Article
Construction & Building Technology
Zachary W. Coleman, Anton K. Schindler
Summary: In this study, a procedure for interpreting impact-echo data in an automated, simple manner for detecting defects in concrete bridge decks is presented. The developed procedure relies on statistical analysis of the data to identify frequency thresholds distinguishing sound concrete from defective concrete. The accuracy of this method was validated using case studies, and it showed high predictive capabilities for detecting different types of defects.
ACI MATERIALS JOURNAL
(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
Engineering, Electrical & Electronic
Zhili Long, Heng Zhao, Huiyu Peng, Mian Yao, Yifan Pan, Zuohua Li
Summary: With the advantages of non-contact, compatibility, no chemical effect and safety, acoustic levitation has great potential in various fields such as chemistry, biology, medicine and micro robotics. This study presents a relatively simple suspension device using a one-sided spherical transducer array to levitate large and multi-particles. Experimental results confirm the feasibility and correctness of this acoustic levitation method.
IEEE SENSORS JOURNAL
(2022)
Article
Instruments & Instrumentation
Kyungjun Song, Jun-Hyuk Kwak, Jong Jin Park, Shin Hur
Summary: Air-coupled ultrasonic techniques are useful for various applications, but impedance matching between air and piezoelectric materials can be a technical limitation. To improve this, acoustic metasurfaces are utilized to enhance impedance matching and achieve a broadband sound pressure level gain.
SMART MATERIALS AND STRUCTURES
(2021)
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
Engineering, Electrical & Electronic
Wei Tian, Lei Wang, Jiawen Yu, Yuan Lv, Shuhao Zhang, Qianming Xu, Bing Gao
Summary: This article proposes a hybrid impedance matching network (HIMN) combining passive impedance matching and active impedance matching, which can improve the matching frequency range and reduce matching delay. The impedance model of the UAT is proposed, and the matching principle of the HIMN is analyzed. A control method based on reference signal synchronization is proposed to reduce the matching delay of the system. The simulation and experimental results verify the effectiveness of the proposed HIMN and control algorithm, showing a wider matching frequency range and shorter matching delay.
IEEE TRANSACTIONS ON POWER ELECTRONICS
(2023)
Article
Nanoscience & Nanotechnology
Zhandong Huang, Zhipeng Zhao, Shengdong Zhao, Xiaobing Cai, Yiyuan Zhang, Zheren Cai, Huizeng Li, Zheng Li, Meng Su, Chuanzeng Zhang, Yaozong Pan, Yanlin Song, Jun Yang
Summary: The instability of acoustic metamaterials at interfaces and their subwavelength characteristics pose challenges to wide-angle water-air acoustic transmission, but the lotus leaf acoustic metasurface has shown promising results in enhancing acoustic transmission and enabling various applications.
ACS APPLIED MATERIALS & INTERFACES
(2021)
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
Engineering, Electrical & Electronic
Chunyuan Yang, Shuhao Zhang, Lei Wang, Wei Tian, Jie Zou, Chi Yang, Zehua Lin
Summary: This paper proposes an optimization design for LCCLC impedance matching network based on the improved chaos optimization algorithm and the corresponding equalization control strategy. By establishing the impedance model of UAT and analyzing the matching principle of LCCLC network, the optimization design for LCCLC network is detailedly described, and a control method based on the FIR filter principle is proposed to solve the calculation problem of the command signal. The proposed methods are verified by an experimental platform, showing successful solutions to the matching and emission problems.
IET POWER ELECTRONICS
(2023)
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
Computer Science, Information Systems
Yongchao Yao, Baohai Tan, Zhanxiang He, Xianping Liu
Summary: In this study, an electrical impedance matching (EIM) method for piezoelectric transducer is proposed based on Butterworth response and network theory. The method can broaden the bandwidth of narrowband transducers while ensuring stable transducer power gain (TPG).
Article
Physics, Multidisciplinary
Sai Zhang, Guodong Hao, Xinsa Zhao, Yexin Liu, Jianning Han
Summary: This work proposes a phononic crystal gradient metamaterial structure (PCGMs) for the enhancement and directional sensing of weak target acoustic signals using the strong wave compression effect and equivalent medium theory. Compared to conventional gradient structures, PCGMs exhibit superior acoustic enhancement performance and wider range of acoustic response capability. Numerical analysis and experimental validation consistently demonstrate that PCGMs can effectively enhance the target frequency signals in harmonic signals, breaking through the detection limit of acoustic sensing systems and providing a great method for engineering applications of weak acoustic signal perception.
FRONTIERS IN PHYSICS
(2023)
Article
Instruments & Instrumentation
Xiuquan Li, Lin Chen, Hongbing Chen, Qingzhao Kong
Summary: Piezoceramic-based ultrasonic transducers have shown the feasibility and effectiveness in detecting damages in concrete structures, but are limited by energy loss and propagation distance. To address this, the authors propose a high-performance piezoceramic-enabled SA based on acoustic impedance matching. Experimental comparisons and field tests demonstrate the improved performance and potential in large infrastructure engineering applications.
SMART MATERIALS AND STRUCTURES
(2023)
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)