Acousto-optic interaction with leaky surface acoustic waves in Y-cut LiTaO3 crystals.

abstract：:We studied thickness-shear and thickness-twist vibrations of a monolithic, two-pole crystal filter made from a plate of AT-cut quartz. The scalar differential equations derived by Tiersten and Smythe for electroded and unelectroded quartz plates were employed which are valid for both the fundamental and the overtone m...

journal_title：Ultrasonics

authors： Zhao Z,Qian Z,Wang B,Yang J

更新日期：2015-04-01 00:00:00

abstract：:One of the important issues in the field of ultrasound medical imaging using contrast agents is the development of techniques able to separate the response of the contrast media from that of the biological tissues. In the literature, one can find various solutions involving the use of multiple transmitted signals and ...

journal_title：Ultrasonics

authors： Crocco M,Palmese M,Sciallero C,Trucco A

更新日期：2009-01-01 00:00:00

abstract：:Periodic composite ultrasonic transducers offer many advantages but the periodic pillar architecture can give rise to unwanted modes of vibration which interfere with the piston like motion of the fundamental thickness mode. In this paper, viscoelastic loss is incorporated into a three-dimensional plane wave expansion...

journal_title：Ultrasonics

authors： Orr LA,Mulholland AJ,O'Leary RL,Hayward G

更新日期：2008-12-01 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：:The Mössbauer and X-rays analysis of as-received Fe-powder and Fe-powder mechanically alloyed with C using high power ultrasonics were carried out. The powder blend of Fe-powder and graphite was processed in He environment during 5 to 50 h. The dissolution of carbon in iron particles and inhomogeneous distribution of ...

journal_title：Ultrasonics

authors： Nadutov VM,Mordyuk BN,Prokopenko GI,Gavrilenko IS

更新日期：2004-04-01 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：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：: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 new topological structure for the Langevin-type ultrasonic transducer is proposed and investigated. The two cylindrical terminal blocks are conically shaped with four supporting plates each, and two cooling fins are disposed at the bottom of terminal blocks, adjacent to the piezoelectric rings. Experi...

journal_title：Ultrasonics

authors： Lu X,Hu J,Peng H,Wang Y

更新日期：2017-03-01 00:00:00

abstract：:A technique using pulsed High Intensity Focused Ultrasound (HIFU) to destroy deep-seated solid tumors is a promising noninvasive therapeutic approach. A main purpose of this study was to design and test a HIFU transducer suitable for preclinical studies of efficacy of tested, anti-cancer drugs, activated by HIFU beams...

journal_title：Ultrasonics

authors： Kujawska T,Secomski W,Byra M,Postema M,Nowicki A

更新日期：2017-04-01 00:00:00

abstract：:The location of continuous acoustic emission sources is a difficult problem of non-destructive testing. This article describes one-dimensional location of continuous acoustic emission sources by using an intelligent locator. The intelligent locator solves a location problem based on learning from examples. To verify w...

journal_title：Ultrasonics

authors： Kosel T,Grabec I I,Muzic P

更新日期：2000-03-01 00:00:00

abstract：:Stroboscopic X-ray topography at the synchrotron beam line was used to visualize the propagation of a 580 MHz surface acoustic waves (SAW) in LiNbO3 crystals. For this purpose, the X-ray bursts coming from the synchrotron storage ring with periodicity of 5.68 MHz were synchronized with the SAW frequency in a phase-loc...

journal_title：Ultrasonics

authors： Shilo D,Zolotoyabko E

更新日期：2002-05-01 00:00:00

abstract：MOTIVATION:Commercial ultrasound machines in the past did not provide the ultrasound researchers access to raw ultrasound data. Lack of this ability has impeded evaluation and clinical testing of novel ultrasound algorithms and applications. OBJECTIVES:Recently, we developed a flexible ultrasound back-end where all th...

journal_title：Ultrasonics

authors： Shamdasani V,Bae U,Sikdar S,Yoo YM,Karadayi K,Managuli R,Kim Y

更新日期：2008-07-01 00:00:00

abstract：:Acoustic scattering phenomena from complex immersed elastic shells are studied by high-speed Schlieren visualization for spark-generated spherical quasi-Dirac excitations. The situations considered are air-filled cylindrical shells under normal insonification and air-filled cylindrical shells soldered at one end with ...

journal_title：Ultrasonics

authors： Derbesse L,Pernod P,Latard V V,Merlen A,Decultot D,Touraine N,Maze G

更新日期：2000-03-01 00:00:00

abstract：:Speckle tracking methods overcome the major limitations of current Doppler methods for flow imaging and quantification: angle dependence and aliasing. In this paper, we review the development of speckle tracking, with particular attention to the advantages and limitations of two-dimensional algorithms that use a singl...

journal_title：Ultrasonics

authors： Bohs LN,Geiman BJ,Anderson ME,Gebhart SC,Trahey GE

更新日期：2000-03-01 00:00:00

abstract：:A nonlinear ultrasonic method is proposed based on a group of newly discovered wave triplets where two primary codirectional shear-horizontal SH0 waves mix in a weakly nonlinear plate and generate a cumulative S0 Lamb wave at the sum frequency. Theoretical analyses show that any combination of two primary SH0 waves wh...

journal_title：Ultrasonics

authors： Shan S,Hasanian M,Cho H,Lissenden CJ,Cheng L

更新日期：2019-07-01 00:00:00

abstract：:We analyze experimentally and theoretically the sound propagation velocity of P-waves in granular media made of micrometer-size magnetite particles under an external magnetic field. The sound velocity is measured in a coherent (long-wavelength) regime of propagation after a controlled sample preparation consisting of ...

journal_title：Ultrasonics

authors： Botello FR,Quintanilla MAS,Castellanos A,Grekova EF,Tournat V

更新日期：2018-01-01 00:00:00

abstract：:As known, anomalous resisto-acoustic effect is a fundamental property for weakly inhomogeneous piezoactive waves (Bleustein-Gulyaev, Love, and some leaky waves). It consists in that the velocity of aforementioned waves first increases, achieves its maximum, and only then decreases with increasing conductance of a laye...

journal_title：Ultrasonics

authors： Kuznetsova IЕ,Zaitsev BD

更新日期：2015-05-01 00:00:00

abstract：:Predominant physical phenomenon in highly scattering materials is the attenuation due to dispersion. Therefore, received echo has high frequencies more severely attenuated than low frequencies and the structural noise can be modeled as a non-stationary random process. Most of the proposed techniques for enhancing the ...

journal_title：Ultrasonics

authors： Izquierdo MA,Hernández MG,Anaya JJ

更新日期：2006-12-22 00:00:00

abstract：:In practical cardiology, a stethoscope based auscultation has been used to reveal the patient's clinical status. Recently, several hand-held echo devices are going on market and they are expected to play a role as "visible" auscultation instead of stethoscope. We have developed a portable and inexpensive echo device w...

journal_title：Ultrasonics

authors： Saijo Y,Nitta S,Kobayashi K,Arai H,Nemoto Y

更新日期：2004-04-01 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：:The present investigation concerns the propagation of surface waves at the vacuum-solid interface of a solid which is isotropic and thermoviscoelastic, i.e., for which the effects of heat conductivity need to be taken into account. Calculations show that, in addition to the Rayleigh wave, a thermal surface wave propag...

journal_title：Ultrasonics

authors： Deschamps M,Poncelet O,Dilhaire S,Claeys W

更新日期：2000-07-01 00:00:00

abstract：:This paper describes ultrasonic measurements of normal and tangential stiffnesses of the contacting interface between polished aluminum blocks subjected to nominal contact pressures up to about 3.8 MPa. These stiffnesses were evaluated by ultrasonic spectroscopy methods for the bulk (longitudinal and transverse) wave ...

journal_title：Ultrasonics

authors： Biwa S,Hiraiwa S,Matsumoto E

更新日期：2007-12-01 00:00:00

abstract：:A split spectrum processing technique using a novel moving bandwidth minimization (MBM) method was developed to detect multiple specular targets having different spectral characteristics. Mathematical morphology (MM) algorithms were also implemented in order to compare the results. An experimental approach to optimal ...

journal_title：Ultrasonics

authors： Grevillot M,Cudel C,Meyer JJ,Jacquey S

更新日期：1999-09-01 00:00:00

abstract：:An experimental ultrasonic sonar for use as a sensory aid with blind children is described. Novel signal processing techniques make the aid relatively simple to construct, yet allow many of its parameters to be changed in the field. In particular, the aid has two features, a variable range code and an automatic level...

journal_title：Ultrasonics

authors： Boys JT,Strelow ER,Clark GR

更新日期：1979-01-01 00:00:00

abstract：:For medical high frequency acoustic imaging purposes the reduction in size of a single transducer element for one-dimensional and even more for two-dimensional arrays is more and more limited by fabrication and cabling technology. In the fields of industrial distance measurement and simple object recognition low cost ...

journal_title：Ultrasonics

authors： Eccardt PC,Niederer K

更新日期：2000-03-01 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：: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：:Today, sophisticated instruments and algorithms used for process control allow the efficient production of substances with the quality guaranteed to the customer. However, production and management techniques are changing. This article aims to analyze trends resulting from those changes from the point of view of ultra...

journal_title：Ultrasonics

authors： Püttmer A

更新日期：2006-12-22 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