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Journal articles on the topic 'Ultrasonic transducer arrays'

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1

Okamoto, Kyoka, and Kan Okubo. "Arrangement design for horizontally omnidirectional audible sound source using facing ultrasonic transducer arrays." Japanese Journal of Applied Physics 61, SG (2022): SG1028. http://dx.doi.org/10.35848/1347-4065/ac4c09.

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Abstract We developed an audible sound source with horizontal omnidirectional patterns using facing ultrasonic transducer arrays. The arrays emitted sound with different ultrasonic frequencies from each side, and an audible sound with a differential frequency is generated between input ultrasonic signals. In particular, we designed and created a new array that can control the number of transducers driven in the array. We evaluated the frequency–amplitude characteristics and directivity when the transducers in the array were driven in an annular shape. There is an optimum array shape and number
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2

Liu, Zi Hong, Jia Wen Jia, and Gang Xiong. "Research of the Design and Simulation of Ultrasonic Focusing System with Phased Array." Applied Mechanics and Materials 620 (August 2014): 162–65. http://dx.doi.org/10.4028/www.scientific.net/amm.620.162.

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At present, the most common way of ultrasonic focusing is concave spherical self-focusing, ultrasonic focusing on lens and phased array ultrasonic focusing. Phased array ultrasonic focusing system is made up by multiple independent transducer unit array, according to the specific way and timing, real-time control of different arrays of ultrasonic signal phase. Established the ideal point source consisting of piezoelectric transducer phased array model 4 * 4 by the use of COMSOL, and results got the phased array focused in the simulation experiments.
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3

Titov, V. Yu. "INVESTIGATION PARAMETERS ULTRASONIC DEVICE ON PHASED ARRAYS. FOCUSING MODES FOR ULTRASONIC DEVICE TYPE OF OMNISCAN." Kontrol'. Diagnostika, no. 278 (August 2021): 24–35. http://dx.doi.org/10.14489/td.2021.08.pp.024-035.

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The article is devoted to possibilities of regular focusing of Omniscan device on phased arrays. Questions are raised about evaluation of testing results when using linear and sector scan-ning with different focus parameters. The question of size near-field for phased arrays and asso-ciated choice of focus mode is discussed. The article is based on experiments conducted on samples with artificial reflectors at the same size, but different in type: a non-directional reflector (a side-drill hole) and a directional reflector (a flat-bottomed reflector), located at the same depth. The study was co
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4

Manthey, W., N. Kroemer, and V. Magori. "Ultrasonic transducers and transducer arrays for applications in air." Measurement Science and Technology 3, no. 3 (1992): 249–61. http://dx.doi.org/10.1088/0957-0233/3/3/001.

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5

Wang, Xu-Bo, Le-Ming He, You-Cao Ma, et al. "Development of Broadband High-Frequency Piezoelectric Micromachined Ultrasonic Transducer Array." Sensors 21, no. 5 (2021): 1823. http://dx.doi.org/10.3390/s21051823.

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Piezoelectric micromachined ultrasonic transducers (PMUT) are promising elements to fabricate a two-dimensional (2D) array with a pitch small enough (approximately half wavelength) to form and receive arbitrary acoustic beams for medical imaging. However, PMUT arrays have so far failed to combine the wide, high-frequency bandwidth needed to achieve a high axial resolution. In this paper, a polydimethylsiloxane (PDMS) backing structure is introduced into the PMUTs to improve the device bandwidth while keeping a sub-wavelength (λ) pitch. We implement this backing on a 16 × 8 array with 75 µm pit
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6

Kim, Jinwook, Jinwoo Kim, and Juwon Kang. "Advances in Langevin Piezoelectric Transducer Designs for Broadband Ultrasonic Transmitter Applications." Actuators 14, no. 7 (2025): 355. https://doi.org/10.3390/act14070355.

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Langevin ultrasonic transducers, also known as Tonpilz transducers, are widely used in high-power ultrasonic applications, including underwater sonar arrays, ultrasonic cleaning, and sonication devices. Traditionally designed for narrowband operation centered on a fundamental longitudinal resonance mode, their performance has been limited by structural constraints that tie resonance frequency to overall transducer length and mass. However, technical demands in biomedical, industrial, and underwater technologies have driven the development of broadband Langevin transducers capable of operating
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7

Li, Wentao, Zhenggan Zhou, and Yang Li. "Application of Ultrasonic Array Method for the Inspection of TC18 Addictive Manufacturing Titanium Alloy." Sensors 19, no. 20 (2019): 4371. http://dx.doi.org/10.3390/s19204371.

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Ultrasonic arrays have been investigated for inspecting the quality of special materials. Unfortunately, non-destructive testing and evaluation (NDT&E) of internal defects in additive manufacturing (AM) materials are difficult due to the anisotropy and the coarse grain. To solve the problem, this paper brings forward research on the inspection of TC18 AM titanium alloy products using an ultrasonic array. Firstly, a three-dimensional acoustic field distribution of different ultrasonic array transducers is established to design an optimal detection solution for an AM titanium alloy. Then, a
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8

Chen, Zeyu, Xuejun Qian, Xuan Song, et al. "Three-Dimensional Printed Piezoelectric Array for Improving Acoustic Field and Spatial Resolution in Medical Ultrasonic Imaging." Micromachines 10, no. 3 (2019): 170. http://dx.doi.org/10.3390/mi10030170.

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Piezoelectric arrays are widely used in non-destructive detecting, medical imaging and therapy. However, limited by traditional manufacturing methods, the array’s element is usually designed in simple geometry such as a cube or rectangle, restricting potential applications of the array. This work demonstrates an annular piezoelectric array consisting of different concentric elements printed by Mask-Image-Projection-based Stereolithography (MIP-SL) technology. The printed array displays stable piezoelectric and dielectric properties. Compared to a traditional single element transducer, the ultr
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9

Opieliński, Krzysztof J., Piotr Pruchnicki, and Tadeusz Gudra. "Ultrasonic Mammography with Circular Transducer Array." Archives of Acoustics 39, no. 4 (2015): 559–68. http://dx.doi.org/10.2478/aoa-2014-0060.

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Abstract Ultrasonic projection imaging is similar to X-ray radiography. Nowadays, ultrasonic projection methods have been developed in the set-up of multi-element flat arrays with miniature transducers, where one of the array acts as a transmitter and the other one is a receiver. In the paper, a new method of the projection imaging using a 1024-element circular ultrasonic transducer array is presented. It allows the choice of a projection scanning plane for any angle around a studied object submerged in water. Fast acquisition of measurement data is achieved as a result of parallel switching o
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10

Celmer, Mateusz, and Krzysztof J. Opieliński. "Research and Modeling of Mechanical Crosstalk in Linear Arrays of Ultrasonic Transducers." Archives of Acoustics 41, no. 3 (2016): 599–612. http://dx.doi.org/10.1515/aoa-2016-0058.

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Abstract Linear arrays of ultrasonic transducers are commonly used as ultrasonic probes in medical diagnostics for imaging the interior of a human body in vivo. The crosstalk phenomenon occurs during the operation of transducers in which electrical voltages and mechanical vibrations are transmitted to adjacent components. As a result of such additional excitation of the transducers in the array, the directivity characteristics of the aperture used changes, and consequently there is interference with properoperation of a given array and the emergence of distortions in the obtained ultra sound i
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11

Chen, Jingqi, Hanzhang Liu, Xiaoduo Zhang, Hui Li, and Feng Yin. "A Miniature PMUT Array for Medical Applications." Journal of Physics: Conference Series 2822, no. 1 (2024): 012161. http://dx.doi.org/10.1088/1742-6596/2822/1/012161.

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Abstract Wearable continuous monitoring technology and internal and cerebrovascular imaging are the frontier hot area of current scientific research, which are of great significance to improving human life and health. Ultrasonic imaging can obtain information such as deep tissue structure by transmitting ultrasonic waves into the tissue and detecting echo signals, and ultrasonic imaging technology has the advantages of high imaging depth, high resolution, high safety, fast and convenient, etc. It is one of the important technologies in the medical field such as wearable continuous monitoring t
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12

Zhang, Chi, Jing Ren, and Chuang Shi. "Sub-array equalization technique for the parametric array loudspeaker to reduce nonlinear distortion." INTER-NOISE and NOISE-CON Congress and Conference Proceedings 263, no. 5 (2021): 1497–504. http://dx.doi.org/10.3397/in-2021-1856.

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The parametric array loudspeaker (PAL) is a directional loudspeaker which uses the nonlinear acoustic effect, namely the parametric array, to produce an audio beam from narrow ultrasonic beams. The PAL can efficiently deliver audible information, without generating noise to the surroundings. One significant drawback of the PAL is the nonlinear distortion. Therefore, many sophisticated methods have been proposed to preprocess the input signal of the PAL. However, those methods usually request a flat frequency response of the ultrasonic transducer array (UTA). In the past, equalization has been
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13

Smith, S. W. "Multi-layer composite ultrasonic transducer arrays." Journal of the Acoustical Society of America 105, no. 1 (1999): 28. http://dx.doi.org/10.1121/1.424708.

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14

Wang, Shuai, Xuewei Wang, Fucheng You, and Han Xiao. "Review of Ultrasonic Particle Manipulation Techniques: Applications and Research Advances." Micromachines 14, no. 8 (2023): 1487. http://dx.doi.org/10.3390/mi14081487.

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Ultrasonic particle manipulation technique is a non-contact label-free method for manipulating micro- and nano-scale particles using ultrasound, which has obvious advantages over traditional optical, magnetic, and electrical micro-manipulation techniques; it has gained extensive attention in micro-nano manipulation in recent years. This paper introduces the basic principles and manipulation methods of ultrasonic particle manipulation techniques, provides a detailed overview of the current mainstream acoustic field generation methods, and also highlights, in particular, the applicable scenarios
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15

Emery, Charles D., H. C. Casey, and Stephen W. Smith. "Ultrasonic Imaging Using Optoelectronic Transmitters." Ultrasonic Imaging 20, no. 2 (1998): 113–31. http://dx.doi.org/10.1177/016173469802000203.

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Conventional ultrasound scanners utilize electronic transmitters and receivers at the scanner with a separate coaxial cable connected to each transducer element in the handle. The number of transducer elements determines the size and weight of the transducer cable assembly that connects the imaging array to the scanner. 2-D arrays that allow new imaging modalities to be introduced significantly increase the channel count making the transducer cable assembly more difficult to handle. Therefore, reducing the size and increasing the flexibility of the transducer cable assembly is a concern. Fiber
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16

SCHMMER, LESTER W. "FUNDAMENTALS OF ULTRASONIC PHASED ARRAYS." Modern Physics Letters B 22, no. 11 (2008): 917–21. http://dx.doi.org/10.1142/s0217984908015607.

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It is shown that the wave field of an ultrasonic linear array is closely related to that of an equivalent single element transducer. Using this relationship, it is demonstrated how one can construct a simple and efficient ultrasonic beam model for the wave field of a steered linear array.
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17

Paeng, Dong Guk, Hyung Ham Kim, Sang Goo Lee, Sung Min Rhim, and Min Joo Choi. "Fabrication of a 40 MHz Single Element Ultrasonic Transducer Using a PMN-PT Single Crystal." Key Engineering Materials 321-323 (October 2006): 978–83. http://dx.doi.org/10.4028/www.scientific.net/kem.321-323.978.

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PMN-PT, a piezoelectric single crystal, has been known to be a better material for transducer arrays due to its high electromechanical coupling coefficient (k33) and high dielectric and piezoelectric constants. It may also be good even for high frequency single element transducers using relatively high kt and low attenuation and velocity dispersion. However, it’s challenging to fabricate high frequency transducers using PMN-PT since it is easily breakable and requires small area and thickness of the transducer. A KLM model was used to simulate a 40 MHz single element transducer including 2 mat
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18

Liu, Tao, Zhihao Li, Jiahuan Zhang, et al. "A Gas Flow Measurement System Based on Lead Zirconate Titanate Piezoelectric Micromachined Ultrasonic Transducer." Micromachines 15, no. 1 (2023): 45. http://dx.doi.org/10.3390/mi15010045.

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Ultrasonic flowmeter is one of the most widely used devices in flow measurement. Traditional bulk piezoelectric ceramic transducers restrict their application to small pipe diameters. In this paper, we propose an ultrasonic gas flowmeter based on a PZT piezoelectric micromachined ultrasonic transducer (PMUT) array. Two PMUT arrays with a resonant frequency of 125 kHz are used as the sensitive elements of the ultrasonic gas flowmeter to realize alternate transmission and reception of ultrasonic signals. The sensor contains 5 × 5 circular elements with a size of 3.7 × 3.7 mm2. An FPGA with a res
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19

Wang, Ziyuan, Changde He, Wendong Zhang, et al. "Fabrication of 2-D Capacitive Micromachined Ultrasonic Transducer (CMUT) Array through Silicon Wafer Bonding." Micromachines 13, no. 1 (2022): 99. http://dx.doi.org/10.3390/mi13010099.

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Capacitive micromachined ultrasound transducers (CMUTs) have broad application prospects in medical imaging, flow monitoring, and nondestructive testing. CMUT arrays are limited by their fabrication process, which seriously restricts their further development and application. In this paper, a vacuum-sealed device for medical applications is introduced, which has the advantages of simple manufacturing process, no static friction, repeatability, and high reliability. The CMUT array suitable for medical imaging frequency band was fabricated by a silicon wafer bonding technology, and the adjacent
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20

Fraser, John Douglas. "Hex packed two dimensional ultrasonic transducer arrays." Journal of the Acoustical Society of America 112, no. 6 (2002): 2525. http://dx.doi.org/10.1121/1.1536535.

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21

Bybi, Abdelmajid, Driss Khouili, Christian Granger, Mohammed Garoum, Ahmed Mzerd, and Anne-Christine Hladky-Hennion. "Experimental Characterization of A Piezoelectric Transducer Array Taking into Account Crosstalk Phenomenon." International Journal of Engineering and Technology Innovation 10, no. 1 (2020): 01–14. http://dx.doi.org/10.46604/ijeti.2020.4348.

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Ultrasonic transducer arrays are generally composed of several piezoelectric elements arranged in 1D or 2D ways. Crosstalk is an undesirable phenomenon decreasing the performance of these devices. It generates parasitic displacements at the elements' radiating surfaces, which changes the directivity of the array. Furthermore, the transducer's displacement plays a critical role in terms of the focal area and transferred intensities. The objective of this paper is to characterize a piezoelectric array composed of seven-elements made of PZ 27 ceramic experimentally. It investigates the effects of
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22

Jiang, Xue-Jiao, Meng-Wei Liu, Fang-Fang Shi, Wen Wang, Xian-Mei Wu, and Jia-Yi Chen. "A Microscale Linear Phased-Array Ultrasonic Transducer Based on PZT Ceramics." Sensors 19, no. 5 (2019): 1244. http://dx.doi.org/10.3390/s19051244.

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In this paper, a microscale high-frequency ultrasonic transducer was prepared by combining traditional planar ultrasonic phased-array technology and micro processing technology. The piezoelectric ceramic material PZT was used as the functional material of the transducer. The number of the arrays was 72, the width of each array was 50 μm, the pitch of each array was 70 μm, and the length of each array was 3 mm. The PZT chip was finely ground to a thickness of 130 μm and could reach a frequency of 10 MHz. The experimental platform of micron-scale precision was set up for a beam-forming lateral s
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23

Liu, Ya-Han, Hsin-Yi Su, Hsiao-Chi Lin, Chih-Ying Li, Yeong-Her Wang, and Chih-Hsien Huang. "Investigation of Achieving Ultrasonic Haptic Feedback Using Piezoelectric Micromachined Ultrasonic Transducer." Electronics 11, no. 14 (2022): 2131. http://dx.doi.org/10.3390/electronics11142131.

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Ultrasound haptics is a contactless tactile feedback method that creates a tactile sensation by focusing high-intensity ultrasound on human skin. Although air-coupled ultrasound transducers have been applied to commercial products, the existing models are too bulky to be integrated into consumer electronics. Therefore, this study proposes a piezoelectric micromachined ultrasonic transducer (pMUT) with a small size and low power consumption to replace traditional transducers. The proposed pMUT has a resonance frequency of 40 kHz and a radius designed through the circular plate model and finite
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24

Celmer, Mateusz, and Krzysztof J. Opieliński. "Study of Crosstalk in Linear Ultrasonic Transducer Arrays." Acta Acustica united with Acustica 101, no. 1 (2015): 46–54. http://dx.doi.org/10.3813/aaa.918803.

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25

Johnson, Jeremy, Ömer Oralkan, Utkan Demirci, Sanlı Ergun, Mustafa Karaman, and Pierre Khuri-Yakub. "Medical imaging using capacitive micromachined ultrasonic transducer arrays." Ultrasonics 40, no. 1-8 (2002): 471–76. http://dx.doi.org/10.1016/s0041-624x(02)00161-0.

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26

Bybi, Abdelmajid, Ouadia Mouhat, Mohammed Garoum, Hilal Drissi, and Sébastien Grondel. "One-dimensional equivalent circuit for ultrasonic transducer arrays." Applied Acoustics 156 (December 2019): 246–57. http://dx.doi.org/10.1016/j.apacoust.2019.07.011.

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27

Wang, Junjie, Shaojie Li, Hui Zhang, and Zhuochen Wang. "An integrated multichannel system for air-coupled CMUT array imaging and guided wave detection applications." Journal of Physics: Conference Series 2822, no. 1 (2024): 012189. http://dx.doi.org/10.1088/1742-6596/2822/1/012189.

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Abstract Capacitive micromachined ultrasonic transducers (CMUTs) made by MEMS process have become a new choice for air-coupled ultrasonic transducers due to their high sensitivity, low acoustic impedance and easy arraying. At present, in the air coupling application of CMUT transducer, due to the weak signal strength of single element, the CMUT array usually works in a whole piece, limiting the advantage of the array. Therefore, a multi-channel air-coupled CMUT imaging system with high-voltage DC bias and low-noise high-gain current signal amplification is designed to realize the electronic sc
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28

Shang, Wenling, Danrui Wang, Bin Miao, et al. "Reconfigurable ScAlN Piezoelectric Micromachined Ultrasonic Transducer Arrays for Range Finding." Micromachines 16, no. 2 (2025): 145. https://doi.org/10.3390/mi16020145.

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Due to their compact sizes, low power consumption levels, and convenient integration capabilities, piezoelectric micromachined ultrasonic transducers (PMUTs) have gained significant attention for enabling environmental sensing functionalities. However, the frequency inconsistency of the PMUT arrays often leads to directional errors with the ultrasonic beams. Herein, we propose a reconfigurable PMUT array based on a Sc0.2Al0.8N piezoelectric thin film for in-air ranging. Each element of the reconfigurable PMUT array possesses the ability to be independently replaced, enabling matching of the re
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29

Massaad, Jack, Paul L. M. J. van Neer, Douwe M. van Willigen, Michiel A. P. Pertijs, Nicolaas de Jong, and Martin D. Verweij. "Algorithm to Correct Measurement Offsets Introduced by Inactive Elements of Transducer Arrays in Ultrasonic Flow Metering." Sensors 22, no. 23 (2022): 9317. http://dx.doi.org/10.3390/s22239317.

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Ultrasonic flow meters (UFMs) based on transducer arrays offer several advantages. With electronic beam steering, it is possible to tune the steering angle of the beam for optimal signal-tonoise ratio (SNR) upon reception. Moreover, multiple beams can be generated to propagate through different travel paths, covering a wider section of the flow profile. Furthermore, in a clamp-on configuration, UFMs based on transducer arrays can perform self-calibration. In this manner, userinput is minimized and measurement repeatability is increased. In practice, transducer array elements may break down. Th
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30

Kazys, Rymantas Jonas, Justina Sestoke, and Egidijus Zukauskas. "Numerical Investigation of Excitation of Various Lamb Waves Modes in Thin Plastic Films." Applied Sciences 12, no. 2 (2022): 849. http://dx.doi.org/10.3390/app12020849.

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Ultrasonic-guided waves are widely used for the non-destructive testing and material characterization of plates and thin films. In the case of thin plastic polyvinyl chloride (PVC), films up to 3.2 MHz with only two Lamb wave modes, antisymmetrical A0 and symmetrical S0, may propagate. At frequencies lower that 240 kHz, the velocity of the A0 mode becomes slower than the ultrasonic velocity in air which makes excitation and reception of such mode complicated. For excitation of both modes, we propose instead a single air-coupled ultrasonic transducer to use linear air-coupled arrays, which can
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31

Wang, Zhe, Chao Zhang, and Xiahui Li. "Research on factors affecting ultrasonic phased array detection imaging quality for curved component." AIP Advances 12, no. 6 (2022): 065114. http://dx.doi.org/10.1063/5.0090499.

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An in-depth analysis on the beam directivity of ultrasonic phased arrays has been made to solve the problems of low image quality and identification difficulties caused by a suboptimal configuration of array elements. The influence on the number and spacing of array elements on the imaging quality of curved components was studied. The simulation and experimental verification of the phased array sound field for curved components were carried out. The rules governing the influence of phased array transducer parameters on imaging quality were obtained, and an approach to the optimization of param
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32

MARTINEZ, O., L. G. ULLATE, and F. MONTERO. "COMPUTATION OF THE ULTRASONIC FIELD RADIATED BY SEGMENTED-ANNULAR ARRAYS." Journal of Computational Acoustics 09, no. 03 (2001): 757–72. http://dx.doi.org/10.1142/s0218396x01001327.

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A method for computing the ultrasonic field radiated from segmented annular arrays is presented. Using the well known convolution-impulse response approach, an analytical expression for the spatial impulse response velocity potential from a segmented annular transducer valid for all spatial points is obtained. The array field is then calculated by superposition. The proposed solution allows us to predict transient and continuous wave pressure fields from segmented annular arrays without requiring any far-field or paraxial approximation. In order to evaluate the proposed method, an analysis of
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33

Zhang, Zhen, Tian Hong Yan, Xue Dong Chen, Bo He, and Xin Sheng Xu. "The Design and Dynamic Analysis of High Frequency Ultrasonic Transducer for Wire Bonding Application." Applied Mechanics and Materials 226-228 (November 2012): 199–202. http://dx.doi.org/10.4028/www.scientific.net/amm.226-228.199.

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The ultrasonic transducer converts electrical energy into mechanical vibration, and its vibration characteristics have a great effect on the bonding quality. Bond grid arrays (BGA) application and the ability to decrease the temperature of the wire bonding process urgently demand higher bonding frequencies. The ultrasonic transducer working at 135 KHz has been designed, simulated and tested. Based on electromechanical equivalent circuit theory, the dimensions of the transducer were designed. Through finite element method (FEM), the dynamic characteristics of the transducer were investigated. T
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34

Fukumoto, Shintaro, and Takahiro Arakawa. "Development and Performance Comparison of a 64-Channel Annular Array Probe Excited Simultaneously by Shorted Symmetrically Positioned Elements." Sensors 25, no. 4 (2025): 1221. https://doi.org/10.3390/s25041221.

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Ultrasonic testing technology is used to inspect pipe welds in nuclear and thermal power plants. This paper proposes a new method to measure weld defects in thick-walled pipes of about 100 mm using ultrasonic phased array technology. The effectiveness of annular arrays is confirmed by numerical simulations, and element arrangements that enable point focusing and sector scanning are considered. The energy concentration of annular arrays is 7% higher than that of linear arrays and 3% higher than that of matrix arrays. Similarly, the sound pressure ratio of grating lobes is equivalent to that of
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35

Caronti, Alessandro, G. Caliano, R. Carotenuto, et al. "Capacitive micromachined ultrasonic transducer (CMUT) arrays for medical imaging." Microelectronics Journal 37, no. 8 (2006): 770–77. http://dx.doi.org/10.1016/j.mejo.2005.10.012.

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36

Gelly, JF, and JM Bureau. "Two-dimensional (2D) transducer arrays for medical ultrasonic imaging." RBM-News 20, no. 9 (1998): 243–46. http://dx.doi.org/10.1016/s0222-0776(99)80009-1.

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37

Lani, Shane W., M. Wasequr Rashid, Jennifer Hasler, Karim G. Sabra, and F. Levent Degertekin. "Capacitive micromachined ultrasonic transducer arrays as tunable acoustic metamaterials." Applied Physics Letters 104, no. 5 (2014): 051914. http://dx.doi.org/10.1063/1.4864635.

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38

Ziping, Wang, Xiong Xiqiang, Qian Lei, Wang Jiatao, Fei Yue, and Tian Maoyuan. "Research on the Progress of Interdigital Transducer (IDT) for Structural Damage Monitoring." Journal of Sensors 2021 (March 20, 2021): 1–10. http://dx.doi.org/10.1155/2021/6630658.

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In the application of Structural Health Monitoring (SHM) methods and related technologies, the transducer used for electroacoustic conversion has gradually become a key component of SHM systems because of its unique function of transmitting structural safety information. By comparing and analyzing the health and safety of large-scale structures, the related theories and methods of Structural Health Monitoring (SHM) based on ultrasonic guided waves are studied. The key technologies and research status of the interdigital guided wave transducer arrays which used for structural damage detection a
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39

Andersson, Carl. "Acoustic levitation of multi-wavelength spherical bodies using transducer arrays of non-specialized geometries." Journal of the Acoustical Society of America 151, no. 5 (2022): 2999–3006. http://dx.doi.org/10.1121/10.0010358.

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Recently, acoustic levitation of a wavelength-sized spherical object using a general-purpose ultrasonic transducer array was demonstrated. In this article, the possibility of extending the capabilities of such arrays to levitate multi-wavelength-sized objects is explored. The driving signals for the elements in the array are determined via numerical optimization of a physics-based cost function that includes components for trap stabilization. The cost function is balanced with an improved approach, mimicking dynamical de-weighting of the included components to avoid over-optimization of each i
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40

Massaad, Jack, Paul L. M. J. van Neer, Douwe M. van Willigen, Michiel A. P. Pertijs, Nicolaas de Jong, and Martin D. Verweij. "Measurement of Pipe and Liquid Parameters Using the Beam Steering Capabilities of Array-Based Clamp-On Ultrasonic Flow Meters." Sensors 22, no. 14 (2022): 5068. http://dx.doi.org/10.3390/s22145068.

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Clamp-on ultrasonic flow meters (UFMs) are installed on the outside of the pipe wall. Typically, they consist of two single-element transducers mounted on angled wedges, which are acoustically coupled to the pipe wall. Before flow metering, the transducers are placed at the correct axial position by manually moving one transducer along the pipe wall until the maximum amplitude of the relevant acoustic pulse is obtained. This process is time-consuming and operator-dependent. Next to this, at least five parameters of the pipe and the liquid need to be provided manually to compute the flow speed.
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Zhang, Wang, Weiliang Wu, Xiaoyi Sun, Li Xiao, and Wenzhong Qu. "Damage Detection of Closed Crack in a Metallic Plate Using Nonlinear Ultrasonic Time Reversal Method." Journal of Sensors 2013 (2013): 1–10. http://dx.doi.org/10.1155/2013/652743.

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Initial cracks in metallic structures incline to be closed at rest. Such incipient damage generally fails to be detected and located with traditional linear ultrasonic techniques because ultrasonic waves penetrate the contact area of the closed crack. In this paper, an imaging algorithm based on nonlinear ultrasonic time reversal method is proposed to detect closed cracks in aluminum plates. Two surface-bonded piezoelectric transducer arrays are used to generate, receive, and reemit ultrasonic wave signals. The closed crack is simulated by tightening a bolt on the aluminum plate. By applying l
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42

CIANCI, E. "One-dimensional capacitative micromachined ultrasonic transducer arrays for echographic probes." Microelectronic Engineering 73-74 (June 2004): 502–7. http://dx.doi.org/10.1016/s0167-9317(04)00201-1.

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Xuecheng Jin, O. Oralkan, F. L. Degertekin, and B. T. Khuri-Yakub. "Characterization of one-dimensional capacitive micromachined ultrasonic immersion transducer arrays." IEEE Transactions on Ultrasonics, Ferroelectrics and Frequency Control 48, no. 3 (2001): 750–60. http://dx.doi.org/10.1109/58.920706.

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Ohmaru, Makoto, Tomoki Yokoyama, Koichi Mizutani, and Keinosuke Nagai. "Transducer Arrays for Rapid Data Acquisition of Ultrasonic Diffraction Tomography." Japanese Journal of Applied Physics 35, Part 1, No. 5B (1996): 3139–43. http://dx.doi.org/10.1143/jjap.35.3139.

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45

Chen, Jingkuang. "Capacitive micromachined ultrasonic transducer arrays for minimally invasive medical ultrasound." Journal of Micromechanics and Microengineering 20, no. 2 (2010): 023001. http://dx.doi.org/10.1088/0960-1317/20/2/023001.

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Sternini, Simone, Albert Y. Liang, and Francesco Lanza di Scalea. "Ultrasonic synthetic aperture imaging with interposed transducer–medium coupling path." Structural Health Monitoring 18, no. 5-6 (2018): 1543–56. http://dx.doi.org/10.1177/1475921718805514.

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An interposed coupling material between an ultrasonic transducer and the test medium can be present in various non-destructive inspections and structural health monitoring imaging applications. One example is the wedge medium often used to direct ultrasonic beams into the test material for optimal interaction with internal defects. Another example is the ultrasonic imaging of multilayered structures. This article discusses the ways to perform synthetic aperture focus ultrasonic imaging in these cases where signal losses and complicated refractions at the coupling material/medium interface take
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Wodnicki, Robert, Haochen Kang, Di Li, et al. "Highly Integrated Multiplexing and Buffering Electronics for Large Aperture Ultrasonic Arrays." BME Frontiers 2022 (June 30, 2022): 1–22. http://dx.doi.org/10.34133/2022/9870386.

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Large aperture ultrasonic arrays can be implemented by tiling together multiple pretested modules of high-density acoustic arrays with closely integrated multiplexing and buffering electronics to form a larger aperture with high yield. These modular arrays can be used to implement large 1.75D array apertures capable of focusing in elevation for uniform slice thickness along the axial direction which can improve image contrast. An important goal for large array tiling is obtaining high yield and sensitivity while reducing extraneous image artifacts. We have been developing tileable acoustic-ele
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Brennan, Des, and Paul Galvin. "Evaluation of a Machine Learning Algorithm to Classify Ultrasonic Transducer Misalignment and Deployment Using TinyML." Sensors 24, no. 2 (2024): 560. http://dx.doi.org/10.3390/s24020560.

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The challenge for ultrasonic (US) power transfer systems, in implanted/wearable medical devices, is to determine when misalignment occurs (e.g., due to body motion) and apply directional correction accordingly. In this study, a number of machine learning algorithms were evaluated to classify US transducer misalignment, based on data signal transmissions between the transmitter and receiver. Over seven hundred US signals were acquired across a range of transducer misalignments. Signal envelopes and spectrograms were used to train and evaluate machine learning (ML) algorithms, classifying misali
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Golub, Mikhail V., Sergey I. Fomenko, Pavel E. Usov, and Artem A. Eremin. "Elastic Waves Excitation and Focusing by a Piezoelectric Transducer with Intermediate Layered Elastic Metamaterials with and without Periodic Arrays of Interfacial Voids." Sensors 23, no. 24 (2023): 9747. http://dx.doi.org/10.3390/s23249747.

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Optimization of the structure of piezoelectric transducers such as the proper design of matching layers can increase maximum wave energy transmission to the host structure and transducer sensitivity. A novel configuration of an ultrasonic transducer, where elastic metamaterial insertion is introduced to provide bulk wave mode conversion and to increase wave energy transfer into a substrate, is proposed. Configurations of layered elastic metamaterials with crack-like voids are examined theoretically since they can provide wide band gaps and strong wave localization and trapping. The analysis sh
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Brunskill, Henry, Andy Hunter, Lu Zhou, Rob Dwyer Joyce, and Roger Lewis. "An evaluation of ultrasonic arrays for the static and dynamic measurement of wheel–rail contact pressure and area." Proceedings of the Institution of Mechanical Engineers, Part J: Journal of Engineering Tribology 234, no. 10 (2020): 1580–93. http://dx.doi.org/10.1177/1350650120919889.

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The interfacial contact conditions between a railway vehicle wheel and the rail are paramount to the lifespan, safety and smooth operation of any rail network. The wheel–rail interface contact pressure and area conditions have been estimated, calculated and simulated by industry and academia for many years, but a method of accurately measuring dynamic contact conditions has yet to be realised. Methods using pressure-sensitive films and controlled air flow have been employed, but both are limited. Ultrasonic reflectometry is the term given to active ultrasonics in which an ultrasonic transducer
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