Producing acoustic frozen waves: simulated experiments
| Autor: | Jose' L. Prego-Borges, Erasmo Recami, Michel Zamboni-Rached, Hugo E. Hernandez-Figueroa |
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| Rok vydání: | 2013 |
| Předmět: |
Physical acoustics
Engineering Physics - Instrumentation and Detectors Acoustics and Ultrasonics Acoustics Transducers FOS: Physical sciences Physics - Classical Physics symbols.namesake Optics Acoustic wave equation Electrical and Electronic Engineering Sound pressure Instrumentation Ultrasonography business.industry Surface acoustic wave Classical Physics (physics.class-ph) Water Instrumentation and Detectors (physics.ins-det) Acoustic wave Models Theoretical Wave equation Sound symbols Ultrasonic sensor business Bessel function |
| Zdroj: | IEEE Transactions on Ultrasonics, Ferroelectrics, and Frequency Control. 60:2414-2425 |
| ISSN: | 0885-3010 |
| DOI: | 10.1109/tuffc.2013.6644744 |
| Popis: | In this paper we show how appropriate superpositions of Bessel beams can be successfully used to obtain arbitrary longitudinal intensity patterns of nondiffracting ultrasonic wavefields with very high transverse localization. More precisely, the method here described allows generating 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 s t a t i c envelope (within which only the carrier wave propagates). Indeed, it is here demonstrated by computer evaluations that these very special beams of non-attenuated 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 >> (FW). 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, like new kinds of devices, such as, e.g., acoustic tweezers or scalpels, and especially various ultrasound medical apparatus; e.g. for attempting the destruction of tumor cells without affecting the preceding and subsequent (and surrounding) tissues. Keywords: Ultrasound; Frozen Waves; Bessel beam superpositions; Non-diffractive waves; Localized Waves; Annular transducers. Latex source file (IEEE-style). Ten pages, with 15 Figures. Replaced with extended improvements. Ms submitted to IEEE TUFFC |
| Databáze: | OpenAIRE |
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