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Titolo:
Focal translation by frequency shift in free space
Autore:
Song, HC; Roux, P; Kuperman, WA;
Indirizzi:
Univ Calif San Diego, Scripps Inst Oceanog, Marine Phys Lab, La Jolla, CA 92093 USA Univ Calif San Diego La Jolla CA USA 92093 ys Lab, La Jolla, CA 92093 USA Univ Paris 07, ESPCI, Lab Ondes & Acoust, CNRS,URA 1503, F-75005 Paris, France Univ Paris 07 Paris France F-75005 CNRS,URA 1503, F-75005 Paris, France
Titolo Testata:
IEEE TRANSACTIONS ON ULTRASONICS FERROELECTRICS AND FREQUENCY CONTROL
fascicolo: 3, volume: 47, anno: 2000,
pagine: 687 - 695
SICI:
0885-3010(200005)47:3<687:FTBFSI>2.0.ZU;2-N
Fonte:
ISI
Lingua:
ENG
Soggetto:
TIME-REVERSAL MIRROR; PHASE-CONJUGATION; HYPERTHERMIA; RANGE;
Tipo documento:
Article
Natura:
Periodico
Settore Disciplinare:
Engineering, Computing & Technology
Citazioni:
12
Recensione:
Indirizzi per estratti:
Indirizzo: Song, HC Univ Calif San Diego, Scripps Inst Oceanog, Marine Phys Lab, La Jolla, CA 92093 USA Univ Calif San Diego La Jolla CA USA 92093 a Jolla, CA 92093 USA
Citazione:
H.C. Song et al., "Focal translation by frequency shift in free space", IEEE ULTRAS, 47(3), 2000, pp. 687-695

Abstract

Variable focusing in range from a transmit array can be accomplished by a frequency shift in an acoustic waveguide [1]. In this paper, a general algorithm is derived in free space that can move the focal spot of a linear transmit array both transversely and horizontally. In particular, for variablerange focusing, the prescribed frequency shift is the same for all elements of the array, whereas, for transverse focal shifts, the frequency shift varies with element location in the array. The method described in this paper is especially suitable for varying the location of the focal spot of a time-reversal mirror in the presence of an aberrating layer in that no knowledge of the medium properties is necessary. Simulation results demonstratingthe proposed method are presented in comparison with those from a conventional steering method.

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Documento generato il 09/07/20 alle ore 01:25:44