A review of acoustic localized wave phenomenology

Abstract

A brief review of the history that led to several classes of exact solutions of scalar wave equations that describe localized transmission of acoustic wave energy will be given. It has been shown that these acoustic localized wave (LW) solutions can be optimized so that they are localized near the direction of propagation and their original amplitude is recovered out to extremely large distances from their initial location. Pulses with these very desirable localized transmission characteristics have a number of potential applications in the areas of directed energy systems, secure communications, and remote sensing. Simulations will be shown for several aspects of LW pulse-driven arrays. Various performance criteria including near-field and far-field sidelobe, intensity, and energy distributions will also be discussed for acoustic LW pulse-driven arrays. Since these LW arrays deal with different ultra-wide bandwidth driving pulses at each element of the array, these criteria are generalizations of the standard continuous wave (CW), phased array results. Recent attempts to reduce the equivalent sidelobe levels will also be discussed. Past acoustic experimental setups and results will be summarized briefly in regards to all of these time domain versus frequency issues.