Hydroacoustic emmiter/receiver based on A0 lamb wave in piezoelectric structure

The theoretical and experimental investigations of the influence of the nanocomposite polymeric layers on the efficiency and radiation angle of acoustic wave into liquid have been carried out. It has been theoretically shown and experimentally confirmed that in the case of using the nanocomposite polymeric material based on the polyethylene of low density with nanoparticles of cadmium sulfide of concentration 25% as an intermediate layer between the plate of 128YX LiNbO₃ and water medium, the power of radiation can be increased by ~1.6 dB/λ for the ratio of the thicknesses of the layer and plate d/h=0.154 at f=1.3 MHz. It has been also shown that the presence of nanocomposite film leads to the increase of the angle of bulk acoustic wave radiation into liquid and allows the effective operation of the radiator not only in the sweet water but also in salt one. The obtained results may be used for the development of effective waveguide hydroacoustic antennas.