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 now report an investigation of the potential of LiNbO(3) composites for use in high temperature transducers for non-destructive testing (NDT). LiNbO(3) composites of 1-3 connectivity in room temperature vulcanising (RTV) sealant and cement matrices were fabricated by the dice and fill method. The RTV and the cement are specified to withstand temperatures up to 350 degrees C and 1600 degrees C, respectively. The composites have been characterized by electrical impedance measurement at ambient and elevated temperatures. In array configuration, transmit-receive signals from the back wall of a steel specimen were obtained at room temperature with good signal to noise ratio. High temperature measurements were made at temperatures up to 180 degrees C for the RTV composite and 360 degrees C for the cement composite configured as single element transducers. Temperature cycling has also been investigated and the new composite materials have been demonstrated to withstand several cycles without deterioration. It is concluded that they may contribute toward a solution to presently unsolved problems in NDT at elevated temperatures.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Schmarje N,Kirk KJ,Cochran Sdoi
10.1016/j.ultras.2007.06.001subject
Has Abstractpub_date
2007-12-01 00:00:00pages
15-22issue
1-4eissn
0041-624Xissn
1874-9968pii
S0041-624X(07)00061-3journal_volume
47pub_type
杂志文章相关文献
ULTRASONICS文献大全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
pub_type: 杂志文章
doi:10.1016/j.ultras.2019.106005
更新日期:2020-03-01 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
pub_type: 杂志文章
doi:10.1016/s0041-624x(96)00078-9
更新日期:1996-12-01 00:00:00
abstract::Sonoelectrochemistry is undergoing a reemerging activity in the last years with an increasing number of papers appearing in a wide range of peer review journals. Applied studies which cover environmental treatments, synthesis or characterization of nanostructures, polymeric materials synthesis, analytical procedures, ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2009.09.022
更新日期:2010-02-01 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
pub_type: 杂志文章
doi:10.1016/j.ultras.2005.03.010
更新日期:2005-08-01 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
pub_type: 杂志文章
doi:10.1016/j.ultras.2010.12.008
更新日期:2011-07-01 00:00:00
abstract::Ultrasonic wave tunneling through seriously mismatched media, such as steel and water, is possible only when the frequency matches the resonance of the steel plate. But it is nearly impossible to realize continuous wave tunneling if the low acoustic impedance media is air because the transducer frequency cannot be mad...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2017.07.018
更新日期:2018-01-01 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::Lactic acid, psychrophilic, and mesophilic bacteria, Escherichia coli, Salmonella spp. and Staphylococcus aureus were enumerated on chicken breasts after treatment with different high intensity ultrasound (frequency 40 kHz, intensity 9.6 W/cm-2) application times (0, 30, and 50 min) and packaging atmospheres (aerobic ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2018.01.001
更新日期:2020-03-01 00:00:00
abstract::The propagation of ultrasound through an austenitic weld is investigated experimentally as well as in a numerical simulation. The weld is insonified at normal incidence to the fusion line with a longitudinal contact transducer. In order to experimentally trace the ultrasound through the weld, slices of different thick...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(99)00103-1
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
pub_type: 杂志文章
doi:10.1016/s0041-624x(02)00232-9
更新日期:2002-05-01 00:00:00
abstract::In this paper, the development of modified beamforming methods, Filtered Delay Weight Multiply and Sum (F-DwMAS) and Filtered Delay Euclidian-Weighted Multiply and Sum (F-DewMAS), are reported. These methods were investigated on a minimum-redundancy synthetic aperture technique, called as 2 element Receive Synthetic A...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2020.106293
更新日期:2021-02-01 00:00:00
abstract::Guided acoustic waves, such as Lamb waves, are widely applied for material characterization, sensing of liquids and the generation of streaming in liquids. There are numerical simulation tools for the prediction of their propagation near a solid-liquid boundary but a demand for complementary measurement techniques for...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2019.105955
更新日期:2019-11-01 00:00:00
abstract::This work was devoted to the development of a health monitoring system assigned to aerospace applications. Those applications concerned the detection of damaging impacts and debonding between stiffeners and composite skins, since they are the major causes of in-service damage of aircraft structures. The chosen health ...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2004.01.058
更新日期:2004-04-01 00:00:00
abstract::In this paper we discuss the existence of translational and rotational displacements of a sphere submitted to a tangential contact force. On the basis of the Bogdanov and Skvortsov's works [A.N. Bogdanov, A.T. Skvortsov, Sov. Phys. Acoust. 38 (1992) 224-226.] the dispersion equation has been established and solved for...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2006.07.019
更新日期:2006-12-01 00:00:00
abstract::Since the identification of micro-cracks in engineering materials is very valuable in understanding the initial and slight changes in mechanical properties of materials under complex working environments, numerical simulations on the propagation of the low frequency S0 Lamb wave in thin plates with randomly distribute...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2017.04.004
更新日期:2017-08-01 00:00:00
abstract::The ultrasound-induced harmonic microbubble response spectrum is known to shift to lower frequencies with increasing tissue attenuation. We hypothesized that this shift could be reproducibly detected in received broadband radiofrequency spectra. We used an automatic Gaussian curve-fitting technique to measure the mean...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(02)00397-9
更新日期:2003-03-01 00:00:00
abstract::To increase the sensitivity of Lamb waves to hidden corrosion in aircraft structures, a preliminary step is to understand the phenomena governing this interaction. A hybrid model combining a finite element approach and a modal decomposition method is used to investigate the interaction of Lamb modes with corrosion pit...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2007.02.004
更新日期:2007-06-01 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
pub_type: 杂志文章
doi:10.1016/s0041-624x(99)00168-7
更新日期:2000-01-01 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
pub_type: 杂志文章
doi:10.1016/s0041-624x(99)00095-5
更新日期:2000-03-01 00:00:00
abstract::Mechanical properties of biological tissue represent important diagnostic information and are of histological and pathological relevance. In order to obtain non-invasively mechanical properties of tissue, we developed a real-time strain imaging system for clinical applications. The output data of this system also allo...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2006.06.007
更新日期:2006-12-22 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
pub_type: 杂志文章
doi:10.1016/j.ultras.2010.10.001
更新日期:2011-04-01 00:00:00
abstract::A new type of optical fiber hydrophone is constructed with a fiber Bragg grating (FBG) based on the intensity modulation of laser light in an FBG under the influence of sound pressure. The FBG hydrophone shows linearity, with dynamic range about 70 dB. It can measure amplitude and phase of an acoustic field in real ti...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/s0041-624x(99)00105-5
更新日期:2000-03-01 00:00:00
abstract::In the food industry, ultrasonic cutting is used to improve separation by a reduction of the cutting force. This reduction can be attributed to the modification of tool-workpiece interactions at the cutting edge and along the tool flanks because of the superposition of the cutting movement with ultrasonic vibration of...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2009.03.001
更新日期:2009-06-01 00:00:00
abstract::It is well known that harmonic bounded Gaussian beams undergo a transformation into two bounded beams upon reflection on a solid immersed in a liquid. The effect is known as the Schoch effect and can be found at the Rayleigh angle for thick plates and at the different Lamb angles for thin plates. Here, a study is made...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2006.05.205
更新日期:2006-12-22 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::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
pub_type: 杂志文章
doi:10.1016/j.ultras.2017.07.006
更新日期:2018-01-01 00:00:00
abstract::The microwave ablation has become an important manner for tumor treatment. In this paper, we proposed a new method for evaluation of microwave-induced thermal lesions using the wavelet analysis of the mean scatterer spacing (MSS). First, the ultrasonic radiofrequency (RF) data of normal and coagulated porcine liver ti...
journal_title:Ultrasonics
pub_type: 杂志文章
doi:10.1016/j.ultras.2013.03.018
更新日期:2013-09-01 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
pub_type: 杂志文章
doi:10.1016/j.ultras.2012.08.004
更新日期:2012-12-01 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
pub_type: 杂志文章
doi:10.1016/j.ultras.2011.05.011
更新日期:2011-12-01 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