Rare earth ultrasonic transducer technique research.

abstract：:Signal modeling has been proven to be an useful tool to characterize damaged materials under ultrasonic nondestructive evaluation (NDE). In this paper, we introduce a novel digital signal model for ultrasonic NDE of multilayered materials. This model borrows concepts from lattice filter theory, and bridges them to the...

journal_title：Ultrasonics

authors： Bochud N,Gomez AM,Rus G,Peinado AM

更新日期：2015-09-01 00:00:00

abstract：:The present study focuses on a possibility for improving NO removal efficiency from flue gas by application of powerful sound waves. The sound waves (frequency 6.9-17.2kHz, intensity 144-160dB) are propagated from Hartmann sound generators to a preheated graphite disk inside a vertical reaction tube (height 1.8m, I.D....

journal_title：Ultrasonics

authors： Komarov SV,Nemeth S,Hirasawa M

更新日期：2005-02-01 00:00:00

abstract：:Ultrasonic techniques have been used to measure the elastic properties of bone. Eight human tibiae were used to determine and map the elastic properties of cortical and cancellous bone. The present study shows cortical bone to be at least orthotropic in its material symmetry. The mechanical properties of cortical bone...

journal_title：Ultrasonics

authors： Rho JY

更新日期：1996-12-01 00:00:00

abstract：:The method of wave function expansion is adopted to study the three dimensional scattering of a time-harmonic plane progressive sound field obliquely incident upon a multi-layered hollow cylinder with interlaminar bonding imperfection. For the generality of solution, each layer is assumed to be cylindrically orthotrop...

journal_title：Ultrasonics

authors： Rajabi M,Hasheminejad SM

更新日期：2009-12-01 00:00:00

abstract：:Elastography is an imaging technique based on strain estimation in soft tissues under quasi-static compression. The stress is usually created by a compression plate, and the target is imaged by an ultrasonic linear array. This configuration is used for breast elastography, and has been investigated both theoretically ...

journal_title：Ultrasonics

authors： Souchon R,Soualmi L,Bertrand M,Chapelon JY,Kallel F,Ophir J

更新日期：2002-05-01 00:00:00

abstract：:Ultrasonic reflection and transmission measurements on saturated, plane-parallel, poroelastic slabs are presented. A data processing technique is proposed to obtain poroelastic parameters from transmission measurements. A special experimental data acquisition and processing technique is applied to minimize the finite ...

journal_title：Ultrasonics

authors： Jocker J,Smeulders D

更新日期：2009-03-01 00:00:00

abstract：:A noble method for continuous leakage source location with one sensor in gas-filled pipe and noisy environment is proposed based on wavelet analysis and modal location theory. The leakage signals were analyzed into high and low frequencies by wavelet decomposition and noises and reflected waves were omitted. Then the ...

journal_title：Ultrasonics

authors： Mostafapour A,Davoodi S

更新日期：2015-09-01 00:00:00

abstract：:A laser-based technique for the contact-free generation and detection of strongly nonlinear surface acoustic wave (SAW) pulses with amplitudes limited by the materials strength has been developed. The effects of nonlinear propagation of short elastic surface pulses with finite strength in isotropic solids, such as fus...

journal_title：Ultrasonics

authors： Lomonosov AM,Hess P

更新日期：2008-11-01 00:00:00

abstract：:In this paper a high intensity focused ultrasound (FUS) phantom model was developed, in order to be used in experiments for Blood Brain Barrier (BBB) disruption. The target was to create a phantom model that represents the disruption of the BBB during ultrasound application. An appropriate experimental setup was creat...

journal_title：Ultrasonics

authors： Alekou T,Giannakou M,Damianou C

更新日期：2021-02-01 00:00:00

abstract：:The numerical studies conducted in this paper are based on our previous research (Chen et al., 2017); through use of the spectral element method, parametric sensitivity studies of Nonlinear Coda Wave Interferometry (NCWI) are established here and divided into two parts. In the first part, CWI observables are found to ...

journal_title：Ultrasonics

authors： Chen G,Pageot D,Abraham O,Zhang Y,Chekroun M,Tournat V

更新日期：2019-11-01 00:00:00

abstract：:We report on the 3-D modelling of periodic arrays of capacitive micromachined ultrasonic transducers (cMUTs) operating in fluid. Specific developments have been performed to model biperiodic transducer arrays and to take into account radiation into any stratified media at the front-side as well as the back-side of the...

journal_title：Ultrasonics

authors： Wilm M,Reinhardt A,Laude V,Armati R,Daniau W,Ballandras S

更新日期：2005-05-01 00:00:00

abstract：:The goal standard of contrast echocardiography is the absolute measure of myocardial perfusion using a contrast agent. Actually, several contrast agents are developed. All these agents show left ventricular opacification after intravenous injection. However, none of these agents shows an acceptable enhancement of the ...

journal_title：Ultrasonics

authors： Bouakaz A,de Jong N,Cachard C,Jouini K

更新日期：1998-02-01 00:00:00

abstract：:This investigation deals with various new aspects of the sensitivity improvement of a pump-probe laser based acoustic method. A short laser pulse is used to excite a mechanical pulse thermo-elastically. Echoes of these mechanical pulses reaching the surface are causing a slight change of the optical reflectivity. The ...

journal_title：Ultrasonics

authors： Vollmann J,Profunser DM,Dual J

更新日期：2002-05-01 00:00:00

abstract：:A method is proposed to measure the stress on a tightened bolt using an electromagnetic acoustic transducer (EMAT). A shear wave is generated by the EMAT, and a longitudinal wave is obtained from the reflection of the shear wave due to the mode conversion. The ray paths of the longitudinal and the shear wave are analy...

journal_title：Ultrasonics

authors： Ding X,Wu X,Wang Y

更新日期：2014-03-01 00:00:00

abstract：:We demonstrate a new method for a real-time imaging of surface acoustic waves at frequencies up to 1 GHz with picosecond temporal and micron spatial resolutions using an ultrafast optical pump and probe technique combined with a common path interferometer. Using samples with isotropic or anisotropic substrates coated ...

journal_title：Ultrasonics

authors： Sugawara Y,Wright OB,Matsuda O,Gusev VE

更新日期：2002-05-01 00:00:00

abstract：:The acoustic source localization technique for anisotropic plates proposed by the authors in an earlier publication ([1] Kundu et al., 2012) is improved in this paper by adopting some modifications. The improvements are experimentally verified on anisotropic flat and curved composite plates. Difficulties associated wi...

journal_title：Ultrasonics

authors： Nakatani H,Kundu T,Takeda N

更新日期：2014-09-01 00:00:00

abstract：:In acoustic and ultrasonic non-destructive testing techniques, it is sometimes beneficial to concentrate sound energy at a chosen location in space and at a specific instance in time, for example to improve the signal-to-noise ratio or activate the nonlinearity of damage features. Time Reversal (TR) techniques, taking...

journal_title：Ultrasonics

authors： Delrue S,Van Den Abeele K,Bou Matar O

更新日期：2016-04-01 00:00:00

abstract：:The layer-multiple-scattering method is developed to study wave propagation through two-dimensional lattices of cylindrical inclusions in an elastic medium. The lattices are a series of periodically spaced infinite one-dimensional periodic gratings (or rows) of inclusions. The layer-multiple-scattering method allows t...

journal_title：Ultrasonics

authors： Robert S,Conoir JM,Franklin H

更新日期：2006-12-01 00:00:00

abstract：:Sonothrombolysis is one of the most feasible methods for enhancing clot lysis with a recombinant tissue plasminogen activator (rt-PA) in cases of acute ischemic strokes. For safe and efficient clinical practices of sonothrombolysis, accurate estimation of ultrasound transmittance through the human skull is critical. P...

journal_title：Ultrasonics

authors： Wang Z,Komatsu T,Mitsumura H,Nakata N,Ogawa T,Iguchi Y,Yokoyama M

更新日期：2017-05-01 00:00:00

abstract：:Most methods used to measure the thickness of thin liquid or solid surface films and coatings need access to the coated surface. In this work reflected ultrasonic pulses were used to measure a coating thickness from a solid back face. Piezoelectric transducers on the solid back face emitted ultrasound waves and receiv...

journal_title：Ultrasonics

authors： Kanja J,Mills R,Li X,Brunskill H,Hunter AK,Dwyer-Joyce RS

更新日期：2021-02-01 00:00:00

abstract：:It has been established that structural changes in a ferrofluid (formation of clusters) upon the effect of an external magnetic field can be effectively studied by ultrasound spectroscopy. In particular, the resonance absorption of ultrasonic waves enables detection and determination of the size of spherical clusters....

journal_title：Ultrasonics

authors： Józefczak A,Skumiel A,Hornowski T

更新日期：2002-05-01 00:00:00

abstract：:Several experimental studies have demonstrated that ultrasound (US) can accelerate enzymatic fibrinolysis and this effect is further enhanced in the presence of ultrasound contrast agents (UCA). Although UCA have been shown to be safe when administered to ischemic stroke patients, safety information of these agents in...

journal_title：Ultrasonics

authors： Soltani A,Prokop AF,Vaezy S

更新日期：2008-04-01 00:00:00

abstract：:An ultrasonic probe consisting of two optical fiber-based miniaturized transducers for wideband ultrasound emission and detection is employed for the characterization of in vitro biological tissues. In the probe, ultrasound generation is obtained by thermoelastic emission from patterned carbon films in Micro-Opto-Mech...

journal_title：Ultrasonics

authors： Vannacci E,Granchi S,Belsito L,Roncaglia A,Biagi E

更新日期：2017-03-01 00:00:00

abstract：:Ultrasonic vibration has been observed to lower the flow stress necessary to initiate plastic deformation, a phenomenon known as "acoustic softening". This unique effect of ultrasound has been extensively applied in welding, machining, forming of metals, and ultrasonic additive manufacturing to lower the yield stress ...

journal_title：Ultrasonics

authors： Mao Q,Coutris N,Rack H,Fadel G,Gibert J

更新日期：2020-03-01 00:00:00

abstract：:In this paper, we investigated theoretically and experimentally the effect of the conductivity of the film located in the immediate vicinity of the free side of a piezoelectric resonator based on the PZT ceramics on its characteristics. It is shown that with increasing the conductivity of the film at first the paralle...

journal_title：Ultrasonics

authors： Zaitsev BD,Semyonov AP,Teplykh AA,Borodina IA

更新日期：2019-04-01 00:00:00

abstract：:This work is concerned with the reconstruction, from measured (synthetic or real) data, of a 2D penetrable fluid-like object of arbitrary cross-section embedded in a fluid of infinite extent and insonified by a plane acoustic wave. Green's theorem is used to provide a domain integral representation of the scattered fi...

journal_title：Ultrasonics

authors： Guillermin R,Lasaygues P,Sessarego JP,Wirgin A

更新日期：2001-03-01 00:00:00

abstract：:Ultrasonic non-destructive testing of polycrystalline structures can be disturbed by scattering at grain boundaries. Understanding and modeling this so-called "structural noise" is crucial for characterization as well as detection purposes. Structural noise can be considered as a fingerprint of the material under inve...

journal_title：Ultrasonics

authors： Shahjahan S,Rupin F,Aubry A,Chassignole B,Fouquet T,Derode A

更新日期：2014-01-01 00:00:00

abstract：:Experimentally observed dissipated nonlinearity in Lamb wave propagation in composites due to stress-relaxation is reported herein. It was found that the stress relaxation in composite is inherently coupled with the second order nonlinear parameter derived from the Lamb wave modes. Due to the combined effect of intern...

journal_title：Ultrasonics

authors： Patra S,Ahmed H,Saadatzi M,Banerjee S

更新日期：2019-07-01 00:00:00

abstract：:The motivation for this research stems from a need for providing a non-destructive testing method capable of detecting and locating any defects and microstructural variations within armour ceramic components before issuing them to the soldiers who rely on them for their survival. The development of an automated ultras...

journal_title：Ultrasonics

authors： Kesharaju M,Nagarajah R

更新日期：2015-09-01 00:00:00

abstract：:Both pinnae of anaesthetized male guinea-pigs were contused in a reproducible manner and one immediately treated with 0.75 MHz ultrasound at an average therapeutic intensity of 0.61 W cm-2 for a period of 2 min. The lividity and rate of resorption of the rusultant bruises were measured by a photometric method. The res...

journal_title：Ultrasonics

authors： Hustler JE,Zarod AP,Williams AR

更新日期：1978-09-01 00:00:00