Bessel-like response in transducer based on homogeneously poled piezoelectric disks: Modeling and experimental analysis

The study of ultrasonic Bessel transducers is motivated by their ability to produce limited diffraction ultrasonic beams, providing improved lateral resolution and large penetration depth in the related ultrasonic field. There are three principal methods to construct a Bessel transducer. On the other hand, it is well known that radial modes in homogeneously poled piezoelectric disks (HPPD) are governed by a typical Bessel differential equation. In this paper, the possibility to generate Bessel radiation using a thickness HPPD is proposed and experimentally evaluated, by analyzing the field effects of the disk vibrations when it is driven in its radial modes PACS.