| Texto completo | |
| Autor(es): |
Prego-Borges, Jose L.
[1]
;
Zamboni-Rached, Michel
[1]
;
Recami, Erasmo
[2, 3, 1]
;
Hernandez-Figueroa, Hugo E.
[1]
Número total de Autores: 4
|
| Afiliação do(s) autor(es): | [1] Univ Estadual Campinas, Fac Elect Engn, Campinas, SP - Brazil
[2] INFN Sez Milano, Milan - Italy
[3] Bergamo State Univ, Fac Engn, Bergamo - Italy
Número total de Afiliações: 3
|
| Tipo de documento: | Artigo Científico |
| Fonte: | IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL; v. 60, n. 11, p. 2414-2425, NOV 2013. |
| Citações Web of Science: | 6 |
| Resumo | |
In this paper, we show how appropriate super-positions of Bessel beams can be successfully used to obtain arbitrary longitudinal intensity patterns of nondiffracting ultrasonic wave fields with very high transverse localization. More precisely, the method here described allows generation of longitudinal acoustic pressure fields whose longitudinal intensity patterns can assume, in principle, any desired shape within a freely chosen interval 0 <= z <= L of the propagation axis, and that can be endowed in particular with a static envelope (within which only the carrier wave propagates). Indeed, it is here demonstrated by computer evaluations that these very special beams of nonattenuated ultrasonic field can be generated in water-like media by means of annular transducers. Such fields at rest have been called by us acoustic frozen waves (FWs). The paper presents various cases of FWs in water, and investigates their aperture characteristics, such as minimum required size and ring dimensioning, as well as the influence they have on the proper generation of the desired FW patterns. The FWs are particular localized solutions to the wave equation that can be used in many applications, such as new kinds of devices, e. g., acoustic tweezers or scalpels, and especially in various ultrasound medical apparatus. (AU) | |
| Processo FAPESP: | 13/12025-8 - Soluções não difrativas das equações de onda: contribuições a teoria, geração experimental, e aplicações |
| Beneficiário: | Michel Zamboni Rached |
| Modalidade de apoio: | Auxílio à Pesquisa - Pesquisador Visitante - Internacional |