abstract：:This paper describes an optimization method of the top electrode size for a thin film matrix ultrasonic transducer (M-UT) in the frequency range above 200 MHz. The goal of this work is to design an optimal top electrode size for an M-UT providing the maximal output peak-peak voltage (V(PP)) and the maximal signal-to-n...

journal_title：Ultrasonics

authors： Wei Y,Herzog T,Heuer H

更新日期：2013-03-01 00:00:00

abstract：:The paper deals with the study of the resonances of 1D periodic media composed of N elementary cells formed with two perfectly bonded layers which exhibit a high acoustic impedance contrast. In the case of a periodic bilayer structure constituted of a fluid layer and an elastic plate, it was shown in previous theoreti...

journal_title：Ultrasonics

authors： Khaled A,Maréchal P,Lenoir O,Ech-Cherif El-Kettani M,Chenouni D

更新日期：2013-03-01 00:00:00

abstract：:This paper deals with the analysis of the guided evanescent waves in stopbands of a 1D phononic crystal (PC). A new numerical implementation is shown in order to get the complex values of the wavenumbers in a frequency range where a gap occurs. The considered phononic system is an aluminum plate with a one-dimensional...

journal_title：Ultrasonics

authors： Bavencoffe M,Morvan B,Hladky-Hennion AC,Izbicki JL

更新日期：2013-02-01 00:00:00

abstract：:Broken wires often occur at multiple locations in the same wire of a strand due to the recovery length, which is defined as the length of the wire taking up its full share of the axial load from the break point. The detection of broken-wire flaws at multiple locations along the same wire is investigated using guided w...

journal_title：Ultrasonics

authors： Xu J,Wu X,Sun P

更新日期：2013-01-01 00:00:00

abstract：:Images captured during routine clinical transcranial sonography (TCS) examination are of a low resolution, so can be confusing for diagnostic evaluations. Manual segmentation of brain structures (areas of the midbrain and substantia nigra (SN)) that are of special interest cause inter-observer and intra-observer varia...

journal_title：Ultrasonics

authors： Sakalauskas A,Lukoševičius A,Laučkaitė K,Jegelevičius D,Rutkauskas S

更新日期：2013-01-01 00:00:00

abstract：:In this study, we found that microbubbles with diameters of less than 100μm can be easily generated by using a hollow cylindrical ultrasonic horn. Consecutive images of bubbles obtained by using high-speed and high-resolution cameras reveal that a capillary wave is formed on the gas-liquid interface under weak ultraso...

journal_title：Ultrasonics

authors： Makuta T,Suzuki R,Nakao T

更新日期：2013-01-01 00:00:00

abstract：:A reformulation of the Thomson-Haskell method is presented for calculating the reflection coefficients of multilayer structure immersing in the coupling fluid. Instead of directly multiplying the layer propagator matrix, the new method splits the layer propagator matrix and excursively determines the interface stiffne...

journal_title：Ultrasonics

authors： Chen J,Bai X,Yang K,Ju BF

更新日期：2012-12-01 00:00:00

abstract：:A surface ultrasonic wave approach was presented for measuring surface stress of brush electro-plating nickel coating specimen, and the influence of coating thickness on surface stress measurement was discussed. In this research, two Rayleigh wave transducers with 5MHz frequency were employed to collect Rayleigh wave ...

journal_title：Ultrasonics

authors： Liu B,Dong S,Xu B,He P

更新日期：2012-09-01 00:00:00

abstract：:Targeted mechanical cell stimulation has been extensively studied for a better understanding of its effect on cellular mechanotransduction signaling pathways and structures by utilizing a variety of mechanical sources. In this work, an ultrasound-driven single cell stimulation method is thus proposed, and a preliminar...

journal_title：Ultrasonics

authors： Hwang JY,Lee J,Lee C,Jakob A,Lemor R,Medina-Kauwe LK,Shung KK

更新日期：2012-09-01 00:00:00

abstract：:The conventional acoustic nonlinear technique to evaluate the contact acoustic nonlinearity (CAN) at solid-solid contact interfaces (e.g., closed cracks), which uses the through-transmission of normally incident bulk waves, is limited in that access to both the inner and outer surfaces of structures for attaching puls...

journal_title：Ultrasonics

authors： Nam T,Lee T,Kim C,Jhang KY,Kim N

更新日期：2012-08-01 00:00:00

abstract：:In this paper, the resonance frequency equation and expression of displacement amplitude magnifications of a full-wave barber ultrasonic horn are obtained. By discussing the relationships between the displacement amplitude magnifications and the geometrical dimensions, the optimized design of the horn for the largest ...

journal_title：Ultrasonics

authors： Fu Z,Xian X,Lin S,Wang C,Hu W,Li G

更新日期：2012-07-01 00:00:00

abstract：:The acousto-optic interaction with leaky surface acoustic wave radiation into the bulk of YX-cut LiTaO(3) crystals has been investigated. The light incidence and diffraction angles corresponding to the strongest acousto-optic interaction were calculated and measured as functions of the acoustic wave frequency. The dep...

journal_title：Ultrasonics

authors： Belovickis J,Rimeika R,Ciplys D

更新日期：2012-07-01 00:00:00

abstract：:Silver epoxy was selected to bond transducer plates on glass substrates. The properties and thickness of the bonding medium affect the electrical input impedance of the transducer. Thus, the thickness of the silver epoxy bonding layer was used as a design parameter to optimize the structure for the transducer input im...

journal_title：Ultrasonics

authors： Son KT,Lee CC

更新日期：2012-04-01 00:00:00

abstract：:Many sparse signal representation (SSR) algorithms have been developed in the past decade. The advantages of SSR such as compact representations and super resolution lead to the state of the art performance of SSR for processing ultrasonic non-destructive evaluation (NDE) signals. Choosing a suitable SSR algorithm and...

journal_title：Ultrasonics

authors： Zhang GM,Zhang CZ,Harvey DM

更新日期：2012-03-01 00:00:00

abstract：:In a recent report [F.G. Mitri, Z.E.A. Fellah, Ultrasonics 51 (2011) 719-724], it has been found that the instantaneous axial force (i.e. acting along the axis of wave propagation) of a Bessel acoustic beam centered on a sphere is only determined for the fundamental order (i.e. m=0) but vanishes when the beam is of vo...

journal_title：Ultrasonics

authors： Mitri FG,Fellah ZE

更新日期：2012-01-01 00:00:00

abstract：:The dispersion behavior of waves in multiferroic plates with imperfect interfacial bonding has been investigated via the method of reverberation-ray matrix, which is directly established from the three-dimensional equations of magneto-electro-elasticity in the form of state space formalism. A generalized spring-layer ...

journal_title：Ultrasonics

authors： Zhu J,Chen W,Ye G

更新日期：2012-01-01 00:00:00

abstract：:This paper presents a system that accurately measures the distance travelled by ultrasound waves through the air. The simple design of the system and its obtained accuracy provide a tool for non-contact distance measurements required in the laser's optical system that investigates the surface of the eyeball. ...

journal_title：Ultrasonics

authors： Licznerski TJ,Jaroński J,Kosz D

更新日期：2011-12-01 00:00:00

abstract：:The wave propagation of an infinite functionally graded plate in thermal environments is studied using the higher-order shear deformation plate theory. The thermal effects and temperature-dependent material properties are both taken into account. The temperature field considered is assumed to be a uniform distribution...

journal_title：Ultrasonics

authors： Sun D,Luo SN

更新日期：2011-12-01 00:00:00

abstract：:Traditional rotary corers and sample retrieval mechanisms for planetary drilling suffer from a variety of technical difficulties. A heavy and rigid drillstring must be assembled on-site and deployed with considerable applied preload and torque, and these mechanical loadings are difficult to react in a low gravity envi...

journal_title：Ultrasonics

authors： Harkness P,Lucas M,Cardoni A

更新日期：2011-12-01 00:00:00

abstract：:The design and simulation of power transducers are difficult since piezoelectric, dielectric and elastic properties of ferroelectric materials differ from linear behavior when driven at large levels. This paper is devoted to modeling of a resonant power transducer at a high level of dynamic mechanical stress. The powe...

journal_title：Ultrasonics

authors： Guyomar D,Ducharne B,Sebald G

更新日期：2011-12-01 00:00:00

abstract：:Effective receive beamforming in medical ultrasound imaging is important for enhancing spatial and contrast resolution. In current ultrasound receive beamforming, a constant sound speed (e.g., 1540m/s) is assumed. However, the variations of sound speed in soft tissues could introduce phase distortions, leading to degr...

journal_title：Ultrasonics

authors： Yoon C,Lee Y,Chang JH,Song TK,Yoo Y

更新日期：2011-10-01 00:00:00

abstract：:A cylindrical standing wave ultrasonic motor using bending vibration transducer was proposed in this paper. The proposed stator contains a cylinder and a bending vibration transducer. The two combining sites between the cylinder and the transducer locate at the adjacent wave loops of bending vibration of the transduce...

journal_title：Ultrasonics

authors： Liu Y,Chen W,Liu J,Shi S

更新日期：2011-07-01 00:00:00

abstract：:The paper presents an equivalent circuit model of the polymer coated surface acoustic wave (SAW) resonators by combining coupling-of-mode (COM) description of SAW resonators and perturbation calculation of SAW propagation under polymer loading. An expression for the motional load produced by polymer coating is deduced...

journal_title：Ultrasonics

authors： Kshetrimayum R,Yadava RD,Tandon RP

更新日期：2011-07-01 00:00:00

abstract：BACKGROUND:Ultrasound tissue harmonic signal generally provides superior image quality as compared to the linear signal. However, since the generation of the tissue harmonic signal is based on finite amplitude distortion of the propagating waveform, the penetration and the sensitivity in tissue harmonic imaging are mar...

journal_title：Ultrasonics

authors： Shen CC,Shi TY

更新日期：2011-07-01 00:00:00

abstract：BACKGROUND AND MOTIVATION:Previous works investigating the radiation force of diverging spherical progressive waves incident upon spherical particles have demonstrated the direction of reversal of the force when the particle is subjected to a curved wave-front. In this communication, the analysis is extended to the cas...

journal_title：Ultrasonics

authors： Mitri FG,Fellah ZE

更新日期：2011-07-01 00:00:00

abstract：:Guided waves propagating in cylindrical tubes are frequently applied for the characterization of material or geometrical properties of tubes. In a tube, guided waves can propagate in the axial direction and called axial guided waves, or in the circumferential direction called circumferential guided waves. Dispersion s...

journal_title：Ultrasonics

authors： Yeh CH,Yang CH

更新日期：2011-05-01 00:00:00

abstract：:The radial variations in the velocity of longitudinal waves propagating through Japanese cedar and Japanese cypress were experimentally investigated. In addition, the tracheid length (TL), microfibril angle (MFA), air-dried density (AD), and moisture content (MC) were measured in order to determine the effect of wood ...

journal_title：Ultrasonics

authors： Hasegawa M,Takata M,Matsumura J,Oda K

更新日期：2011-04-01 00:00:00

abstract：:Experimental studies of thermal effects in high-intensity focused ultrasound (HIFU) procedures are often performed with the aid of fine wire thermocouples positioned within tissue phantoms. Thermocouple measurements are subject to several types of error which must be accounted for before reliable inferences can be mad...

journal_title：Ultrasonics

authors： Dasgupta S,Banerjee RK,Hariharan P,Myers MR

更新日期：2011-02-01 00:00:00

abstract：:We study thickness-shear vibration of a quartz plate connected to two piezoelectric ceramic plates with initial deformations caused by a biasing electric field. The theory for small deformations superposed on finite biasing deformations in an electroelastic body is used. It is shown that the resonant frequencies of th...

journal_title：Ultrasonics

authors： Zhou Y,Chen W,Yang J,Du J

更新日期：2011-02-01 00:00:00

abstract：:This paper establishes a model evaluating the signal loss of double transmitted acoustic beams through random rough liquid-solid surfaces based on Fresnel approximation and the phase-screen approximation. The numerical solution is replaced with a simple analytical solution through using the exponential substitution ap...

journal_title：Ultrasonics

authors： Chen Z,Yang L

更新日期：2011-01-01 00:00:00

abstract：:The focus of contrast-enhanced ultrasound research has developed beyond visualizing the blood pool and its flow to new areas such as perfusion imaging, drug and gene therapy, and targeted imaging. In this work comparison between the application of polymer- and phospholipid-shelled ultrasound contrast agents (UCAs) for...

journal_title：Ultrasonics

authors： Grishenkov D,Kari L,Brodin LK,Brismar TB,Paradossi G

更新日期：2011-01-01 00:00:00

abstract：:This paper describes fabrication and comparison of PMN-PT single crystal, PZT, and PZT-based 1-3 composite ultrasonic transducers for NDE applications. As a front matching layer between test material (Austenite stainless steel, SUS316) and piezoelectric materials, alumina ceramics was selected. The appropriate acousti...

journal_title：Ultrasonics

authors： Kim KB,Hsu DK,Ahn B,Kim YG,Barnard DJ

更新日期：2010-08-01 00:00:00

abstract：:Arterial stiffness has been shown to be a good indicator of arterial wall disease. However, a single parameter is insufficient to describe the complex stress-strain relationship of a multi-component, non-linear tissue such as the aorta. We therefore propose a new approach to measure the stress-strain relationship loca...

journal_title：Ultrasonics

authors： Danpinid A,Luo J,Vappou J,Terdtoon P,Konofagou EE

更新日期：2010-06-01 00:00:00

abstract：:This paper deals with the influence of gas law on ultrasonic behaviour of porous media when the saturating fluid is high pressured. Previous works have demonstrated that ultrasonic transmission through a porous sample with variations of the static pressure (up to 18 bars) of the saturating fluid allows the characteriz...

journal_title：Ultrasonics

authors： Griffiths S,Ayrault C

更新日期：2010-06-01 00:00:00

abstract：:In spite of many advances in analytical and numerical modeling techniques for solving different engineering problems, an efficient solution technique for wave propagation modeling of an electromagnetic acoustic transducer (EMAT) system is still missing. Distributed point source method (DPSM) is a newly developed semi-...

journal_title：Ultrasonics

authors： Eskandarzade M,Kundu T,Liebeaux N,Placko D,Mobadersani F

更新日期：2010-05-01 00:00:00

abstract：:Temperature control of hyperthermia treatments is generally implemented with multipoint feedback system comprised of phased-array transducer, which is complicated and high cost. Our simulations to the acoustic field induced by a self-focused concave spherical transducer (0.5MHz, 9cm aperture width, 8.0cm focal length)...

journal_title：Ultrasonics

authors： Hu J,Qian S,Ding Y

更新日期：2010-05-01 00:00:00

abstract：BACKGROUND AND OBJECTIVE:Acoustic scattering properties of ultrasound contrast agents are useful in extending existing or developing new techniques for biomedical imaging applications. A useful first step in this direction is to investigate the acoustic scattering of a new class of acoustic beams, known as helicoidal h...

journal_title：Ultrasonics

authors： Mitri FG

更新日期：2010-03-01 00:00:00

abstract：:In this study, we present a model study of guided wave dispersion and resonance behavior of an array of piezoelectric plates with arbitrary cross-sections. The objective of this work is to analyze the influence of the geometry of an element of a 1D-array ultrasound transducer on generating multi-resonance frequency so...

journal_title：Ultrasonics

authors： Cortes DH,Datta SK,Mukdadi OM

更新日期：2010-03-01 00:00:00

abstract：:A circular cylindrical piezoelectric transducer with radial polarization is proposed. The axial vibration characteristics of the transducer are studied by three different methods: analytical calculation, FEM simulation and experiment. The symmetric and asymmetric excitation conditions are discussed in the Haskins and ...

journal_title：Ultrasonics

authors： Sun D,Wang S,Hata S,Shimokohbe A

更新日期：2010-03-01 00:00:00

abstract：:Recent achievements of nonlinear acoustics concerning the realization of solitons and solitary waves in crystals and their surfaces attained by nanosecond and picosecond laser ultrasonics are discussed and compared. The corresponding pump-probe setups are described, which allow an all-optical contact-free excitation a...

journal_title：Ultrasonics

authors： Hess P,Lomonosov AM

更新日期：2010-02-01 00:00:00