Application of a Resonant Metamaterial Line Array in Ultrasound Compressive Imaging

2018 ◽  
Author(s):  
Ashkan Ghanbarzadeh-Dagheyan ◽  
Ali Molaei ◽  
Juan Heredia-Juesas ◽  
Jose Angel Martinez-Lorenzo
Keyword(s):  
Compressive Sensing ◽  
Impedance Matching ◽  
Acoustic Metamaterials ◽  
Compressive Imaging ◽  
Beam Focusing ◽  
Line Array ◽  
Spread Function ◽  
Unit Cells ◽  
Imaging Performance ◽  
Theoretical Results

Acoustic metamaterials have been proposed for numerous applications including subwavelength imaging, impedance matching, and lensing. Yet, their application in compressive sensing and imaging has not been fully investigated. When metamaterials are used as resonators at certain frequencies, they can generate random radiation patterns in the transmitted and received waves to and from a target. Compressive sensing favors such randomness inasmuch as it can increase incoherence by decreasing the amount of mutual information between any two different measurements. This study aims at assessing whether the use of resonating metamaterial unit cells in a single-layered array between a number of ultrasound transceivers and targets can improve the sensing capacity, point-spread function of the sensing array (their beam focusing ability), and imaging performance in pointlike target detection. The theoretical results are promising and can open the way for more efficient metamaterial designs with the aim of enhancing ultrasound imaging with lower number of transceivers compared to the regular systems.

A Resonant Metamaterial Line Array for Ultrasound Compressive Imaging

2020 ◽  
Vol 142 (2) ◽  
Author(s):  
Ashkan Ghanbarzadeh-Dagheyan ◽  
Ali Molaei ◽  
Juan Heredia-Juesas ◽  
Jose Angel Martinez-Lorenzo
Keyword(s):  
Compressive Sensing ◽  
Impedance Matching ◽  
Acoustic Metamaterials ◽  
Compressive Imaging ◽  
Beam Focusing ◽  
Transmitted Waves ◽  
Line Array ◽  
Spread Function ◽  
Unit Cells ◽  
Imaging Performance

Abstract Acoustic metamaterials have been proposed for numerous applications including subwavelength imaging, impedance matching, and lensing. Yet, their application in compressive sensing and imaging has not been fully investigated. When metamaterials are used as resonators at certain frequencies, they can generate random radiation patterns in the transmitted waves from the transducers and received waves from a target. Compressive sensing favors such randomness inasmuch as it can increase incoherence by decreasing the amount of mutual information between any two different measurements. This study aims at assessing whether the use of resonating metamaterial unit cells in a single-layered non-optimized array between a number of ultrasound transceivers and targets can improve the sensing capacity, point-spread function of the sensing array (their beam focusing ability), and imaging performance in point-like target detection. The theoretical results are promising and can open the way for more efficient metamaterial designs with the aim of enhancing ultrasound imaging with lower number of transceivers compared to the regular systems.

A multi-octave microwave 6-bit true time delay with low amplitude and delay variation in 65 nm CMOS

2021 ◽  
pp. 1-10
Author(s):  
Yakov Gutkin ◽  
Asher Madjar ◽  
Emanuel Cohen
Keyword(s):  
Time Delay ◽  
Insertion Loss ◽  
Impedance Matching ◽  
Least Significant Bit ◽  
Delay Cell ◽  
True Time Delay ◽  
Unit Cells ◽  
True Time ◽  
And Performance ◽  
Low Amplitude

Abstract In this paper, we describe the design, layout, and performance of a 6-bit TTD (true time delay) chip operating over the entire band of 2–18 GHz. The 1.15 mm2 chip is implemented using TSMC foundry 65 nm technology. The least significant bit is 1 ps. The design is based on the concept of all-pass network with some modifications intended to reduce the number of unit cells. Thus, the first three bits are implemented in a single delay cell. A peaking buffer amplifier between bit 4 and bit 5 is used for impedance matching and partial compensation of the insertion loss slope. The rms delay error of the TTD is <1 ps over most of the frequency band and insertion loss is between 2.5 and 6.3 dB for all 64 states.

Tapered labyrinthine acoustic metamaterials for broadband impedance matching

2013 ◽  
Vol 103 (20) ◽  
pp. 201906 ◽  
Author(s):  
Yangbo Xie ◽  
Adam Konneker ◽  
Bogdan-Ioan Popa ◽  
Steven A. Cummer
Keyword(s):  
Impedance Matching ◽  
Acoustic Metamaterials

Tunable acoustic waveguide based on vibro-acoustic metamaterials with shunted piezoelectric unit cells

2015 ◽  
Vol 24 (10) ◽  
pp. 105018 ◽  
Author(s):  
Byung-Jin Kwon ◽  
Jin-Young Jung ◽  
Dooho Lee ◽  
Kwang-Chun Park ◽  
Il-Kwon Oh
Keyword(s):  
Acoustic Metamaterials ◽  
Acoustic Waveguide ◽  
Unit Cells

scholarly journals Evaluation of uncertainty effects to band gap behavior of circuitry-integrated piezoelectric metamaterial using order-reduced analysis

2018 ◽  
Vol 29 (12) ◽  
pp. 2677-2692 ◽  
Author(s):  
Wangbai Pan ◽  
Guoan Tang ◽  
Jiong Tang
Keyword(s):  
Band Gap ◽  
Parameter Uncertainty ◽  
Good Accuracy ◽  
Integrated System ◽  
Acoustic Metamaterials ◽  
Type Analysis ◽  
Design And Synthesis ◽  
Unit Cells ◽  
Geometry Configuration ◽  
Reduced Modeling

Acoustic metamaterials with unit cells that are integrated with piezoelectric transducer circuitry exhibit interesting band gap behaviors that can be used for wave/vibration manipulation. This research reports the evaluation of uncertainty effects to a typical piezoelectric metamaterial, where uncertainties in geometry/configuration and in circuitry elements are taken into consideration. Monte Carlo–type analysis is performed to assess the band gap features under these uncertainties. In order to facilitate tractable computation in uncertainty analysis, order-reduced modeling of the electro-mechanically integrated system is formulated. The component mode synthesis–based order-reduced modeling increases the computational efficiency significantly while maintaining good accuracy. Results show that the band gap behavior is generally less sensitive to configuration uncertainty but can be greatly affected by circuitry parameter uncertainty. These results can be used to guide the design and synthesis of piezoelectric metamaterials, and the method developed can be applied to the uncertainty quantification of other types of metamaterials.

scholarly journals Theoretical and experimental investigation of a 1:3 internal resonance in a beam with piezoelectric patches

2020 ◽  
Vol 26 (13-14) ◽  
pp. 1119-1132 ◽  
Author(s):  
Vinciane Guillot ◽  
Arthur Givois ◽  
Mathieu Colin ◽  
Olivier Thomas ◽  
Alireza Ture Savadkoohi ◽  
...  
Keyword(s):  
Harmonic Balance ◽  
Internal Resonance ◽  
Harmonic Balance Method ◽  
Mode Shapes ◽  
Governing Equations ◽  
Internal Resonances ◽  
Thin Beam ◽  
Beam Focusing ◽  
Theoretical Results ◽  
Theoretical Developments

Experimental and theoretical results on the nonlinear dynamics of a homogeneous thin beam equipped with piezoelectric patches, presenting internal resonances, are provided. Two configurations are considered: a unimorph configuration composed of a beam with a single piezoelectric patch and a bimorph configuration with two collocated piezoelectric patches symmetrically glued on the two faces of the beam. The natural frequencies and mode shapes are measured and compared with those obtained by theoretical developments. Ratios of frequencies highlight the realization of 1:2 and 1:3 internal resonances, for both configurations, depending on the position of the piezoelectric patches on the length of the beam. Focusing on the 1:3 internal resonance, the governing equations are solved via a numerical harmonic balance method to find the periodic solutions of the system under harmonic forcing. A homodyne detection method is used experimentally to extract the harmonics of the measured vibration signals, on both configurations, and exchanges of energy between the modes in the 1:3 internal resonance are observed. A qualitative agreement is obtained with the model.

A geometrically adjustable 16-channel transmit/receive transmission line array for improved RF efficiency and parallel imaging performance at 7 Tesla

2008 ◽  
Vol 59 (3) ◽  
pp. 590-597 ◽  
Author(s):  
Gregor Adriany ◽  
Pierre-Francois Van de Moortele ◽  
Johannes Ritter ◽  
Steen Moeller ◽  
Edward J. Auerbach ◽  
...  
Keyword(s):  
Transmission Line ◽  
Parallel Imaging ◽  
7 Tesla ◽  
Line Array ◽  
Imaging Performance

scholarly journals Two-Dimensional Composite Acoustic Metamaterials of Rectangular Unit Cell from Pentamode to Band Gap

Crystals ◽  
2021 ◽  
Vol 11 (12) ◽  
pp. 1457
Author(s):  
Qi Li ◽  
Ke Wu ◽  
Mingquan Zhang
Keyword(s):  
Wave Propagation ◽  
Acoustic Wave ◽  
Band Gap ◽  
Unit Cell ◽  
The Other ◽  
Two Dimensional ◽  
Acoustic Metamaterials ◽  
Acoustic Wave Propagation ◽  
Theoretical Support ◽  
Unit Cells

Pentamode metamaterials have been receiving an increasing amount of interest due to their water-like properties. In this paper, a two-dimensional composite pentamode metamaterial of rectangular unit cell is proposed. The unit cells can be classified into two groups, one with uniform arms and the other with non-uniform arms. Phononic band structures of the unit cells were calculated to derive their properties. The unit cells can be pentamode metamaterials that permit acoustic wave travelling or have a total band gap that impedes acoustic wave propagation by varying the structures. The influences of geometric parameters and materials of the composed elements on the effective velocities and anisotropy were analyzed. The metamaterials can be used for acoustic wave control under water. Simulations of materials with different unit cells were conducted to verify the calculated properties of the unit cells. The research provides theoretical support for applications of the pentamode metamaterials.

scholarly journals Compressive Sensing Imaging Based on Modulation of Atmospheric Scattering Medium

2020 ◽  
Vol 10 (13) ◽  
pp. 4466
Author(s):  
Xuelin Lei ◽  
Xiaoshan Ma ◽  
Zhen Yang ◽  
Xiaodong Peng ◽  
Yun Li ◽  
...  
Keyword(s):  
Compressive Sensing ◽  
Digital Micromirror Device ◽  
Scattering Media ◽  
Long Distance ◽  
Ongoing Research ◽  
Compressive Imaging ◽  
Atmospheric Scattering ◽  
The Monte Carlo Method ◽  
Imaging Approach ◽  
Single Pixel

Long-distance imaging in time-varying scattering media, such as atmosphere, is a significant challenge. Light is often heavily diffused while propagating through scattering media, because of which the clear imaging of objects concealed by media becomes difficult. In this study, instead of suppressing diffusion by multiple scattering, we used natural randomness of wave propagation through atmospheric scattering media as an optimal and instantaneous compressive imaging mechanism. A mathematical model of compressive imaging based on the modulation of atmospheric scattering media was established. By using the Monte Carlo method, the atmospheric modulation matrix was obtained, and the numerical simulation of modulation imaging of atmospheric scattering media was performed. Comparative experiments show that the atmospheric matrix can achieve the same modulation effect as the Hadamard and Gaussian random matrices. The effectiveness of the proposed optical imaging approach was demonstrated experimentally by loading the atmospheric measurement matrix onto a digital micromirror device to perform single pixel compressive sensing measurements. Our work provides a new direction to ongoing research in the field of imaging through scattering media.

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