Abstract
Acoustic Bessel Bullets (BB) are defined to be a new class of band-limited Transient Bessel Beams or localized waves which maintain their shape and amplitude as they propagate in space. The space–time properties of acoustic BB fields generated by planar spatial apertures excited with gated sinusoidal excitations are investigated using a recently developed generalized impulse response approach. Analytical results are presented for the general characteristics of acoustic BB fields generated by infinite and finite planar apertures as a function of center excitation frequency and bandwidth. Numerical results are then presented to illustrate the space–time properties of the on-axis field for acoustic BB fields relative to those of a conventional piston source. The near to farfield transition distance for acoustic BB fields is investigated and compared to the Rayleigh distance for a piston source. Important edge wave effects and anomalous spatial decay rates are observed and discussed.
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