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Listar por palabra clave "Nonlinear acoustics"

Mostrando ítems 1-9 de 9

Dynamic nonlinear focal shift in amplitude modulated moderately focused acoustic beams

Jimenez, Noe; Camarena Femenia, Francisco; González-Salido, Nuria (Elsevier, 2017-03)

[EN] The phenomenon of the displacement of the position of the pressure, intensity and acoustic radiation force maxima along the axis of focused acoustic beams under increasing driving amplitudes (nonlinear focal shift) ...
Efficiency of parametric ultrasound generation in relaxing media for very shallow-water echo sounders

Ordoñez-Cebrian, Patricia; Jimenez, Noe; Espinosa Roselló, Víctor; Puig Pons, Vicente; Soliveres, Ester (2014-04)

Parametric acoustic generation provides the possibility to obtain narrow and nearly side-lobe free acoustic beams for low frequencies. In this way, the nonlinear interaction of two intense beams with close frequencies ...
Nonlinear focal shift beyond the geometrical focus in moderately focused acoustic beams

Camarena Femenia, Francisco; Adrián Martínez, Silvia; Jimenez, Noe; Sánchez Morcillo, Víctor José (Acoustical Society of America, 2013-08)

The phenomenon of the displacement of the position along the axis of the pressure, intensity, and radiation force maxima of focused acoustic beams under increasing driving voltages (nonlinear focal shift) is studied for ...
Nonlinear focusing of ultrasonic waves by an axisymmetric diffraction grating embedded in water

Jimenez, Noe; Romero García, Vicente; Picó Vila, Rubén; García-Raffi, L. M.; Staliünas, Kestutis (American Institute of Physics (AIP), 2015-11-16)

We report the nonlinear focusing of ultrasonic waves by an axisymmetric diffraction grating immersed in water. In the linear regime, the system presents high focal gain (32 dB), with a narrow beam-width and intense side ...
Nonlinear ultrasound simulations including complex frequency dependent attenuation

Jimenez, Noe; Redondo, Javier; Sánchez Morcillo, Víctor José; Camarena Femenia, Francisco (Elsevier, 2015)

[EN] Including non-squared frequency dependent attenuation is essential to obtain accurate acoustic predictions in biological media when wide-band signals and/or nonlinear effects are taken into account. Thus, a time ...
On the nonlinear effects in focused ultrasound beams with frequency power law attenuation

Jimenez, Noe; Redondo, Javier; Sánchez Morcillo, Víctor José; Iglesias, Pablo C.; Camarena Femenia, Francisco (Elsevier, 2015)

[EN] When finite amplitude ultrasound propagation is considered, changes in spatial features of focused ultrasound beams can be observed. These nonlinear effects typically appear in thermoviscous fluids as focal displacements, ...
Simultaneous self-collimation of fundamental and second-harmonic in sonic crystals

Soliveres, Ester; Pérez Arjona, Isabel; Picó Vila, Rubén; Espinosa Roselló, Víctor; Sánchez Morcillo, Víctor José; Staliunas, K. (American Institute of Physics (AIP), 2011-10)

Simultaneous self-collimation of sound beams with different frequencies, corresponding to fundamental wave and to its second harmonic, is proposed theoretically and demonstrated experimentally. The result is obtained when ...
Sub-Diffractive Acoustic Vortices by Nonlinear Mixing

Jimenez, Noe; Ealo, Joao; Muelas-Hurtado, Rubén; Duclos, Aroune; Romero-García, Vicent (IEEE, 2021-09-16)

[EN] Vortex beams, characterized by a collimated wavefront with a phase dislocation at their principal axis, have found practical applications to construct acoustic tweezers for particle trapping and manipulation, or ...
Sub-wavelength acoustical vortex beams using self-demodulation

Jimenez, Noe; Ealo, Joao; Muelas-Hurtado, Rubén D.; Duclos, Aroune; Romero-García, Vicent (American Physical Society, 2021-05-13)

[EN] Acoustic vortices with subwavelength dimensions and tunable topological charge are theoretically and experimentally synthesized at distances far beyond the Rayleigh diffraction length of the source, using self-demodulation. ...