Determination of Ultrasonic Waves’ Propagation Angles for the Numerical Reconstruction of Thermite Welding Rail's Defects

The algorithms based on Synthetic Aperture Focusing Technique are aimed at the determination of the imageries of the flaws in controlled objects. Ultrasonic imaging of complex-shaped objects requires specific algorithms which are able to take into account the complicated character of ultrasonic waves propagation. In this article, we suggested the novel frequency-domain algorithm for ultrasonic imaging of complex-shaped objects. This algorithm is based on Phase –shift migration theory and Stolt transform. The evaluation of suggested technique was done by the application of raw ultrasonic data which was obtained by using computer simulations. Derived results show that proposed algorithm is able to make accurate and precise imaging of flaws in complex-shaped objects.

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Simulation and Experimental Measurement of Ultrasonic Waves Propagation Velocity in Trabecular Bone

Advanced Materials Research ◽

10.4028/www.scientific.net/amr.418-420.765 ◽

2011 ◽

Vol 418-420 ◽

pp. 765-771

Author(s):

Abderrazek Bennamane ◽

Tarek Boutkedjirt

Keyword(s):

Porous Media ◽

Trabecular Bone ◽

Interstitial Fluid ◽

Ultrasonic Waves ◽

Longitudinal Waves ◽

Fluid Saturation ◽

Waves Propagation ◽

Propagation Velocities ◽

Rigid Skeleton

The influence of porosity on ultrasonic waves propagation in porous media, specifically in the bone tissue is examined in this work. The tissue is considered as a complex medium (anisotropic and heterogeneous) made of a rigid skeleton, filled by a medium which is supposed to be fluid. The theory of Biot is well suitable to describe the behavior of the ultrasonic waves in this tissue. The aim of this work is to determine how porosity affects propagation velocities of the various waves susceptible to propagate through the cortical or trabecular bone. By reference to this model and taking account of the viscous dissipation of the interstitial fluid, various propagation velocities were determined. A range of porosity extending from 0 to 1 and two types of fluid saturation (water and marrow) was considered. The results obtained show the influence of porosity on the propagation velocities of the longitudinal waves (the slow and the fast one) as well as of the transverse wave. Porosity and the nature of the interstitial fluid affect the dissipation phenomenon. According to the model suggested in this study and to the experimental results obtained, it can be affirmed that the determination of various propagation velocities in the bone leads to its characterization and can inform us about its pathological status.

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Determination of the foaming parameters of polyurethane compositions from the velocity of longitudinal ultrasonic waves

Mechanics of Composite Materials ◽

10.1007/bf00624000 ◽

1979 ◽

Vol 15 (3) ◽

pp. 316-317 ◽

Cited By ~ 1

Author(s):

V. M. Mel'nikov ◽

�. A. Putnin'sh ◽

V. O. Putninya ◽

V. P. Karlivan

Keyword(s):

Ultrasonic Waves ◽

Longitudinal Ultrasonic Waves

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DETERMINATION OF DINAMIC MODULES OF ELASTIC OF POLYMER AUXETICS WITH THE HELP OF PULSE IMMERSION MEASUREMENTS OF PROPAGETION VELOSITIES OF ULTRASONIC WAVES

Key title Zbìrnik naukovih pracʹ Odesʹkoï deržavnoï akademìï tehnìčnogo regulûvannâ ta âkostì ◽

10.32684/2412-5288-2019-1-14-13-18 ◽

2019 ◽

Vol - (1(14)) ◽

pp. 13-18

Author(s):

V. А. Mashchenko ◽

◽

V. P. Kvasnikov ◽

N. А. Borduk ◽

T. N. Shevchuk ◽

...

Keyword(s):

Ultrasonic Waves

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Age-Dependent Acoustic and Microelastic Properties of Red Blood Cells Determined by Vector Contrast Acoustic Microscopy

Microscopy and Microanalysis ◽

10.1017/s143192761200030x ◽

2012 ◽

Vol 18 (3) ◽

pp. 436-444 ◽

Cited By ~ 7

Author(s):

Esam T. Ahmed Mohamed ◽

Albert E. Kamanyi ◽

Mieczysław Pluta ◽

Wolfgang Grill

Keyword(s):

Red Blood Cells ◽

Blood Cells ◽

Mass Density ◽

Healthy Person ◽

Ultrasonic Waves ◽

Acoustic Microscopy ◽

Cell Parameters ◽

Different Ages ◽

The Individual

AbstractVariations of the mechanical properties of red blood cells that occur during their life span have long been an intriguing task for investigations. The research presented is based on noninvasive monitoring of red blood cells of different ages performed by scanning acoustic microscopy with magnitude and phase contrast. The characteristic signature of fixed cells from groups of three different ages fractionated according to mass density is obtained from the acoustic microscope images, with the data represented in polar graphs. The analysis of these data enables the determination of averaged values for the velocities of ultrasound propagating in the cells from the different groups ranging from (1,681 ± 16) m s−1in the youngest to (1,986 ± 20) m s−1in the oldest group. The determined bulk modulus varies with age from (3.04 ± 0.05) GPa to (4.34 ± 0.08) GPa. An approach to determine for an age-mixed population of red blood cells, collected from a healthy person, the age of the individual cells and the age dependence of the cell parameters including density, velocity, and attenuation of longitudinal polarized ultrasonic waves traveling in the cells is demonstrated.

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Determination of the thermal expansion coefficient of a lithium single crystal by using ultrasonic waves

Physics Letters ◽

10.1016/0031-9163(65)90378-1 ◽

1965 ◽

Vol 16 (1) ◽

pp. 17-18 ◽

Cited By ~ 4

Author(s):

E. Mäntysalo

Keyword(s):

Thermal Expansion ◽

Single Crystal ◽

Thermal Expansion Coefficient ◽

Expansion Coefficient ◽

Ultrasonic Waves

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An optodynamic determination of the depth of laser-drilled holes by the simultaneous detection of ultrasonic waves in the air and in the workpiece

Ultrasonics ◽

10.1016/s0041-624x(02)00211-1 ◽

2002 ◽

Vol 40 (1-8) ◽

pp. 791-795 ◽

Cited By ~ 19

Author(s):

Simon Strgar ◽

Janez Možina

Keyword(s):

Simultaneous Detection ◽

Ultrasonic Waves

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Ultrasonic attenuation in lead

Proceedings of the Royal Society of London Series A - Mathematical and Physical Sciences ◽

10.1098/rspa.1963.0006 ◽

1963 ◽

Vol 271 (1344) ◽

pp. 88-104 ◽

Cited By ~ 10

Keyword(s):

Magnetic Field ◽

Ultrasonic Attenuation ◽

Absolute Magnitude ◽

Transverse Magnetic ◽

Ultrasonic Waves ◽

Acoustic Oscillations ◽

Connected Surface ◽

Sample Orientation ◽

Longitudinal Ultrasonic Waves

The absorption of longitudinal ultrasonic waves has been studied as a function of transverse magnetic field in pure single crystals of lead at 1.2 °K. The results were found to be generally consistent with the Fermi surface of lead suggested by Gold. In particular a detailed study of the magneto-acoustic oscillations, as a function of sample orientation and field direction, allowed the determination of some of the dimensions of the hole surface in the second Brillouin zone and revealed a number of new electronic orbits on the multiply-connected surface in the third zone. The absolute magnitude of the attenuation and its dependence on propagation direction and on magnetic field was studied and the results interpreted in terms of the general theory of ultrasonic absorption.

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