A Thin Transducer With Integrated Acoustic Metamaterial for Cardiac CT Imaging and Gating

Rojas, Stephan Strassle; Tridandapani, Srini; Lindsey, Brooks D.

doi:10.1109/tuffc.2021.3140034

Cited by 3 publications

(2 citation statements)

References 42 publications

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“…Increasing the directional energy from the transmitter to a geological structure is an effective way to address this limitation. Currently, acoustic transducers based on the piezoelectric effect are used in various fields [ 5 , 6 , 7 ]. Three sources are primarily used in the acoustic transmitter: monopole, dipole, and phased-array sources.…”

Section: Introductionmentioning

confidence: 99%

A Plasma Transmitting Source for Borehole Acoustic Reflection Imaging

Hao

Zhou

Shang

et al. 2022

Sensors

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The detection depth of current borehole acoustic reflection imaging is only tens of meters without high resolution. This considerably limits its wide application in the identification and fine description of unconventional reservoirs and in the optimization of drilling trajectories. Increasing the directional energy from the transmitter to a geological structure is an excellent way to solve this issue. In this study, a plasma source with a parabolic reflector was introduced during borehole acoustic reflection imaging. First, an experimental system was built for testing the plasma source. Next, the acoustic-electrical characteristics and directional radiation of the source were studied using experiments and a numerical simulation. Finally, the advantages, disadvantages, and feasibility of the plasma-transmitting source were analyzed; some suggestions for further work on the source and its logging application were proposed. The experimental and simulation results show that the use of a plasma source with a parabolic reflector can increase the detection depth of borehole acoustic reflection imaging to hundreds of meters with high resolution. This is crucial in imaging the geological structures near boreholes and enhancing oil–gas exploration and development.

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Section: Introductionmentioning

confidence: 99%

A Plasma Transmitting Source for Borehole Acoustic Reflection Imaging

Hao

Zhou

Shang

et al. 2022

Sensors

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“…4 In general, two common concepts underpinning AMs are Bragg scattering and local resonances. 5,6 Subsequently, the advances in AMs offer new routing in realizing wave manipulation, 7 acoustical filter, 8 acoustic imaging, 9 energy harvesting, 10 subwavelength waveguide, 11 and seismic protection, 12 among others.…”

Section: Introductionmentioning

confidence: 99%

Robust large-area elastic transverse wave transport in active acoustic metamaterials

Chen

Wang

Lim

et al. 2022

Journal of Applied Physics

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We investigate robust large-area elastic transverse wave propagation in an actively tunable membrane-type acoustic metamaterial. The waveguide with multiple degrees of freedom to control the width of the interface mode is realized by designing a heterostructure including three domains. One central domain is constructed by periodic unit cells in an ordinary state, where a Dirac cone can be observed in the band structure. The other two domains consist of periodic unit cells possessing opposite valley Chern numbers, respectively. By employing a finite element model, the topologically protected interface states with tunable degrees of freedom are exhibited. The energy of interface states distributes equally in the large-central region. Although a larger degree of freedom leads to lower amplitudes of interface states, larger total energy is demonstrated by defining a quality factor. Moreover, we design several waveguides with straight lines and sharp corners with different angles and denote three different notations to show clearly that the large-area transverse wave can propagate robustly through sharp corners. Finally, it is found that the large-area transverse wave transport shows immunity to disorders and defects in the propagation path.

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Far-Field Acoustic Imaging Enhancement Using Compact Graded Refractive Index Metamaterials

Li,

Ma,

et al. 2023

IEEE Trans. Comput. Imaging

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A Thin Transducer With Integrated Acoustic Metamaterial for Cardiac CT Imaging and Gating

Cited by 3 publications

References 42 publications

A Plasma Transmitting Source for Borehole Acoustic Reflection Imaging

A Plasma Transmitting Source for Borehole Acoustic Reflection Imaging

Robust large-area elastic transverse wave transport in active acoustic metamaterials

Far-Field Acoustic Imaging Enhancement Using Compact Graded Refractive Index Metamaterials

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