Waveguides in medical ultrasonics: an experimental study of mode propagation.

abstract：:Interference noising originating from the ultrasonic testing defect signal seriously influences the accuracy of the signal extraction and defect location. Time-frequency analysis methods are mainly used to improve the defects detection resolution. In fact, the S-transform, a hybrid of the Short time Fourier transform ...

journal_title：Ultrasonics

authors： Benammar A,Drai R,Guessoum A

更新日期：2014-02-01 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：: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

authors： Le Clezio E,Predoi MV,Castaings M,Hosten B,Rousseau M

更新日期：2003-01-01 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

authors： Shilo D,Zolotoyabko E

更新日期：2002-05-01 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

authors： Kurosawa MK

更新日期：2000-03-01 00:00:00

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

authors： Lomonosov AM,Hess P

更新日期：2008-11-01 00:00:00

abstract：:Machining temperature is a key factor in ultrasonic vibration-assisted milling as it can significantly influence tool wear rate and residual thermal stresses. In current study, a physics-based analytical predictive model on machining temperature in ultrasonic vibration-assisted milling is proposed, without resorting t...

journal_title：Ultrasonics

authors： Feng Y,Hsu FC,Lu YT,Lin YF,Lin CT,Lin CF,Lu YC,Liang SY

更新日期：2020-12-01 00:00:00

abstract：:Most methods used to measure the thickness of thin liquid or solid surface films and coatings need access to the coated surface. In this work reflected ultrasonic pulses were used to measure a coating thickness from a solid back face. Piezoelectric transducers on the solid back face emitted ultrasound waves and receiv...

journal_title：Ultrasonics

authors： Kanja J,Mills R,Li X,Brunskill H,Hunter AK,Dwyer-Joyce RS

更新日期：2021-02-01 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

authors： Lee JW,Ohm WS,Kim YT

更新日期：2017-11-01 00:00:00

abstract：:Current medical ultrasonic scanning instrumentation permits the display of fine image detail (speckle) which does not transfer useful information but degrades the apparent low contrast resolution in the image. An adaptive two-dimensional filter has been developed which uses local features of image texture to recognize...

journal_title：Ultrasonics

authors： Bamber JC,Daft C

更新日期：1986-01-01 00:00:00

abstract：:In order to guide the needle to the correct location in 3D US-guided brachytherapy, the needle is continuously tracked as it is being inserted. A pre-scan before the needle insertion and a post-scan after the needle insertion are subtracted to obtain a difference image containing the needle. The image is projected alo...

journal_title：Ultrasonics

authors： Ding M,Wei Z,Gardi L,Downey DB,Fenster A

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

authors： Hasegawa M,Takata M,Matsumura J,Oda K

更新日期：2011-04-01 00:00:00

abstract：:Human umbilical cords were exposed to high amplitude focussed ultrasonic pulses with focal energy densities 0.6 and 0.4 mJ mm-2. The endothelium of the exposed vessel (vein) was examined by means of confocal laser scanning microscopy and scanning electron microscopy. The degree of tissue change ranged from the inducti...

journal_title：Ultrasonics

authors： Seidl M,Steinbach P,Wörle K,Hofstädter F

更新日期：1994-09-01 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：: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

authors： Yang X,Wang K,Xu Y,Xu L,Hu W,Wang H,Su Z

更新日期：2020-12-01 00:00:00

abstract：:This paper presents the experimental study of a miniaturized surface acoustic waves (SAWs) rotary motor and the theoretical calculation. After the first success in SAW rotary motor operating at 9.85 MHz, a smaller rotary motor is designed. With the operating frequency of 30 MHz and the driving voltage of 120 V(p-p), t...

journal_title：Ultrasonics

authors： Cheng LP,Zhang GM,Zhang SY,Yu J,Shui XJ

更新日期：2002-06-01 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

authors： Yang CH,Tsai YC

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

authors： Melodelima D,Prat F,Birer A,Theillère Y,Cathignol D

更新日期：2004-04-01 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：:Experimental and theoretical studies on degradation of composite-epoxy adhesive joints were carried out on samples having different interfacial and cohesive properties. Oblique incidence ultrasonic inspection of bonded joints revealed that degradation in the adhesive can be measured by significant variation in reflect...

journal_title：Ultrasonics

authors： Vijaya Kumar RL,Bhat MR,Murthy CR

更新日期：2013-08-01 00:00:00

abstract：:The objective of this paper is to present recent investigations in characteristics of the sound field generated by neurosurgical endoscopic ultrasonic probes (NEUPs) for minimally invasive surgery. The importance of this information has been investigated and discussed taking into account following facts: 1. According ...

journal_title：Ultrasonics

authors： Stimac A,Ivancević B,Jambrosić K

更新日期：2002-05-01 00:00:00

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 main challenge faced by 3D ultrasonic imaging with 2D array transducers is the large number of elements required to achieve an acceptable level of quality in the images. Therefore, the optimisation of the array layout, in order to reduce the number of active elements in the aperture, has been a research topic in t...

journal_title：Ultrasonics

authors： Martínez-Graullera O,Martín CJ,Godoy G,Ullate LG

更新日期：2010-02-01 00:00:00

abstract：:Ultrasonic standing wave chambers with acoustic pathlengths of 1.1 and 0.62 mm have been constructed. The chambers were driven at frequencies over the range 0.66-12.2 MHz. The behaviour of 2 microns diameter latex microparticles and 5 microns diameter yeast in the chambers has been elucidated. One (flow) chamber had a...

journal_title：Ultrasonics

authors： Hawkes JJ,Barrow D,Coakley WT

更新日期：1998-08-01 00:00:00

abstract：:An ultrasonic technique for imaging nonlinear scatterers, such as partially-closed cracks, buried in a medium has been recently proposed. The method called fundamental wave amplitude difference (FAD) consists of a sequence of acquisitions with different subsets of elements for each line of the image. An image revealin...

journal_title：Ultrasonics

authors： Haupert S,Ohara Y,Carcreff E,Renaud G

更新日期：2019-07-01 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

authors： Derbesse L,Pernod P,Latard V V,Merlen A,Decultot D,Touraine N,Maze G

更新日期：2000-03-01 00:00:00

abstract：:The purpose of this study is to gain the knowledge and experience in the design of thin-disk piezoceramic-driving ultrasonic actuator dedicated. In this paper, the design and construction of an innovative ultrasonic actuator is developed as a stator, which is a composite structure consisting of piezoceramic (PZT) memb...

journal_title：Ultrasonics

authors： Wen FL,Yen CY,Ouyang M

更新日期：2003-08-01 00:00:00

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

authors： Mao Q,Coutris N,Rack H,Fadel G,Gibert J

更新日期：2020-03-01 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：:Guided modes propagation in intact, fractured and healing long bone has drawn significant research interests. However, mode quantifications for the direct comparison are still necessary to address. The aim of the study is to analyze the mode interaction with a notch-fracture in the long bone and find quantitative ultr...

journal_title：Ultrasonics

authors： Xu K,Liu D,Ta D,Hu B,Wang W

更新日期：2014-07-01 00:00:00