Abstract：
:An improved method for ultrasonic location of multiple flaws using perpendicular ultrasonic arrays, working in near-field conditions, is presented. The method uses the pulse-echo technique and is based on the processing of the information acquired by both the elemental emitting transducers and their adjacent ones. This type of processing improves the performance of a previous method that sometimes presents limitations for the detection of multiples flaws. This new method is applied to a set of ultrasonic traces, obtained with an ultrasonic prototype specifically designed for testing this method, showing the improvement obtained in imaging results.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Rodríguez MA,Ramos A,San Emeterio JLdoi
10.1016/j.ultras.2006.05.107subject
Has Abstractpub_date
2006-12-22 00:00:00pages
e1105-9eissn
0041-624Xissn
1874-9968pii
S0041-624X(06)00139-9journal_volume
44 Suppl 1pub_type
杂志文章相关文献
ULTRASONICS文献大全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
pub_type： 杂志文章
doi：10.1016/j.ultras.2008.06.002
更新日期：2008-11-01 00:00:00
abstract：:Ultrasound evaluation permits the state of rocks to be determined quickly and cheaply, satisfying the demands faced by today's producers of ornamental stone, such as environmental sustainability, durability and safety of use. The basic objective of the present work is to analyse and develop the usefulness of ultrasoun...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2013.06.006
更新日期：2014-01-01 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
pub_type： 杂志文章
doi：10.1016/j.ultras.2003.12.005
更新日期：2004-04-01 00:00:00
abstract：:In this paper the behaviour of strongly nonlinear waves in axisymmetric resonators is experimentally and numerically studied. Experiments are carried out in a cylindrical cavity, which transversal dimension is bigger than the longitudinal one, excited by a narrow band transducer. The quality factor and displacement am...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2005.02.001
更新日期：2005-08-01 00:00:00
abstract：:The objective of this paper is to develop a nondestructive method for estimating the fracture toughness (K(IC)) of CrMoV steels used as the rotor material of steam turbines in power plants. To achieve this objective, a number of CrMoV steel samples were heat-treated, and the fracture appearance transition temperature ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(03)00154-9
更新日期：2003-09-01 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
pub_type： 杂志文章
doi：10.1016/j.ultras.2008.03.004
更新日期：2008-12-01 00:00:00
abstract：:This paper presents a study on the worsening caused by a random perturbation of the weighting window (modeling, in this way, the uncertainty on the channel sensitivity), or by an alteration of the shape of the transmitted pulse, for a wideband array. In the stability evaluation, main-lobe width and signal to noise rat...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2003.12.006
更新日期：2004-04-01 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
pub_type： 杂志文章
doi：10.1016/j.ultras.2010.12.007
更新日期：2011-07-01 00:00:00
abstract：:In this paper, te edge mode variation is studied with three different methods: the reciprocal work method, already used by Torvik [J. Acoust. Soc. Am. 41 (1967) 346] to model this phenomenon, the S-parameter method and a finite element model that are applied for the first time to the study of the edge resonance. Moreo...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(02)00391-8
更新日期：2003-01-01 00:00:00
abstract：:A method for fabricating disposable membrane hydrophones is presented. The disposable hydrophones are intended for onetime use in such damaging environments as chemically contaminating fluids and high-amplitude (peak amplitude ∼100MPa) shock wave fields, where the use of commercial membrane hydrophones is not recommen...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2017.05.016
更新日期：2017-11-01 00:00:00
abstract：:We developed SH (shear horizontal) surface acoustic wave (SAW) sensors to detect protein molecules in liquid solutions applying a particular antibody thin film on the delay line of transverse SAW devices. The antibody investigated was human-immuno-globulin G (HigG) to hold the antigens (anti-HigG) in the protein solut...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2004.01.039
更新日期：2004-04-01 00:00:00
abstract：:It is now accepted that an effective way to investigate the elastic properties of soft tissues is to generate a localized transient acoustic radiation force and to follow the associated displacements in the time/space domain. Shear waves induced by this stress field are particularly interesting in this kind of medium ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2006.06.022
更新日期：2006-12-22 00:00:00
abstract：:Intraluminal (within the alimentary tract) thermal surgery has been shown to be a useful therapeutic option when extracorporeal focused ultrasound applicators cannot be used since their beam may not reach the target site. If plane transducers are used for the treatment of alimentary tract tumours, the applicator must ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2004.01.088
更新日期：2004-04-01 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
pub_type： 杂志文章
doi：10.1016/j.ultras.2015.01.003
更新日期：2015-04-01 00:00:00
abstract：:Based on the original combination of picosecond acoustics and diamond anvils cell, recent improvements to accurately measure hypersonic sound velocities of liquids and solids under extreme conditions are described. To illustrate the capability of this technique, results are given on the pressure and temperature depend...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2014.04.011
更新日期：2015-02-01 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
pub_type： 杂志文章
doi：10.1016/j.ultras.2011.11.010
更新日期：2012-04-01 00:00:00
abstract：:In this paper, we propose a semi-analytical isogeometric analysis(S-IGA) approach in the twist space to investigate the dispersive properties in helical thread waveguides, which combines the advantages of the spectral approach and IGA. The convergence and accuracy of the proposed method are discussed, by comparing S-I...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2017.06.004
更新日期：2018-02-01 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
pub_type： 杂志文章
doi：10.1016/j.ultras.2016.11.008
更新日期：2017-03-01 00:00:00
abstract：:Two merits of the surface acoustic wave (SAW) device are its high energy density and small size. However, the driving frequency is around 10 MHz or higher. In spite of the difficulties involved with high frequency, the high energy density is attractive for actuator applications. The SAW linear motor's no load speed an...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(99)00087-6
更新日期：2000-03-01 00:00:00
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
pub_type： 杂志文章
doi：10.1016/j.ultras.2012.10.018
更新日期：2013-03-01 00:00:00
abstract：:This study investigated the effect of LIPUS on fracture healing when fractures were exposed to ultrasound at three axial distances: z=0 mm, 60 mm, and 130 mm. We applied LIPUS to rat fracture at these three axial distances mimicking the exposure condition of human fractures at different depths under the soft tissue. M...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2013.10.013
更新日期：2014-03-01 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
pub_type： 杂志文章
doi：10.1016/j.ultras.2006.09.002
更新日期：2006-12-01 00:00:00
abstract：:To eliminate the limitations of the conventional sound field separation methods which are only applicable to regular surfaces, a sound field separation method based on combined integral equations is proposed to separate sound fields directly in the spatial domain. In virtue of the Helmholtz integral equations for the ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2014.06.007
更新日期：2014-12-01 00:00:00
abstract：:This research paper is the experimental study to investigate the effect of ultrasound sensitivity in the pure methane gas space as the pressure and sensor distance increases. We offer the solution to overcome the low sensitivity characteristics of ultrasonic sensors in the methane gas space. This proposal shows the ph...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2019.105970
更新日期：2019-11-01 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
pub_type： 杂志文章
doi：10.1016/j.ultras.2020.106130
更新日期：2020-07-01 00:00:00
abstract：:As biotechnology develops, techniques for manipulating and separating small particles such as cells and DNA are required in the life sciences. This paper investigates on-chip manipulation of microparticles in small channels by using ultrasonic vibration. The chip consists of a rectangular glass substrate with a cross-...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2016.11.026
更新日期：2017-08-01 00:00:00
abstract：:In previous work, we have demonstrated the use of single-holed Armoured Microbubbles (AMBs) for microfluidic mixing and self-propulsion. AMBs are hollow partial spheres, inside which we capture a bubble. Under ultrasound, the bubble oscillates, generating a streaming flow with velocities of 1-100 mm/s in water. In thi...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2019.106054
更新日期：2020-03-01 00:00:00
abstract：:Explicit integral representations for the wave fields generated by air-coupled or underwater transducers in an acoustic medium with a submerged elastic (metallic or laminate composite) plate are obtained in the form of path Fourier integrals. Together with the far-field asymptotics for the incident, reflected, transmi...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2018.10.001
更新日期：2019-04-01 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
pub_type： 杂志文章
doi：10.1016/j.ultras.2007.06.001
更新日期：2007-12-01 00:00:00
abstract：:This study considers the acoustic streaming in water produced by a lithotripsy pulse. Particle image velocimetry (PIV) method was employed to visualize the acoustic streaming produced by an electromagnetic shock wave generator using video images of the light scattering particles suspended in water. Visualized streamin...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2005.09.004
更新日期：2006-02-01 00:00:00
