Abstract
An experimental investigation on the directional factors of radially polarized piezoceramic cylindrical transducers as a function of aspect ratio and for different design boundary conditions (fluid-filled, air-backed, and open-closed squirter) is presented. Several prototypes were tested for their acoustic properties (impedance, transmit sensitivity, and directional factor) For the free-flooded designs, the directional factor radiation transitions from mainly axial to mainly radially (side walls) for increasing height-to-diameter. Also, a model of directional factor is presented using a coaxial array of toroid’s for the free-flooded transducer prototypes.