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 pits. The finite element mesh is used to describe the region surrounding the corrosion pits while the modal decomposition method permits to determine the waves reflected and transmitted by the damaged area. Simulations make easier the interpretation of some parts of the measured waveform corresponding to superposition of waves diffracted by the corroded area. Numerical results permit to extract significant information from the transmitted waveform and thus to optimize the signal processing for the detection of corrosion at an early stage. Now, we are able to detect corrosion pits down to 80-mum depth distributed randomly on a square centimeter of an aluminum plate. Moreover, thickness variations present on aircraft structures can be discriminated from a slightly corroded area. Finally, using this experimental setup, aircraft structures have been tested.
journal_name
Ultrasonicsjournal_title
Ultrasonicsauthors
Terrien N,Royer D,Lepoutre F,Déom Adoi
10.1016/j.ultras.2007.02.004subject
Has Abstractpub_date
2007-06-01 00:00:00pages
251-65issue
3eissn
0041-624Xissn
1874-9968pii
S0041-624X(07)00028-5journal_volume
46pub_type
杂志文章相关文献
ULTRASONICS文献大全abstract：:The linear wave equation in a lossless medium is time reversible, i.e., every solution p(x, t) has a temporal mirror solution p(x, -t). Analysis shows that time reversal also holds for the lossless nonlinear wave equation. In both cases, time-reversal invariance is violated when losses are present. For nonlinear propa...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(00)00020-2
更新日期：2000-09-01 00:00:00
abstract：:The present study investigated the effect of geometric parameters of the ultrasound instrument during meat salting in order to enhance salt diffusion and salt distribution in pork meat on a lab scale. The effects of probe size (∅2.5 and 1.3cm) and of different distances between the transducer and the meat sample (0.3,...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2017.03.017
更新日期：2018-02-01 00:00:00
abstract：:Images captured during routine clinical transcranial sonography (TCS) examination are of a low resolution, so can be confusing for diagnostic evaluations. Manual segmentation of brain structures (areas of the midbrain and substantia nigra (SN)) that are of special interest cause inter-observer and intra-observer varia...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2012.04.005
更新日期：2013-01-01 00:00:00
abstract：:One of the fundamental theorems in (optical, acoustical, quantum, gravitational) wave scattering is the optical theorem for plane waves, which relates the extinction cross-section to the forward scattering complex amplitude function. In this analysis, the optical theorem is extended for the case of 3D-beams of arbitra...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2016.01.006
更新日期：2016-04-01 00:00:00
abstract：:Ultrasound wave propagation in nanofluids and its rheological behavior has been studied as a function of solid volume fraction, temperature and magnetic field for magnetic nanofluids synthesized in kerosene and transformer oil. Ultrasonic velocity decreases while viscosity increases with increasing volume fraction. Th...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2014.08.017
更新日期：2015-01-01 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：: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
pub_type： 杂志文章
doi：10.1016/s0041-624x(99)00165-1
更新日期：2000-03-01 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：:Recent achievements of nonlinear acoustics concerning the realization of solitons and solitary waves in crystals and their surfaces attained by nanosecond and picosecond laser ultrasonics are discussed and compared. The corresponding pump-probe setups are described, which allow an all-optical contact-free excitation a...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2009.08.003
更新日期：2010-02-01 00:00:00
abstract：:This paper presents the results of the theoretical and 2D FEM modeling excitation and detection of evanescent acoustic waves in piezoelectric plates. By application of 2D ordinary differential equations derived by Auld, we obtained the dispersion curves of A1 and SH1 waves in YX LiNbO3 and YX KNbO3 plates in proximity...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2019.105961
更新日期：2019-11-01 00:00:00
abstract：:Aluminium sheet thickness has been calculated from ultrasonic data obtained using a send-receive, radially polarised electromagnetic acoustic transducer (EMAT). Sheets in the thickness range between 0.1 and 0.5 mm have been measured using this non-contact approach at a stand-off of up to 1.5 mm. Normal incidence shear...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(01)00083-x
更新日期：2001-10-01 00:00:00
abstract：:We develop a new ultrasonic imaging framework for non-destructive testing of an immersed specimen featuring an irregular top surface and demonstrate its capability of accurately depicting the lower surfaces of multiple damages hidden in the specimen. Central to the framework is a multistep angular spectrum approach (A...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2020.106233
更新日期：2020-12-01 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：BACKGROUND AND OBJECTIVE:Acoustic scattering properties of ultrasound contrast agents are useful in extending existing or developing new techniques for biomedical imaging applications. A useful first step in this direction is to investigate the acoustic scattering of a new class of acoustic beams, known as helicoidal h...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2009.09.003
更新日期：2010-03-01 00:00:00
abstract：:The purpose of this study was to investigate practical, safe, easy-to-use, non-cytotoxic, and reliable parameters to apply to an ultrasound (US) naked gene therapy system. The ultrasound pressure at the point of cell exposure was measured using a calibrated hydrophone and the intensity calculated. An acoustic power me...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2004.06.007
更新日期：2004-12-01 00:00:00
abstract：:The electromagnetic acoustic transducers (EMATs) with a meander-line coil possess the capability of generating Lamb waves carrying multiple wavelengths, and the characteristics of multiple wavelengths is analyzed by developing a spatial transversal filter model for the EMAT. It is shown that the characteristics is due...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2013.09.003
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
pub_type： 杂志文章
doi：10.1016/j.ultras.2008.05.008
更新日期：2009-01-01 00:00:00
abstract：:Temperature control of hyperthermia treatments is generally implemented with multipoint feedback system comprised of phased-array transducer, which is complicated and high cost. Our simulations to the acoustic field induced by a self-focused concave spherical transducer (0.5MHz, 9cm aperture width, 8.0cm focal length)...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2010.01.006
更新日期：2010-05-01 00:00:00
abstract：:Several aspects of spectral analysis of bubble transients in Doppler ultrasonic decompression data are discussed. The computation of energy density spectra, using fast Fourier transform techniques for analyzing bubble transients, is described. Spectral analysis of data from probes implanted within animals, using a con...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/0041-624x(77)90026-9
更新日期：1977-05-01 00:00:00
abstract：:This paper describes a laser optical technique for the detection of in-plane (IP) motion of ultrasonic waves propagating in solids. This interference-based laser optical technique includes a tiny square indentation with a width of about 30 microm on the sample surface and a relatively simple optical arrangement. The c...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2006.05.076
更新日期：2006-12-22 00:00:00
abstract：:In many ultrasound applications-especially in the area of medical diagnostics-conventional sensors and particularly piezoelectric hydrophones do not comply with the requirements for "point detectors". It therefore suggests itself to develop methods, which allow ultrasonic fields to be reconstructed from the spatially ...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(02)00346-3
更新日期：2002-08-01 00:00:00
abstract：:High-frequency calibration of hydrophones is becoming increasingly important, both for clinical and scientific applications of ultrasound, and user safety. At present, the calibrations available routinely to the user community extend to 60 MHz. However, hydrophones that can measure beyond this are available, and ultra...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2020.106218
更新日期：2020-12-01 00:00:00
abstract：:A novel nanocomposite-inspired in-situ broadband ultrasonic sensor previously developed, with carbon black as the nanofiller and polyvinylidene fluoride as the matrix, was networked for acousto-ultrasonic wave-based passive and active structural health monitoring (SHM). Being lightweight and small, this kind of sensor...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2017.03.007
更新日期：2017-07-01 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
abstract：:This paper suggests a method for high-sensitivity damage detection. The method is based on pitch-catch measurements of Lamb waves combined with a baseline subtraction technique in the frequency-wavenumber domain. Small amplitude converted modes, generated during the interaction of propagating waves with damage, can th...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2013.08.010
更新日期：2014-02-01 00:00:00
abstract：:Surface wave motions generated by a time-harmonic point load applied at the surface of an isotropic linearly elastic half-space are conventionally solved by the use of integral transform techniques. The inverse transforms, are often complicated and will not always yield closed-form solutions. In this paper expressions...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/j.ultras.2014.05.003
更新日期：2014-09-01 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
pub_type： 杂志文章
doi：10.1016/j.ultras.2020.106244
更新日期：2021-02-01 00:00:00
abstract：:Even though friction is one of the oldest problems in physics many aspects of friction processes are not clear today. We present an experimental setup, which permits the study of tribological systems by measuring the dissipated heat at the interface of two surfaces during a friction process with a time resolution of 1...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/s0041-624x(99)00062-1
更新日期：2000-03-01 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：:The paper describes a new pocket size instrument called the "Cardiophone" for the diagnosis of cardiac dysfunction. It is a continuous wave swept frequency ultrasonic echo-location system which produces dynamic auditory signals corresponding to the positional change of internal structures of the heart. The four valves...
journal_title：Ultrasonics
pub_type： 杂志文章
doi：10.1016/0041-624x(77)90031-2
更新日期：1977-05-01 00:00:00
