Limited-diffraction wave generation by approaching theoretical X-wave electrical driving signals with rectangular pulses

Castellanos, L.; Calás, H.; Ramos, A.

doi:10.1016/j.ultras.2009.09.013

Cited by 12 publications

(11 citation statements)

References 15 publications

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“…associated with the problem of defining the ring sizes, another important issue we have pointed out is the required sampling process of the FW patterns at the aperture, something that one must bear in mind when designing the annular arrays for the considered FW. To address this point, we explored in this article a simple constantstep sampling approach, leaving other alternatives for future work, in which we also intend to consider pulsed excitations [4], [12] as a possible way for surmounting the known side-lobe problem, met with the use of bessel beams for focusing ultrasonic energy in cW (continuous wave) mode.…”

Section: Some Conclusion and Prospectsmentioning

confidence: 99%

“…This list, obviously, is not at all exhaustive, but is merely illustrative of previous literature related to pulses [3], [4], [11], [12], to single bessel beams [13]- [15], to characteristics of the field emitted by flat annular arrays [16], [17], and to scattering produced by spherical objects [18]- [20]. many references therein could also be considered.…”

Section: A Preliminary Introductionmentioning

confidence: 99%

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Producing acoustic frozen waves: simulated experiments

Prego-Borges

Zamboni‐Rached

Recami

et al. 2013

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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In this paper, we show how appropriate superpositions 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.

show abstract

Section: Some Conclusion and Prospectsmentioning

confidence: 99%

Section: A Preliminary Introductionmentioning

confidence: 99%

Producing acoustic frozen waves: simulated experiments

Prego-Borges

Zamboni‐Rached

Recami

et al. 2013

IEEE Trans. Ultrason., Ferroelect., Freq. Contr.

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“…If we refer more specifically to the application of LWs arXiv:1312.7812v1 [physics.class-ph] 30 Dec 2013 in the areas of Acoustics, one has first to recall the works by J.-y.Lu et al [10], [11], [15], [16], [17], [18], [19], whose principal interest became soon that of applying the ultrasonic X-shaped pulses (endowed with a supersonic peak-velocity, in this case) for medical imaging. Other research related with ultrasonic localized pulses can be found -besides in pioneering papers like [12], [13], [14]-also in [30], [31], [32]. In connection with single Bessel beams, one can recall for instance papers like Refs.…”

Section: Introductionmentioning

confidence: 99%

Producing acoustic ‘Frozen Waves’: Simulated experiments with diffraction/attenuation resistant beams in lossy media

Prego-Borges¹,

Zamboni‐Rached²,

Recami³

et al. 2014

Ultrasonics

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The so-called Localized Waves (LW), and the "Frozen Waves" (FW), have raised significant attention in the areas of Optics and Ultrasound, because of their surprising energy localization properties. The LWs resist the effects of diffraction for large distances, and possess an interesting self-reconstruction -self-healing- property (after obstacles with size smaller than the antenna's); while the FWs, a sub-class of LWs, offer the possibility of arbitrarily modeling the longitudinal field intensity pattern inside a prefixed interval, for instance 0⩽z⩽L, of the wave propagation axis. More specifically, the FWs are localized fields "at rest", that is, with a static envelope (within which only the carrier wave propagates), and can be endowed moreover with a high transverse localization. In this paper we investigate, by simulated experiments, various cases of generation of ultrasonic FW fields, with the frequency of f0=1 MHz in a water-like medium, taking account of the effects of attenuation. We present results of FWs for distances up to L=80 mm, in attenuating media with absorption coefficient α in the range 70⩽α⩽170 dB/m. Such simulated FW fields are constructed by using a procedure developed by us, via appropriate finite superpositions of monochromatic ultrasonic Bessel beams. We pay due attention to the selection of the FW parameters, constrained by the rather tight restrictions imposed by experimental Acoustics, as well as to some practical implications of the transducer design. The energy localization properties of the Frozen Waves can find application even in many medical apparatus, such as bistouries or acoustic tweezers, as well as for treatment of diseased tissues (in particular, for the destruction of tumor cells, without affecting the surrounding tissues; also for kidney stone shuttering, etc.).

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“…Let us recall here some previous work done in connection with ultrasonic non-diffracting fields. This list, obviously, is not at all exhaustive, but is merely illustrative of previous literature related with pulses [3], [4], [11], [12], with single Bessel beams [13], [14], [15], with characteristics of the field emitted by flat annular arrays [16], [17], and with scattering produced by spherical objects [18], [19], [20]. Many references therein could also be considered.…”

Section: A Preliminary Introductionmentioning

confidence: 99%

Producing Acoustic 'Frozen Waves': Simulated experiments

L.¹,

Zamboni‐Rached²,

Recami³

et al. 2012

Preprint

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n 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 static 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.n 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 static 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.

show abstract

Limited-diffraction wave generation by approaching theoretical X-wave electrical driving signals with rectangular pulses

Cited by 12 publications

References 15 publications

Producing acoustic frozen waves: simulated experiments

Producing acoustic frozen waves: simulated experiments

Producing acoustic ‘Frozen Waves’: Simulated experiments with diffraction/attenuation resistant beams in lossy media

Producing Acoustic 'Frozen Waves': Simulated experiments

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