Results 21 to 30 of about 15,272 (279)

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, Benjamin M, Goldsberry, Samuel P, Wallen, Michael R, Haberman   +3 more
openaire   +2 more sources

Range-dependent flexibility in the acoustic field of view of echolocating porpoises (Phocoena phocoena) [PDF]

, 2015
Funding: Det Frie Forskningsrad (MJ)Toothed whales use sonar to detect, locate, and track prey. They adjust emitted sound intensity, auditory sensitivity and click rate to target range, and terminate prey pursuits with high-repetition-rate, low-intensity
Christensen, C.B., Johnson, Mark, John M Ratcliffe, Johnson, M., Koblitz, Jens C., Koblitz, J., Madsen, Peter Teglberg, Wisniewska, D., Beedholm, Kristian, Jens C Koblitz, Ratcliffe, J., Wahlberg, M., Koblitz, Jens C, Madsen, P.T., Ratcliffe, John M., Madsen, P., Madsen, Peter T., Koblitz, J. C., Wisniewska, Danuta Maria, Wisniewska, Danuta M., Wahlberg, Magnus, Danuta M Wisniewska, Madsen, Peter M., Christensen, C. B., Christensen, Christian Bech, Beedholm, K., Ratcliffe, J.M., Magnus Wahlberg, Wisniewska, D.M., Kristian Beedholm, Wahlberg, Magnus; id_orcid, Christensen, Christian B., Christian B Christensen, Koblitz, J.C., Wisniewska, D. M.; id_orcid, Ratcliffe, John Morgan, Mark Johnson, Christensen, C., Peter T Madsen   +38 more
core   +1 more source

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, Chunlong Fei, Di Li, Zhaoxi Li, Xinhao Sun, Shang Hou, Wei Feng, Yintang Yang   +7 more
doaj   +1 more source

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
doaj   +1 more source

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
doaj   +1 more source

3D Localization of Scatterers with a Spiral-Shaped Acoustic Lens

, 2022
Traditionally, single element transducers are used for localizing objects in 1D through A-mode scans, where only the echo envelope is used. Due to the transducer surface symmetry, A-mode scans performed for azimuthally or elevationally translated ...
Nie, L., Tang, M-X., Harput, S., Freear, S., Toulemonde, M.   +4 more
core   +2 more sources

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
doaj   +1 more source

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
doaj   +1 more source

The radar signature of the Wind Lens: a less disruptive wind turbine? [PDF]

, 2012
We study the radar signature of a new type of wind turbine, named the Wind Lens. This design includes a flanged shroud around the turbine which concentrates the wind flow past the turbine blades and hence improves the efficiency.
H. Griffiths, Griffiths, Hugh D., T. Matsuura, A. Balleri, A. Al-Armaghany, Al-Armaghany, A., Tong, Kenneth, K. Tong, Balleri, Alessio, Matsuura, Takashi   +9 more
core   +1 more source

Conformally Mapped Multifunctional Acoustic Metamaterial Lens for Spectral Sound Guiding and Talbot Effect

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, Xinsheng Fang, Zhongming Gu, Tuo Liu, Shanjun Liang, Yong Li, Jie Zhu   +6 more
doaj   +1 more source