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Espinosa, VAuthorSánchez-Morcillo, VjAuthorCruañes, JAuthorCamarena, FAuthor
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Proceedings Paper

The strong effects of on-axis focal shift and its nonlinear variation in ultrasound beams radiated by low Fresnel number transducers

Publicated to:Aip Conference Proceedings. 838 237-+ - 2006-01-01 838(), DOI: 10.1063/1.2210353

Authors: Makov, Y N; Espinosa, V; Sanchez-Morcillo, V J; Ramis, J; Cruanes, J; Camarena, F

Affiliations

Moscow MV Lomonosov State Univ, Fac Phys, Dept Acoust - Author
Univ Politecn Valencia, Escola Politecn Gandia, Dept Fis Aplicada - Author

Abstract

On the basis of theoretical concepts, an accurate and complete experimental and numerical examination of the on-axis distribution and the corresponding temporal profiles for low-Fresnel-number focused ultrasound beams under increasing transducer input voltage has been performed. For a real focusing transducer with sufficiently small Fresnel number, a strong initial (linear) shift of the main on-axis pressure maximum from geometrical focal point towards the transducer, and its following displacement towards the focal point and backward motion as the driving transducer voltage increase until highly nonlinear regimes were fixed. The simultaneous monitoring of the temporal waveform modifications determines the real roles and interplay between different nonlinear effects (refraction and attenuation) in the observed dynamics of on-axis pressure maximum The experimental results are in good agreement with numerical solutions of KZK equation, confirming that the observed dynamic shift of the maximum pressure point is related only to the interplay between diffraction, dissipation and nonlinearity of the acoustic wave.

Keywords
Fresnel numberHigh power focused ultrasoundNonlinear absorptionSound beams

Quality index

Bibliometric impact. Analysis of the contribution and dissemination channel

The work has been published in the journal Aip Conference Proceedings, Q4 Agency Scopus (SJR), its regional focus and specialization in Physics and Astronomy (Miscellaneous), give it significant recognition in a specific niche of scientific knowledge at an international level.

Impact and social visibility

From the perspective of influence or social adoption, and based on metrics associated with mentions and interactions provided by agencies specializing in calculating the so-called "Alternative or Social Metrics," we can highlight as of 2025-05-03:

  • The use of this contribution in bookmarks, code forks, additions to favorite lists for recurrent reading, as well as general views, indicates that someone is using the publication as a basis for their current work. This may be a notable indicator of future more formal and academic citations. This claim is supported by the result of the "Capture" indicator, which yields a total of: 2 (PlumX).
Leadership analysis of institutional authors

This work has been carried out with international collaboration, specifically with researchers from: Russia.

There is a significant leadership presence as some of the institution’s authors appear as the first or last signer, detailed as follows: Last Author (Camarena Femenia, Francisco).