Dynamic ultrasound radiation force in fluids

Silva, Glauber T.; Chen, Shigao; Greenleaf, James F.; Fatemi, Mostafa

doi:10.1103/physreve.71.056617

Cited by 54 publications

(56 citation statements)

References 33 publications

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“…The radiation force exerted on an object by a continuous-wave surface acoustic wave can be obtained by solving the vector surface integral of the radiation-stress tensor (defined as the time average of the wave momentum flux) over a surface enclosing the object 35 . Within the second-order approximation, the acoustic radiation force can be governed by 35,43 …”

Section: Methodsmentioning

confidence: 99%

Generation of acoustic self-bending and bottle beams by phase engineering

et al. 2014

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Directing acoustic waves along curved paths is critical for applications such as ultrasound imaging, surgery and acoustic cloaking. Metamaterials can direct waves by spatially varying the material properties through which the wave propagates. However, this approach is not always feasible, particularly for acoustic applications. Here we demonstrate the generation of acoustic bottle beams in homogeneous space without using metamaterials. Instead, the sound energy flows through a three-dimensional curved shell in air leaving a close-to-zero pressure region in the middle, exhibiting the capability of circumventing obstacles. By designing the initial phase, we develop a general recipe for creating self-bending wave packets, which can set acoustic beams propagating along arbitrary prescribed convex trajectories. The measured acoustic pulling force experienced by a rigid ball placed inside such a beam confirms the pressure field of the bottle. The demonstrated acoustic bottle and self-bending beams have potential applications in medical ultrasound imaging, therapeutic ultrasound, as well as acoustic levitations and isolations.

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Section: Methodsmentioning

confidence: 99%

Generation of acoustic self-bending and bottle beams by phase engineering

et al. 2014

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“…Such a complete theory, as presented here, is necessary to investigate the conditions under which an object's difference frequency response may be detectable and when each of the various second order mechanisms may dominate. To treat the case of a movable object, we define a complete and self-consistent second order acoustic wave-exciting force, and find previous helpful formulations [28,[45][46][47] missed the effects of some second order field components and overcounted others. (An analytic solution for the SS field arising from a rigid immovable sphere was dervied by Silva and Bandeira [48].)…”

Section: Discussionmentioning

confidence: 99%

Active Nonlinear Acoustic Sensing of an Object with Sum or Difference Frequency Fields

et al. 2017

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A number of nonlinear acoustic sensing methods exist or are being developed for diverse areas ranging from oceanic sensing of ecosystems, gas bubbles, and submerged objects to medical sensing of the human body. Our approach is to use primary frequency incident waves to generate second order nonlinear sum or difference frequency fields that carry information about an object to be sensed. Here we show that in general nonlinear sensing of an object, many complicated and potentially unexpected mechanisms can lead to sum or difference frequency fields. Some may contain desired information about the object, others may not, even when the intention is simply to probe an object by linear scattering of sum and difference frequency incident waves generated by a parametric array. Practical examples illustrating this in ocean, medical, air and solid earth sensing are given. To demonstrate this, a general and complete second-order theory of nonlinear acoustics in the presence of an object is derived and shown to be consistent with experimental measurements. The total second-order field occurs at sum or difference frequencies of the primary fields and naturally breaks into (A) nonlinear waves generated by wave-wave interactions, and (B) second order waves from scattering of incident wave-wave fields, boundary advection, and wave-force-induced centroidal motion. Wave-wave interactions are analytically shown to always dominate the total second-order field at sufficiently large range and carry only primary frequency response information about the object. As range decreases, the dominant mechanism is shown to vary with object size, object composition, and frequencies making it possible for sum or difference frequency response information about the object to be measured from second-order fields in many practical scenarios. It is also shown by analytic proof that there is no scattering of sound by sound outside the region of compact support intersection of finite-duration plane waves at sum or difference frequencies, to second-order. Analytic expressions for second-order fields due to combinations of planar and far-field wave-wave interactions are also derived as are conditions for when wave-wave interactions will dominate the second order field.

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“…The inverse transform is represented by F −1 . The dynamic radiation force exerted by a bichromatic wave on an object is given by [18] …”

Section: Theory Of Dynamic Radiation Forcementioning

confidence: 99%

Dynamic radiation force of acoustic waves on solid elastic spheres

Silva

2006

The Journal of the Acoustical Society of America

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The present study concerns the dynamic radiation force on solid elastic spheres exerted by a plane wave with two frequencies (bichromatic wave) considering the nonlinearity of the fluid. Our approach is based on solving the wave scattering for the sphere in the quasilinear approximation within the preshock wave range. The dynamic radiation force is then obtained by integrating the component of the momentum flux tensor at the difference of the primary frequencies over the boundary of the sphere. Results reveal that effects of the nonlinearity of the fluid plays a major role in dynamic radiation force leading it to a parametric amplification regime. The developed theory is used to calculate the dynamic radiation force on three different solid spheres (aluminium, silver, and tungsten). Resonances are observed in the spectrum of the force on the spheres. They have larger amplitude and better shape than resonances present in static radiation force.

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Dynamic ultrasound radiation force in fluids

Cited by 54 publications

References 33 publications

Generation of acoustic self-bending and bottle beams by phase engineering

Generation of acoustic self-bending and bottle beams by phase engineering

Active Nonlinear Acoustic Sensing of an Object with Sum or Difference Frequency Fields

Dynamic radiation force of acoustic waves on solid elastic spheres

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