Differentiate low impedance media in closed steel tank using ultrasonic wave tunneling.

abstract：:In most of industries as aeronautics, aerospace and nuclear, the main part of the ultrasonic testing is carried out directly in touch with the inspected component. Among others, the cooling piping of French pressurized water reactor comprises many welding components with complex geometry: elbows, butt welds, nozzles. ...

journal_title：Ultrasonics

authors： Roy O,Mahaut S,Casula O

更新日期：2002-05-01 00:00:00

abstract：:This paper focuses on transmission characteristics of fundamental symmetric Lamb mode (So) at the junction of a main waveguide and sub-waveguides in composite laminates. Numerical simulations on transmission of So from the main to sub-waveguide revealed that transmission factors of the modes depend on stacking sequenc...

journal_title：Ultrasonics

authors： Ramadas C

更新日期：2016-01-01 00:00:00

abstract：:In this paper, an experimental study of the effect of the resonator shape on the performance of a traveling-wave thermoacoustic engine is presented. Two different resonators were tested in the thermoacoustic-Stirling heat. One resonator is an iso-diameter one, and the other is a tapered one. To have a reasonable compa...

journal_title：Ultrasonics

authors： Luo EC,Ling H,Dai W,Yu GY

更新日期：2006-12-22 00:00:00

abstract：:Cones and wedges inserted between an ultrasonic transducer and the specimen provide the transducer (circular or rectangular shape) with enhanced capability for point or line contact with the specimen. Such an arrangement is useful in that the transducer can be used for transmitting to and receiving from a point (or li...

journal_title：Ultrasonics

authors： Rus G,Wooh SC,Gallego R

更新日期：2005-03-01 00:00:00

abstract：:Single clouds of cavitation bubbles, driven by 254kHz focused ultrasound at pressure amplitudes in the range of 0.48-1.22MPa, have been observed via high-speed shadowgraphic imaging at 1×10(6) frames per second. Clouds underwent repetitive growth, oscillation and collapse (GOC) cycles, with shock-waves emitted periodi...

journal_title：Ultrasonics

authors： Johnston K,Tapia-Siles C,Gerold B,Postema M,Cochran S,Cuschieri A,Prentice P

更新日期：2014-12-01 00:00:00

abstract：:During the last decade, the introduction of ultrasound techniques in arc welding with the intention of improving the operational performance and technical characteristics of the welding processes have been studied intensively. In this work is presented a broad review of the literature surrounding the utilization of th...

journal_title：Ultrasonics

authors： da Cunha TV,Bohórquez CE

更新日期：2015-02-01 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：:Thallium bromide iodide crystal also known as KRS-5 is the well known material used in far infrared radiation applications for optical windows and lenses fabrication. The main advantage of this material is the transparency in wide band of wavelengths from 0.53 to 50μm. Despite such advantages as transparency and large...

journal_title：Ultrasonics

authors： Mantsevich SN

更新日期：2017-03-01 00:00:00

abstract：:Very little is known about the myometrium's physiology in terms of its elasticity but shear wave elastography could be an efficient tool to better understand it. This could considerably help the prevention of difficult births, the consequences of which are tremendous for neonate morbidity and pathologies. The purpose ...

journal_title：Ultrasonics

authors： Gennisson JL,Muller M,Gabor P,Frydman R,Musset D,Tanter M,Ami O

更新日期：2015-02-01 00:00:00

abstract：:The focus of contrast-enhanced ultrasound research has developed beyond visualizing the blood pool and its flow to new areas such as perfusion imaging, drug and gene therapy, and targeted imaging. In this work comparison between the application of polymer- and phospholipid-shelled ultrasound contrast agents (UCAs) for...

journal_title：Ultrasonics

authors： Grishenkov D,Kari L,Brodin LK,Brismar TB,Paradossi G

更新日期：2011-01-01 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：:Diversity of acoustic streaming field in a 2D rectangular chamber with a traveling wave and using water as the acoustic medium is numerically investigated by the finite element method. It is found that the working frequency, the vibration excitation source length, and the distance and phase difference between two sepa...

journal_title：Ultrasonics

authors： Tang Q,Hu J

更新日期：2015-04-01 00:00:00

abstract：:This paper reports the development of a two-dimensional thick film lead zirconate titanate (PZT) ultrasonic transducer array, operating at frequency approximately 7.5MHz, to demonstrate the potential of this fabrication technique for microparticle manipulation. All layers of the array are screen-printed then sintered ...

journal_title：Ultrasonics

authors： Qiu Y,Wang H,Gebhardt S,Bolhovitins A,Démoré CE,Schönecker A,Cochran S

更新日期：2015-09-01 00:00:00

abstract：:In this paper, an optimization method aimed at designing aperiodic linear sparse arrays is proposed that is based on the stochastic optimization methodology called simulated annealing. Such a method optimizes the positions and the weight coefficients of each element of a linear array in order to obtain a beam pattern ...

journal_title：Ultrasonics

authors： Trucco A

更新日期：2000-03-01 00:00:00

abstract：:The accuracy of measuring inclusion size in direct C-scan image of immersion ultrasonic testing is restricted by the lateral resolution of the focused transducer, even if a high frequency is used, and the blurred edge due to scattering of sound waves at inclusions. In this work, an improved image restoration method th...

journal_title：Ultrasonics

authors： Chen D,Xiao H,Xu J

更新日期：2019-01-01 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：:A method is proposed to measure the stress on a tightened bolt using an electromagnetic acoustic transducer (EMAT). A shear wave is generated by the EMAT, and a longitudinal wave is obtained from the reflection of the shear wave due to the mode conversion. The ray paths of the longitudinal and the shear wave are analy...

journal_title：Ultrasonics

authors： Ding X,Wu X,Wang Y

更新日期：2014-03-01 00:00:00

abstract：:Reflections of 4 MHz ultrasound pulses from 60 sites on 15 human aorta specimens were analysed using the plane-wave Born approximation (PWBA) inverse scattering method. The recovered high-resolution acoustic impedance profile for each site was correlated with an analysis (by microscope) of sections taken from that sit...

journal_title：Ultrasonics

authors： Tobocman W,Santosh K,Carter JR,Haacke EM

更新日期：1995-07-01 00:00:00

abstract：:Steel-concrete modular construction is increasingly used in nuclear structure construction. Conventional nondestructive testing methods are not able to detect internal concrete defects because the thick concrete wall is covered by steel plates. An ultrasonic guided method is proposed to detect honeycombs and voids aro...

journal_title：Ultrasonics

authors： Sun H,Zhu J

更新日期：2020-04-01 00:00:00

abstract：OBJECTIVES:This paper aims to apply median filters for reducing interpolation error and improving the quality of 3D images in a freehand 3D ultrasound (US) system. BACKGROUND AND MOTIVATION:Freehand 3D US imaging has been playing an important role in obtaining the entire 3D impression of tissues and organs. Reconstruc...

journal_title：Ultrasonics

authors： Huang QH,Zheng YP

更新日期：2008-07-01 00:00:00

abstract：:In this paper, we investigated theoretically and experimentally the effect of the conductivity of the film located in the immediate vicinity of the free side of a piezoelectric resonator based on the PZT ceramics on its characteristics. It is shown that with increasing the conductivity of the film at first the paralle...

journal_title：Ultrasonics

authors： Zaitsev BD,Semyonov AP,Teplykh AA,Borodina IA

更新日期：2019-04-01 00:00:00

abstract：:State-of-the-art integrally stiffened composite materials, manufactured for use in the next generation of commercial and military aircraft, are increasingly being used for structural components such as wings and fuselages. However, the complexity of the manufacturing processes can produce small variations in the shape...

journal_title：Ultrasonics

authors： McKie AD,Addison RC Jr

更新日期：2002-12-01 00:00:00

abstract：:We report on the 3-D modelling of periodic arrays of capacitive micromachined ultrasonic transducers (cMUTs) operating in fluid. Specific developments have been performed to model biperiodic transducer arrays and to take into account radiation into any stratified media at the front-side as well as the back-side of the...

journal_title：Ultrasonics

authors： Wilm M,Reinhardt A,Laude V,Armati R,Daniau W,Ballandras S

更新日期：2005-05-01 00:00:00

abstract：:The method of wave function expansion is adopted to study the three dimensional scattering of a time-harmonic plane progressive sound field obliquely incident upon a multi-layered hollow cylinder with interlaminar bonding imperfection. For the generality of solution, each layer is assumed to be cylindrically orthotrop...

journal_title：Ultrasonics

authors： Rajabi M,Hasheminejad SM

更新日期：2009-12-01 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

abstract：:Experimentally observed dissipated nonlinearity in Lamb wave propagation in composites due to stress-relaxation is reported herein. It was found that the stress relaxation in composite is inherently coupled with the second order nonlinear parameter derived from the Lamb wave modes. Due to the combined effect of intern...

journal_title：Ultrasonics

authors： Patra S,Ahmed H,Saadatzi M,Banerjee S

更新日期：2019-07-01 00:00:00

abstract：:The present paper studies experimentally and numerically the surface acoustic wave (SAW) field on a piezoelectric substrate generated by interdigital transducers (IDT). On the one hand, mechanical displacements produced by the SAW are measured with the help of a laser Doppler vibrometer. On the other hand, mechanical ...

journal_title：Ultrasonics

authors： Weser R,Darinskii AN,Weihnacht M,Schmidt H

更新日期：2020-08-01 00:00:00

abstract：:Surface acoustic wave (SAW) waveguide resonator is formed by a ring-shaped strip of copper 10 microm wide and approximately 130 microm in diameter embedded into a 0.8 microm thick layer of silica on a silicon wafer. SAWs are excited at one side of the copper ring by a short laser pulse focused into a spatially periodi...

journal_title：Ultrasonics

authors： Maznev AA

更新日期：2009-01-01 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

authors： Elkateb Hachemi M,Callé S,Remenieras JP

更新日期：2006-12-22 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

authors： Yang CH,Tsai YC

更新日期：2006-12-22 00:00:00