Feasibility of Producing Acoustic Frozen Waves with Limited Number of Rings

摘要

In optics and acoustics, a particular solution of the wave equation, created by the superposition of Bessel beams of the same frequency, permits obtaining a stationary wave field with a static envelope in space. These solutions are called Frozen Waves and could have multiple potential applications. In this paper, the analysis of frozen waves using different levels of discretized finite aperture annular radiators is presented. The produced fields with these discretized radiators are compared with the field produced by a continuous finite aperture with the same radial distribution calculated to produce a single focus. The discretized radiator was based on a Bessel transducer varying the number of rings for each studied condition. Even though the acoustic frozen field is improved for the most numbers of rings (50 rings transducer), results with the 20 rings transducer show a similar pressure pattern at the focus. This would facilitate experiments for our future applications in ophthalmic ultrasound therapy.