Quasi-Bessel Acoustic-Vortex Beams Constructed by the Line-Focused Phase Modulation for a Ring Array of Sectorial Planar Transducers

Liang, Dengliang; Hu, Gaorui; Ding, Ning; Ma, Qingyu; Guo, Gepu; Li, Yuzhi; Tu, Juan; D, Dong Zhang

doi:10.1109/tuffc.2021.3120285

Cited by 10 publications

(2 citation statements)

References 44 publications

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“…For the traditional planar transducer with a weaker directivity, a smaller maximum rotation angle step should be adopted to the MAET system. Whereas, for the specially designed line‐focused acoustic beam 37 with a negligible radiation angle, the maximum rotation angle step can be greatly increased for MAET.…”

Section: Discussionmentioning

confidence: 99%

General principle and optimization of magneto‐acousto‐electrical tomography based on image distortion evaluation

Chen

Guo

et al. 2023

Medical Physics

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Background: As a novel non-invasive multi-physics imaging methodology, the magneto-acousto-electrical (MAE) technology is capable of detecting electric conductivity changes for biological tissues, exhibiting prosperous perspectives in medical applications. However, the acoustic beam was often simplified to a straight line or a focused one, being perpendicular to layered boundaries of tissues in previous studies. Linear-scanning measurements were carried out to reconstruct B-mode MAE images for layered models without considering the radiation pattern of transducers. Obvious image distortions in both shape and brightness were observed in experiments without any reasonable explanation. Purpose: This study aims to establish a general physical model for MAE measurements and solve the problem of B-mode image distortion, and hence provide theoretical and technical supports for the improvement of MAE imaging in practical applications. Methods: By considering the radiation pattern of actual transducers and the inclined angle of electric conductivity boundaries, a general principal of MAE measurements applicable for objects of arbitrary shapes is proposed based on the theories of acoustic radiation, Hall Effect and electrical detection. The influences of inclined conductivity boundaries and transducer directivities are numerically analyzed with Matlab programming and also demonstrated by experimental measurements. To evaluate the degree of B-mode image distortion, the deformation length (3 dB amplitude decrease) of approximate straight lines for a circular model is defined as L = dtan(β m /2), with d and β m being the measurement distance and the half radiation angle of the main-lobe, respectively. The rotary-scanning-based MAE tomography (MAET) is employed to reduce the image distortion, and the rotation angle step is further optimized based on the criterion of the boundary radius fluctuation coefficient <0.01 mm. Results:The experimental results of MAE signals and B-mode images as well as MAETs show good agreements with simulations. It is demonstrated that, as the increase of the inclined angle, the MAE decreases rapidly with an extended time interval and reaches the 20 dB amplitude decrease when the angle exceeds 12 • . Meanwhile, the deformation length of B-mode MAE imaging increases with the increase of the radiation angle for the transducer with a weaker radiation pattern, and hence results in a more serious image distortion. A smaller rotation angle step should be adopted to the MAET system with a longer deformation length, and the optimized maximum angle step of 12 • is also achieved for the omnidirectional radiation of point sources with a long deformation length.

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Section: Discussionmentioning

confidence: 99%

General principle and optimization of magneto‐acousto‐electrical tomography based on image distortion evaluation

Chen

Guo

et al. 2023

Medical Physics

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“…[1][2][3][4][5] Among them, sound focusing is an important function of the metalenses in the form of point focusing or region focusing, such as a non-diffracting Bessel beam. 6) Climente et al conducted an analysis on the focusing performance of an acoustic lens between 3.5 kHz and 4.5 kHz using ray theory and multiple scattering theory. 7) Yu et al achieved acoustic focusing between 700 Hz and 2.7 kHz by manipulating the rotation angle of the scatterer in the acoustic lens to adjust the phase.…”

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confidence: 99%

Novel phononic-crystal-arrayed acoustic metalens for long beam focusing in multi-band

Zhang

Tao

Wang

et al. 2023

Appl. Phys. Express

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We propose a multi-band acoustic metalen that achieves 18-26λ long-range beam focusing and narrow full width at half maximum (FWHM) of 4-5λ across multiple frequency bands, utilizing principles of multiple scattering theory. The metalens sample was meticulously fabricated using quadrilateral lattice scatterers in the cross-section, and its experimental acoustic field tests showed focused sound beams with a length of 0.78 - 1.07 m falling within the frequency bands of 5800 - 6100 Hz, 8500 - 8700 Hz, and 9700 - 9900 Hz. This study holds potential applications in acoustic directional projection, signal enhancement, and acoustic power collection.

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Pressure and phase characteristics of orbital angular momentum multiplexed perfect acoustic-vortexes

Yue,

Chen,

Liu

et al. 2024

Applied Acoustics

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Quasi-Bessel Acoustic-Vortex Beams Constructed by the Line-Focused Phase Modulation for a Ring Array of Sectorial Planar Transducers

Cited by 10 publications

References 44 publications

General principle and optimization of magneto‐acousto‐electrical tomography based on image distortion evaluation

General principle and optimization of magneto‐acousto‐electrical tomography based on image distortion evaluation

Novel phononic-crystal-arrayed acoustic metalens for long beam focusing in multi-band

Pressure and phase characteristics of orbital angular momentum multiplexed perfect acoustic-vortexes

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