High-efficiency transducers for acoustic diagnostics on the basis of novel anisotropic piezoelectric materials

A major source of the improvement in acoustic means of technical diagnostics is the use of high-efficiency piezoelectric materials in primary information pickups (transducers). The most optimum relation of characteristics is ensured by a new group of so called anisotropic piezoelectric materials possessing a high anisotropy of piezoelectric properties. The PbTiO₃-based PCR-70 and PCR-72 piezoceramics developed by our Institute belong to this group; they are characterized by the high K_t, the high piezoelectric response (g₃₃ >50mV·m/N), the very low mechanical quality (Q_mt<10) and a practically zero value of K_p. The transducer characteristics were studied in a receiving mode during the operation on a massive plate surface. Special steps were taken to remove reverberations. The above properties of piezoelectric materials ensure the high response (1...4·10⁹V/N), a small duration of transient processes and a high selectivity to longitudinal (normal to the operating surface) vibrations for transducers. A combination of the obtained characteristics makes the developed transducers competitive with the best known analogues