Article
Acoustics
Chi-Man Wong, Siu-Fan Chan, Wei Chang Wu, Chun-Hung Suen, Hei-Man Yau, Dan Yang Wang, Sean Li, Ji Yan Dai
Summary: A high compression fabrication method is presented in this article to tune the acoustic impedance of alumina-epoxy composite matching layer from 6.50 to 9.47 MRayl by controlling pressure and component ratios. The enhanced performance of this matching material, with very high acoustic impedance value and very low attenuation, makes it superior to all reported matching materials.
Article
Chemistry, Analytical
Ke Zhu, Jinpeng Ma, Xudong Qi, Bingzhong Shen, Yang Liu, Enwei Sun, Rui Zhang
Summary: This work presents the design and fabrication of an anisotropic gradient acoustic impedance composite material as a matching layer for ultrasonic transducers, which achieves almost perfect sound energy transfer efficiency by gradually decreasing the acoustic impedance along the direction of ultrasonic propagation. By using this new material as a matching layer, it has the potential to significantly improve the resolution and imaging quality of biomedical ultrasound imaging systems.
Article
Chemistry, Analytical
Taemin Lee, Joontaek Jung, Sang-Mok Lee, Jongcheol Park, Jae-Hyeong Park, Kyung-Wook Paik, Hyunjoo J. Lee
Summary: In this study, a flexible printed circuit board (FPCB) is developed and demonstrated as a novel acoustic matching layer for ultrasound transducers. The FPCB not only provides excellent acoustic performance, but also achieves high-quality electrical connections and transmission performance.
Article
Acoustics
Jianxin Zhao, Zhaoxi Li, Chunlong Fei, Chenxue Hou, Danfeng Wang, Lifei Lou, Dongdong Chen, Di Li, Zeyu Chen, Yintang Yang
Summary: A novel composite matching layer with gradient acoustic impedance is proposed in this study, which significantly improves the quality of ultrasound imaging. By applying this matching layer on ultrasonic transducers, efficient impedance matching and ultra-wide bandwidth can be achieved, leading to enhanced imaging performance.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Article
Nanoscience & Nanotechnology
Lianchun Li, Yifan Diao, Haijun Wu, Weikang Jiang
Summary: This study proposes a phase-modulated complementary acoustic metamaterial based on the principle of impedance matching, enabling ultrasound penetration through bone. Using 3D printing, the bone aberrations can be corrected by adjusting the ultrasound layer. Experimental and simulation results demonstrate that the proposed acoustic metamaterial improves the transmission efficiency of ultrasound through the aberration layer.
ACS APPLIED MATERIALS & INTERFACES
(2022)
Article
Acoustics
Smitha Shetty, Prapassorn Numkiatsakul, Kevin Wickline, Regina Incarnato, Haifeng Wang, Hal Kunkel, Clive A. Randall, Susan Trolier-McKinstry
Summary: A family of three phase polymer-ceramic-metal electrically conducting composites were developed using cold sintering for acoustic matching in medical ultrasound transducers. The composites exhibited a range of acoustic impedance, high density, and low attenuation. Additionally, non-conducting low impedance materials were achieved and the scaling of the composites was demonstrated.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Article
Chemistry, Analytical
Hojong Choi
Summary: High-frequency ultrasound transducers have higher spatial resolution but lower sensitivity than low-frequency ultrasound transducers. Matching circuits are used to increase the amplitude of high-frequency ultrasound transducers, while pre-matching circuits improve the amplitude and bandwidth of these transducers.
Article
Acoustics
Grigorii D. Slinkov, Sergey N. Mantsevich, Vladimir I. Balakshy, Leonid N. Magdich
Summary: This study examines the frequency dependency of a standing-wave acousto-optic device on its electrical impedance matching circuit parameters and configuration, aiming to expand its applicability domain.
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
(2022)
Article
Chemistry, Analytical
Sean Toffessi Siewe, Samuel Calle, Francois Vander Meulen, Damien Valente, Jean-Marc Gregoire, Aline Banquart, Stephanie Chevalliot, Arnaud Capri, Franck Levassort
Summary: Tailored backings with high acoustic impedance and strong attenuation are needed for miniaturized high-frequency transducer design. The use of multiphasic metallic backings in this study has shown promising results in terms of sensitivity and bandwidth for imaging applications.
Article
Nanoscience & Nanotechnology
Tiantian Chen, Jie Chen, Zhenyu Yi, Congqin Zheng, Linming Zhou, Yongjun Wu, Feiyan Cai, Jiale Qin, Zijian Hong, Yuhui Huang
Summary: Transcranial ultrasound imaging and therapy are noninvasive, radiation-free, and portable, but the presence of the skull hinders ultrasound transmission. To address this, researchers have proposed a novel approach involving a flexible matching layer to enhance ultrasound transmission through the skull.
ACS APPLIED MATERIALS & INTERFACES
(2023)
Article
Nanoscience & Nanotechnology
Ku Im, Q-Han Park
Summary: The mechanism of perfect anti-reflection for acoustic waves is presented using nonlocal metamaterials to compensate for impedance mismatch. The characteristics of spatio-temporal dispersion are analyzed and the issue of total internal reflection is addressed. The practical design of the nonlocal layer using metamaterials is explained, and its omni-directional frequency-independent behavior is confirmed through numerical calculations.
Article
Acoustics
Jiacong Bian, Yan Wang, Zhenjun Liu, Mingjie Shen, Hui Zhao, Yilai Sun, Jianjun Zhu
Summary: By studying and experimenting with the acoustic gradient impedance matching layer transducer, the problem of bandwidth expansion of traditional transducers has been successfully solved, improving the imaging resolution of sonar systems in marine environments.
Article
Engineering, Electrical & Electronic
Zhijian Liang, Jie Yuan
Summary: The introduced RF energy harvesting system achieves high sensitivity and efficiency over a wide input power range by optimizing the rectifier and load. The dual-band design explores frequency diversity to harvest more RF energy, while the cross-shaped antenna array utilizes space diversity to collect RF energy from different directions in a compact size.
IEEE TRANSACTIONS ON MICROWAVE THEORY AND TECHNIQUES
(2022)
Article
Materials Science, Ceramics
Lei Zhang, N. Stalin, Ngo Tran, Sadok Mehrez, Mohamed Fathy Badran, V. Mohanavel, Qiang Xu
Summary: Due to the widespread use of wireless communication and electronic devices, electromagnetic radiation has become a global environmental pollutant. In this study, 3D architectures of CoFe2O4 and polypyrrole were successfully fabricated as microwave absorbers. The microwave dissipation features of double-layer absorbers showed better performance compared to single-layer absorbers, attributed to better impedance matching capability and coupling interaction.
CERAMICS INTERNATIONAL
(2022)
Article
Engineering, Multidisciplinary
Jiaqi Li, Wenchang Huang, Weiwei Shao, Xiangxin Li, Zhitian Shen, Jie Xu, Jun Shen, Yaoyao Cui
Summary: A dual-frequency electrical impedance matching method is proposed in the study to improve the sensitivity quality of the transducer. By selecting a specific matching structure, the impedance of two frequencies can be independently matched to increase the amplitudes of high-frequency and low-frequency echoes simultaneously, resulting in better quality images.
Article
Acoustics
Maxwell J. Kiernan, Rashid Al Mukaddim, Carol C. Mitchell, Jenna Maybock, Stephanie M. Wilbrand, Robert J. Dempsey, Tomy Varghese
Summary: In this study, a method for automatically determining bounding boxes and lumen segmentation using a Mask R-CNN network trained on sonographer assisted groundtruth carotid lumen segmentations is presented. This method is of great importance for analyzing ultrasound images that require time and labor, and it also lays the foundation for developing accurate plaque segmentation and wall thickness measurement methods.
Article
Acoustics
Junzhen Wang, Jianmin Qu
Summary: This article presents the solution to guided wave fields in a double-layer plate and proposes a nonlinear spring-interface model for the bonding between the two sublayers. The study finds that the nonlinearity of the spring-interface can generate resonant guided waves in the double-layer plate, providing a theoretical foundation for the development of nondestructive evaluation techniques using nonlinear guided waves.
Article
Acoustics
Shuyuan Ye, Tianyu Peng, Zhili Long, Zhiming Jiang, Xiangqing Li, Zhonghua Cao
Summary: In this study, a novel approach based on beating vibration model is proposed for frequency tracking, which accurately determines the resonant frequency of the transducer in a short time.
Article
Acoustics
Shuling Gao, Rui Zhang, Zheng Fan, Ning Li, Yanan Yue, Lili Xie
Summary: In this study, a novel method is proposed to monitor fatigue damage in welded joints by computing the energy density in the diffuse ultrasonic signal. The results indicate that the correlation coefficient of the energy density exhibits a significant decreasing trend when crack initiation occurs, providing a unique signal to indicate crack initiation in welded joints.
Article
Acoustics
Ata Jafarzadeh, Peter D. Folkow, Anders Bostrom
Summary: This study investigates the scattering of elastic waves by an anisotropic sphere with orthorhombic symmetry inside an isotropic medium, and applies it to the characterization of polycrystalline materials with anisotropic grains. The expansion coefficients of the wave and displacement field are determined inside the sphere using recursion relations and boundary conditions. The T matrix elements are then obtained and used to analyze the attenuation and phase velocity of polycrystalline materials, particularly at low frequencies. The proposed approach shows good agreement with previous results and finite element method for strongly anisotropic materials.
Article
Acoustics
F. R. Akhmedzhanov, M. I. Elboeva, S. Z. Mirzaev
Summary: The dependence of elastic and acousto-optic properties on the direction of wave vector and polarization of acoustic and optical waves in lead molybdate crystals has been investigated. Effective photoelastic constants were determined using the Dixon method for different geometries of Bragg light diffraction. The study of the acousto-optic quality factor dependence on the direction of the wave vector of longitudinal acoustic waves in the symmetry plane revealed that the maximum and minimum values are observed when light is diffracted by pure longitudinal waves in this plane. Additionally, it was found that the acousto-optic quality factor in lead molybdate crystals is practically the same as in paratellurite crystals.
Article
Acoustics
H. Franklin
Summary: This paper investigates the interaction between double porosity distributed cylindrical bodies and the surrounding fluid using a generalized self consistent method. The study reveals that there is a correlation between the propagating waves and the effective quantities at low frequencies, which is influenced by the volume fraction of scatterers and the porosity.
Article
Acoustics
Yuchen Liu, Mahshid Hafezi, Andrew Feeney
Summary: This study investigates the use of Nitinol, a shape memory alloy, in a Langevin power ultrasonic transducer to mitigate the influence of temperature on device performance. The results demonstrate that by controlling the microstructure of Nitinol, the nonlinear softening of the piezoelectric stack can be reduced, leading to higher and more stable vibration amplitudes. Furthermore, the use of Nitinol allows for stable resonance frequency and performance even with temperature changes and continuous operation.
Article
Acoustics
Shrutika Sharma, Vishal Gupta, Deepa Mudgal
Summary: Poly Lactic Acid (PLA) based bone plates fabricated using Fused Deposition Modeling can have improved mechanical strength by biocompatible polydopamine (PDM) coating. The effect of ultrasonic assisted coating parameters on tensile strength of coated bone plates was investigated and compared using Response Surface Methodology (RSM) and machine learning (ML) models. The gradient boosting regression (GBReg) model outperformed other models in terms of accuracy and prediction performance for predicting the tensile strength of PDM coated bone plates.
Article
Acoustics
Kirill Kolesnik, Vijay Rajagopal, David J. Collins
Summary: Superstrate-based acoustofluidic devices offer advantages of cost, interchangeability and prevention of contamination between samples. This study analyzes the coupling layers and superstrate dimensions for efficient sound transmission, finding that a superstrate thickness of 0.55 times the acoustic wavelength maximizes acoustic coupling.
Article
Acoustics
Dingpeng Wang, Xiaocen Wang, Shili Chen, Jian Li, Lin Liang, Yang Liu
Summary: This paper proposes an end-to-end ultrasonic guided wave joint learning imaging method for sparse and limited-view transducer arrays, which significantly improves the quality of imaging results by integrating sparse feature reconstruction and deep learning imaging methods.
Article
Acoustics
Zubeir M. Ebrahim Saib, Anthony J. Croxford, Bruce W. Drinkwater
Summary: This paper proposes a numerical model using FDTD scheme to solve the nonlinear elastic bulk wave equations, aiming to better understand nonlinear ultrasonic techniques. The model considers material and geometrical nonlinearities and uses a stress-type boundary condition for excitation. Simulation and experimental results validate the effectiveness of the model.
Article
Acoustics
Sol R. Martinez, Emmanuel Odella, Luis E. Ibarra, Arianna Sosa Lochedino, Ana B. Wendel, Andres M. Durantini, Carlos A. Chesta, Rodrigo E. Palacios
Summary: Sonodynamic inactivation (SDI) has an advantage over optical excitation-based protocols due to the deeper penetration of ultrasound (US) excitation. In this study, we applied conjugated polymer nanoparticles (CPNs) as an efficient sonosensitizer (SS) in SDI of pathogens and characterized the sonoreactor. We found that CPNs have a germicidal effect on planktonic cultures and mature biofilms, highlighting their potential for novel inactivation protocols.
Article
Acoustics
Quentin Baudis, Tony Valier-Brasier, Regis Wunenburger
Summary: In this study, we present a detailed procedure for measuring the rheological properties of soft, highly attenuating, visco-elastic materials at ultrasonic frequencies. We use a crosslinked Polyurethane (PU) elastomer as an example and determine its complex longitudinal modulus M and shear modulus G as a function of frequency and temperature. The results show that M, G, and bulk modulus K obey the time-temperature superposition principle and can be accurately described using a fractional derivative rheological model.
Article
Acoustics
Richard E. Jacob, Matthew S. Prowant, Chris A. Hutchinson
Summary: Ultrasonic inspection of cast austenitic stainless steel (CASS) in the nuclear industry is challenging due to sound field scatter and attenuation caused by the coarse-grained microstructure. Modeling and simulation are important tools for addressing key aspects of inspections, but developing a useful and reliable CASS model is challenging. This study demonstrates a method of creating a realistic CASS model and compares it with laboratory-measured sound fields, showing promising results.
