An acoustic array driven with a designed set of localized-wave (LW) solutions of the scalar-wave equation generates a robust, well-behaved, transient pencil beam of ultrasound in water. The performance of the LW-pulse-driven array theoretically and experimentally exceeds a tenfold improvement over related continuous-wave excitations of the same array.
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Ziolkowski et al. (1990) studied this question.
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