Development of an ultrasonic linear motor with ultra-positioning capability and four driving feet.

abstract：:Chemical mechanical polishing (CMP) is the primary method to realize the global planarization of silicon wafer. In order to improve this process, a novel method which combined megasonic vibration to assist chemical mechanical polishing (MA-CMP) is developed in this paper. A matching layer structure of polishing head w...

journal_title：Ultrasonics

authors： Zhai K,He Q,Li L,Ren Y

更新日期：2017-09-01 00:00:00

abstract：:The Total Focusing Method (TFM) yields a focused image in emission and in reception while Phased Array (PA) imaging provides Dynamic Depth Focusing (DDF) in reception only. Besides, most NDE applications have two propagation media, where refraction at the interface complicates time-of-flight (TOF) and focal law comput...

journal_title：Ultrasonics

authors： Cruza JF,Camacho J,Mateos R,Fritsch C

更新日期：2019-11-01 00:00:00

abstract：:Lithium niobate, LiNbO(3), is a piezoelectric material well known for its high Curie temperature. However, it has often been neglected for use in ultrasonic transducers because of its low electro-mechanical coupling coefficients. Recent advances in signal processing have made this disadvantage less significant and we ...

journal_title：Ultrasonics

authors： Schmarje N,Kirk KJ,Cochran S

更新日期：2007-12-01 00:00:00

abstract：:We present a method to generate sub-microsecond quasi-unipolar pressure pulses. Our approach is based on the laser irradiation of a thin copper wire submerged in water. The acoustic waveforms were recorded using two different, well characterized, wideband detection techniques: piezoelectric and optical interferometry....

journal_title：Ultrasonics

authors： González MG,Riobó LM,Ciocci Brazzano L,Veiras FE,Sorichetti PA,Santiago GD

更新日期：2019-09-01 00:00:00

abstract：:The increasing number of concrete structures with symptoms of premature deterioration due to environmental action demands procedures to estimate the durability of this type of component. Concrete durability is related to porosity, which determines the intensity of interactions of the material with aggressive agents. T...

journal_title：Ultrasonics

authors： Hernandez MG,Izquierdo MA,Ibanez A,Anaya JJ,Ullate LG

更新日期：2000-03-01 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：:A new method of spatial compound imaging is presented that improves image quality without the usual requirement to decrease the frame rate. The new method of imaging utilizes three transducers for data acquisition. The transducer located at the center of the transducer system is a phased array probe that acts as both ...

journal_title：Ultrasonics

authors： Behar V,Adam D,Friedman Z

更新日期：2003-07-01 00:00:00

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：:A numerical study is presented to show the potential for using vibroacoustic-based experiments to identify elastic material properties of orthotropic cylindrical vessels immersed in fluids. Sensitivity analyses and a simulated inverse problem are shown to quantify the potential for material characterization through th...

journal_title：Ultrasonics

authors： Rosario DE,Brigham JC,Aquino W

更新日期：2008-11-01 00:00:00

abstract：:The aim of this work was to show the applicability of light diffraction tomography on airborne ultrasound in the frequency range 40 kHz-2 MHz. Seven different air-coupled transducers were measured to show the method's performance regarding linearity, absolute pressure measurements, phase measurements, frequency respon...

journal_title：Ultrasonics

authors： Almqvist M,Holm A,Persson HW,Lindström K

更新日期：2000-01-01 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：:Surface and quasi-longitudinal acoustic wave properties have been investigated in potassium titanyl arsenate (KTiOAsO₄, KTA) single crystals for the first time. Surface acoustic wave (SAW) velocity, electromechanical coupling coefficient and power flow angle characteristics have been obtained in rotated Y-cut of KTA c...

journal_title：Ultrasonics

authors： Taziev RM

更新日期：2014-02-01 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：:Ultrasound has been used to non-destructively assess the quality of many foods such as meat, fish, vegetables and dairy products. This paper addresses the applications of low intensity ultrasonics in the cheese manufacturing processes and highlights the areas where ultrasonics could be successfully implemented in the ...

journal_title：Ultrasonics

authors： Benedito J,Carcel JA,Gonzalez R,Mulet A

更新日期：2002-05-01 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：: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

abstract：:Numerical simulations of bubble oscillations in liquid water irradiated by an ultrasonic wave are performed for various acoustic amplitudes and various ambient pressures. In the numerical simulations, effect of non-equilibrium evaporation and condensation of water vapor at the bubble wall and that of chemical reaction...

journal_title：Ultrasonics

authors： Yasui K,Tuziuti T,Iida Y

更新日期：2004-04-01 00:00:00

abstract：:In ultrasonic non-destructive testing of materials with a coarse-grained structure the scattering from the grains causes backscattering noise, which masks flaw echoes in the measured signal. Several filtering methods have been proposed for improving the signal-to-noise ratio. In this paper we present a comparative stu...

journal_title：Ultrasonics

authors： Matz V,Smid R,Starman S,Kreidl M

更新日期：2009-12-01 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：:Non-linear acoustic oscillations of gas bubbles immersed in viscoelastic fluids are theoretically studied. The problem is formulated by considering a constitutive equation of differential type with an interpolated time derivative. With the aid of this rheological model, fluid elasticity, shear thinning viscosity and e...

journal_title：Ultrasonics

authors： Jiménez-Fernández J,Crespo A

更新日期：2005-08-01 00:00:00

abstract：:An eight-channel ultrasonic detecting device for microbiological quality evaluation of packed liquid foods is presented in this paper. This device makes possible a non-invasive detection of the microbial growth in liquid foods with no need to open the carton-based packages where they are contained. Thermal and humidit...

journal_title：Ultrasonics

authors： Elvira L,Sampedro L,Montero de Espinosa F,Matesanz J,Gómez-Ullate Y,Resa P,Echevarría FJ,Iglesias JR

更新日期：2006-12-01 00:00:00

abstract：:Geometrical and material property changes cause deviations in the resonant conditions used for noncollinear wave mixing. These deviations are predicted and observed using the SV(ω1)+L(ω2)→L(ω1+ω2) interaction, where SV and L are the shear vertical and longitudinal waves, respectively, and ω1, ω2 are their frequencies....

journal_title：Ultrasonics

authors： Demčenko A,Mainini L,Korneev VA

更新日期：2015-03-01 00:00:00

abstract：:Local Defect Resonance (LDR) is exploited for non-destructive testing (NDT) by using ultrasonic vibrations to get a localized resonant activation of defected zones. The LDR technique relies on the local stiffness difference between the defect and the sound material. Analyzing the structure's displacement field at this...

journal_title：Ultrasonics

authors： Segers J,Hedayatrasa S,Poelman G,Van Paepegem W,Kersemans M

更新日期：2020-07-01 00:00:00

abstract：:Forced fluid flow can cause the enhancement of multibubble sonoluminescence (SL) under suitable conditions. The effect of directional flow with a circulator is similar to that of rotating flow with a stirrer. The mechanism of the enhancement is that both flows prevent cavitation bubbles from coalescing and clustering,...

journal_title：Ultrasonics

authors： Hatanaka S,Mitome H,Yasui K,Hayashi S

更新日期：2006-12-22 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：:Angle beam wedge transducers are widely used in nonlinear Rayleigh wave experiments as they can generate Rayleigh wave easily and produce high intensity nonlinear waves for detection. When such a transducer is used, the spurious harmonics (source nonlinearity) and wave diffraction may occur and will affect the measure...

journal_title：Ultrasonics

authors： Zhang S,Li X,Jeong H,Hu H

更新日期：2018-09-01 00:00:00

abstract：:The propagation of thickness shear waves in a periodically corrugated quartz crystal plate is investigated in the present paper using a power series expansion technique. In the proposed simulation model, an equivalent continuity of shear stress moment is introduced as an approximation to handle sectional interfaces wi...

journal_title：Ultrasonics

authors： Li P,Cheng L

更新日期：2017-05-01 00:00:00

abstract：:Our study aims at the creation of a numerical toolbox that describes wave propagation in samples containing internal contacts (e.g. cracks, delaminations, debondings, imperfect intergranular joints) of known geometry with postulated contact interaction laws including friction. The code consists of two entities: the co...

journal_title：Ultrasonics

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

更新日期：2018-01-01 00:00:00

abstract：:This paper presents a study on topology optimization of novel material microstructural configurations to achieve directional elastic wave propagation through maximization of partial band gaps. A waveguide incorporating a periodic-microstructure material may exhibit different propagation properties for the plane elasti...

journal_title：Ultrasonics

authors： He J,Kang Z

更新日期：2018-01-01 00:00:00

abstract：BACKGROUND:Generalized coherence factor (GCF) can be adaptively estimated from channel data to suppress sidelobe artifacts. Conventionally, Fast Fourier Transform (FFT) is utilized to calculate the full channel spectrum and suffers from high computation load. In this work, autocorrelation (AR)-based algorithm is utiliz...

journal_title：Ultrasonics

authors： Shen CC,Xing YQ,Jeng G

更新日期：2016-12-01 00:00:00