect of micro-vessel viscosity on the resonance response of a two-microbubble system 微血管粘度对双微泡系统共振响应的影响。

IF 3.8 2区物理与天体物理

Ultrasonics Pub Date : 2024-12-17 DOI: 10.1016/j.ultras.2024.107558

Hossein Yusefi , Brandon Helfield

{"title":"The effect of micro-vessel viscosity on the resonance response of a two-microbubble system","authors":"Hossein Yusefi , Brandon Helfield","doi":"10.1016/j.ultras.2024.107558","DOIUrl":"10.1016/j.ultras.2024.107558","url":null,"abstract":"<div><div>Clinical ultrasound contrast agent microbubbles remain intravascular and are between 1–8 µm in diameter, with a volume-weighted mean size of 2–3 µm. Despite their worldwide clinical utility as a diagnostic contrast agent, and their continued and ongoing success as a local therapeutic vector, the fundamental interplay between microbubbles – including bubble–bubble interaction and the effects of a neighboring viscoelastic vessel wall, remain poorly understood. In this work, we developed a finite element model to study the physics of the complex system of two different-sized bubbles (2 and 3 µm in diameter) confined within a viscoelastic vessel from a resonance response perspective (3–12 MHz). Here, we focus on the effect of micro-vessel wall viscosity on the resulting vibrational activity of the two-bubble system. The larger bubble (3 µm) was not influenced by its smaller companion bubble, and we observed a significant dampening effect across all transmit frequencies when confined within the vessel of increasing viscosity, an expected result. However, the smaller bubble (2 µm) was highly influenced by its larger neighboring bubble, including the induction of a strong low-frequency resonant response – resulting in transmit frequency windows in which its response in a lightly damped vessel far exceeded its vibration amplitude when unconfined. Further, micro-vessel wall dynamics closely mimic the frequency-dependence of the adjacent bubbles. Our findings imply that for a system of multi-bubbles within a viscoelastic vessel, the larger bubble physics dominates the system by inducing the smaller bubble and the vessel wall to follow its vibration – an effect that can be amplified within a lightly damped vessel. These findings have important implications for contrast-enhanced ultrasound imaging and therapeutic applications.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107558"},"PeriodicalIF":3.8,"publicationDate":"2024-12-17","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142872987","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}

引用次数: 0

Ultrasound imaging with flexible transducers based on real-time and high-accuracy shape estimation 基于实时、高精度形状估计的柔性换能器超声成像。

IF 3.8 2区物理与天体物理

Ultrasonics Pub Date : 2024-12-14 DOI: 10.1016/j.ultras.2024.107551

Xue Gao , Lihong Huang , Peng Huang , Yuanyuan Wang , Yi Guo

{"title":"Ultrasound imaging with flexible transducers based on real-time and high-accuracy shape estimation","authors":"Xue Gao , Lihong Huang , Peng Huang , Yuanyuan Wang , Yi Guo","doi":"10.1016/j.ultras.2024.107551","DOIUrl":"10.1016/j.ultras.2024.107551","url":null,"abstract":"<div><div>Ultrasound imaging with flexible transducers requires the knowledge of shape geometry for effective beamforming, which such geometry is variable and often unknown. The conventional iteration-based shape estimation methods estimate transducer shape with high computational expense. Although deep-learning-based methods are introduced to reduce computation time, their low shape estimation accuracy limits the practical applications. In this paper, we propose a novel deep-learning-based approach, called FlexSANet, for shape estimation in ultrasound imaging with flexible transducers, which rapidly achieves precise shape estimation and then reconstructs high-quality images. First, in-phase/quadrature (I/Q) data are demodulated from raw radio frequency (RF) data to provide comprehensive guidance for the estimation task. A sparse processing mechanism is employed to extract crucial channel signals, resulting in sparse I/Q data and reducing the estimation time. Then, a spatial-aware shape estimation network establishes a one-shot mapping between the sparse I/Q data and the flexible probe shape. Finally, the ultrasound image is reconstructed using the delay-and-sum (DAS) beamformer with estimated shape. Massive comparisons on simulation datasets and <em>in vivo</em> datasets demonstrate the superiority of the proposed shape estimation method in rapidly and accurately estimating the transducer shape, leading to real-time and high-quality imaging. The mean absolute error of element position in shape estimation is below 1/8 wavelengths for simulation and <em>in vivo</em> experiments, indicating minimal element position error. The structural similarity between the ultrasound images reconstructed with real and estimated shapes is above 0.84 for simulation experiments and 0.80 for <em>in vivo</em> experiments, demonstrating superior image quality. More significantly, its estimation time on CPU of only 0.12 s promises clinical application potential of flexible ultrasound transducers.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107551"},"PeriodicalIF":3.8,"publicationDate":"2024-12-14","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142855606","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}

引用次数: 0

A laser ultrasound emitter based on high-power diode laser in overdrive operation mode for biomedical imaging applications 一种基于大功率二极管激光器超速工作模式的生物医学成像激光超声发射器。

IF 3.8 2区物理与天体物理

Ultrasonics Pub Date : 2024-12-13 DOI: 10.1016/j.ultras.2024.107548

Miguel Sanchez , Daniel Gallego , Alexander A. Oraevsky , Horacio Lamela

{"title":"A laser ultrasound emitter based on high-power diode laser in overdrive operation mode for biomedical imaging applications","authors":"Miguel Sanchez , Daniel Gallego , Alexander A. Oraevsky , Horacio Lamela","doi":"10.1016/j.ultras.2024.107548","DOIUrl":"10.1016/j.ultras.2024.107548","url":null,"abstract":"<div><div>The most common transducers used to generate ultrasound in medical applications are based on short electrical pulses applied to piezoelectric transducers and capacitive micromachined ultrasound transducers. However, piezoelectric transducers have a limited frequency bandwidth, defined by their physical thickness, and capacitive micromachined ultrasound transducers have poor transmission efficiency. The high frequency cutoff limits the spatial resolution of ultrasonic images. The low frequency cutoff limits volumetric contrast of objects on ultrasound images so that typically only tissue boundaries are displayed. These limitations can be overcome with laser generated ultrasound. Laser ultrasound generation is based on the optoacoustic effect, which greatly increases the bandwidth of ultrasound signals. We show the generation of ultra-wideband ultrasound pulses using high power diode lasers operating in the overdrive regime, and thin composite films of candle soot in polydimethylsiloxane matrix as transmitters. We achieved a peak pressure of 228.59 kPa and a ultrawive bandwidth of 0.1 MHz-to-30 MHz (<span><math><mrow><mi>B</mi><msub><mrow><mi>W</mi></mrow><mrow><mn>6</mn><mi>d</mi><mi>B</mi></mrow></msub><mo>≈</mo><mn>200</mn><mtext>%</mtext></mrow></math></span>) at -6 dB level with an optoacoustic conversion efficiency of 6.27 × 10<sup>−3</sup> [Pa/(W/m<sup>2</sup>)] or 3.35 × 10<sup>6</sup> [Pa/(mJ/cm<sup>2</sup>)]. We present a compact and low-cost ultra-wideband laser ultrasound emitter with the possibility to adjust the bandwidth of the transmitted frequency and the ability to generate ultrasonic images in ex-vivo tissues.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107548"},"PeriodicalIF":3.8,"publicationDate":"2024-12-13","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142878131","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}

引用次数: 0

Investigation of a multi-frequency ultrasonic acoustic pressure source for acoustic agglomeration 一种用于声团聚的多频超声声压源的研究。

IF 3.8 2区物理与天体物理

Ultrasonics Pub Date : 2024-12-12 DOI: 10.1016/j.ultras.2024.107554

Andrius Čeponis , Darius Vainorius , Kristina Kilikevičienė , Artūras Kilikevičius

{"title":"Investigation of a multi-frequency ultrasonic acoustic pressure source for acoustic agglomeration","authors":"Andrius Čeponis , Darius Vainorius , Kristina Kilikevičienė , Artūras Kilikevičius","doi":"10.1016/j.ultras.2024.107554","DOIUrl":"10.1016/j.ultras.2024.107554","url":null,"abstract":"<div><div>This paper represents numerical and experimental investigations of an ultrasonic multifrequency piezoelectric acoustic pressure source whose target application is acoustic agglomeration of fine and ultrafine particles. The operation of source is based on three vibration modes at 25.83 kHz, 34.73 kHz and 52.41 kHz. Multi-frequency operation allows to obtain three different patterns of acoustic pressure levels which allows to increase performance of the agglomeration process while particles sizes change over time or process. Moreover, acoustic pressure levels, as well as their patterns, were investigated while the source was driven by rectangular and sawtooth signals. Excitation by nonharmonic signals ensured possibility of obtaining modified patterns which results changes in the acoustic pressure levels gradients and allows to obtain different amplitudes of particles vibrations in the agglomeration chamber. Results of numerical and experimental investigations have shown that the ultrasonic acoustic pressure source under excitation by square and sawtooth signals is able to provide maximum sound pressure in the range from 121.6 dB to 132.2 dB while maximum SPL values generated by harmonic signal were indicated in range from 116.4 dB to 129.3 dB. Finally, experimental investigations of acoustic fields impacting particle decrement in air flow have shown that generation of acoustic field by square and sawtooth-shaped signals is able to provide up to 21.38 % and 27.88 % decrement level of 0.3 µm and 1 µm sized particles.</div></div>","PeriodicalId":23522,"journal":{"name":"Ultrasonics","volume":"148 ","pages":"Article 107554"},"PeriodicalIF":3.8,"publicationDate":"2024-12-12","publicationTypes":"Journal Article","fieldsOfStudy":null,"isOpenAccess":false,"openAccessPdf":"","citationCount":null,"resultStr":null,"platform":"Semanticscholar","paperid":"142855471","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}

引用次数: 0