Results 11 to 20 of about 13,611 (164)
Simultaneously focusing electromagnetic and acoustic waves by double-physical-fields null medium
Frontiers in Materials, 2023 A novel double-physical-fields lens that can simultaneously focus acoustic and electromagnetic waves into a given region is designed based on double-physical-fields null medium, which can be realized by metal plates with subwavelength separations ...
Boyang Wu +10 more
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Sound Localization through Multi-Scattering and Gradient-Based Optimization
Mathematics, 2021 A gradient-based optimization (GBO) method is presented for acoustic lens design and sound localization. GBO uses a semi-analytical optimization combined with the principle of acoustic reciprocity.
Feruza Amirkulova +2 more
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A Review of UltraHigh Frequency Ultrasonic Transducers
Frontiers in Materials, 2022 The ultrahigh-frequency (UHF) ultrasonic transducers are active in various fields, including nondestructive evaluation in the semiconductor industry, microscopic biological organization imaging in biomedicine, particle manipulation, and so on.
Jun Chen +8 more
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Numerical study of acoustic focusing using a bianisotropic acoustic lens [PDF]
The Journal of the Acoustical Society of America, 2020 Materials with sub-wavelength asymmetry and long-range order have recently been shown to demonstrate acoustical properties analogous to electromagnetic bianisotropy. One characteristic of bianisotropic acoustic media is the existence of direction-dependent acoustic impedance. Therefore, the magnitude and phase of the acoustic fields transmitted through
A J, Lawrence +3 more
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Analysis of dynamic high-frequency acoustic field control by metasurfaces lens
AIP Advances, 2019 Acoustic metasurfaces have largely been explored for acoustic field modulation, but because of their structural complexity, they are mainly implemented for airborne low frequency sound and generally located in the transmission medium, acting as a ...
Xinyu Yang +7 more
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Ejection Characteristics and Drop Modulation of Acoustic Inkjet Printing Using Fresnel Lens
Journal of Fluid Science and Technology, 2009 Acoustic Inkjet Printing uses an acoustic beam focused on a free liquid surface for drop ejection. This method can eject small drops without precise nozzle fabrication in comparison with thermal inkjet and piezoelectric inkjet.
Toshinobu HAMAZAKI, Naoki MORITA
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2D phononic-crystal Luneburg lens for all-angle underwater sound localization
Acta Acustica, 2022 Phononic crystals are well known for acoustic wave manipulation which may have potential application in an underwater acoustic detection system. In this work, we design and simulate a two-dimensional Luneburg lens based on gradient-index (GRIN) phononic ...
Ruan Yongdu, Liang Xu
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Broadband Characterization of Near-Field Focusing With Groove-Structured Lens
IEEE Access, 2021 Subdiffraction focusing of acoustic waves in the near-field can remarkably improve the signal-to-noise ratio in super-resolution acoustic imaging. Recently, we have successfully demonstrated the feasibility of near-field focusing with groove-structured ...
Ye Han, Jian Chen, Zheng Fan
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Research, 2019 We demonstrate a conformally mapped multifunctional acoustic metamaterial Mikaelian lens. Mikaelian lens is a gradient medium with a hyperbolic secant refractive index profile that can realize functions like beam self-focusing.
He Gao +6 more
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Numerical calculation and measurement for the focus field of concave spherical acoustic lens transducer [PDF]
MATEC Web of Conferences, 2019 How to accurately calculate the sound field formed by acoustic lenses is an important basis for the design of acoustic lens transducers. The radiation sound field distribution of the physical model of acoustics lens is simulated by numerical methods ...
Zhang Jun, Chen Yi, Yang Liuqing
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