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Numrical Simulation of Nonlinear Focused Ultrasound
2019 14th Symposium on Piezoelectrcity, Acoustic Waves and Device Applications (SPAWDA), 2019Numerical simulation is employed to characterize the sound field of high intensity focused ultrasound, whose results agree well with the analytical results. The sound field in nonlinear case seems to be much more complicated compared with that in linear case.
De-lin WU +6 more
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Beam-forming for nonlinear ultrasound inversion
jiip, 2002Abstract - Common models in ultrasound inversion are based on the assumption that the inspected tissue consists of point scatterers and the spatial responses of the single point scatterers do not interfere. These models offer an efficient way to recover reflection coefficients of point scatterers.
Kowar, R., Scherzer, O.
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Nonlinear Propagation of Ultrasound in Liquid Media
1983It is well known that acoustic phenomena are fundamentally nonlinear, though a large class of acoustical phenomena can be dealt with by linearizing the equations of motion leading to acceptable and usable solutions(1,2). This is, of course, very convenient as the nonlinear relations are extremely difficult to deal with.
F. Dunn, W. K. Law, L. A. Frizzell
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Nonlinear resonant ultrasound for damage detection
AIP Conference Proceedings, 2000Nonlinear resonance measurements provide the means to make very precise determination of material properties (e.g., modulus) as well as to ascertain damage. Nonlinear resonance measurements made on concrete cores show many similarities to measurements made on earth materials. Resonance peak shifts and memory effects can both be used to ascertain damage.
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The Effects Of Nonlinear Propagation In Ultrasound Hyperthermia
[1990] Proceedings of the Twelfth Annual International Conference of the IEEE Engineering in Medicine and Biology Society, 2005In this study the feasibility of utilizing nonlinear ultrasound propagation to control the power deposition patterns during scanned focussed ultrasound was investigated. From the in vivo results it appears that the power depm pattern and the temperature distributions can be significantly altered by increasing the source intensity while reducing the ...
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On the Nonlinear Theory of Ultrasound Amplification in Semiconductors
IEEE Transactions on Sonics and Ultrasonics, 1970The nonlinear theory of the amplification of ultrasonic waves of arbitrary amplitude by the electric current in semiconductors is developed in the arproxirnation of small variations of amplitude, shape, and velocity of the wave on the wavelength in space and during the period of oscillation in time.
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Nonlinear acoustics of phase conjugate ultrasound waves
2010In this presentation, the principles of nonlinear acoustics of phase conjugate ultrasound waves (PCW) and their applications for nonlinear imaging and flow diagnostics are reviewed. The theoretical basis for description of nonlinear propagation of PCW in inhomogeneous and moving media is presented.
Preobrazhensky, Vladimir +1 more
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Research on non-collinear mixing test method of concrete nonlinear ultrasound
Nondestructive Testing and Evaluation, 2022Zhichao Nie, Kui Wang, Jianfeng Liu
exaly
Nonlinear propagation of ultrasound in microbubble populations
Αυτή η διατριβή περιγράφει την ανάπτυξη μιας αριθμητικής μεθόδου ικανής να μοντελοποιήσει τη μη γραμμική διάδοση των κυμάτων υπερήχων μέσω ενός πληθυσμού σκεδαστών, λαμβάνοντας υπόψη διάφορα φυσικά φαινόμενα. Βασίζεται στην υπάρχουσα μέθοδο Iterative Nonlinear Contrast Soucre (INCS).openaire +1 more source
Nonlinear Behavior of High-Intensity Ultrasound Propagation in an Ideal Fluid
Acoustics, 2020Jitendra Kewalramani +2 more
exaly