RESEARCH OF THE IMPEDANCE OF A BROADBAND ACOUSTIC PIEZOELECTRIC TRANSDUCER COMPOSED OF DIFFERENT-FREQUENCY EMITTERS

The construction of hydroacoustic underwater surveillance systems is associated with compliance with some necessary requirements for their characteristics. One of them is high distance resolution. The distance resolution is determined by the bandwidth of the emitted and received signals and, consequently, by the bandwidth of the converters employed in the antenna system. The bandwidth of converters is achieved in various ways: by means of traditional methods of expanding the frequency band with an active or passive load, the use of special materials for converters, and the use of parametric modes of emission of acoustic signals. One of the options for constructing such converters may be the use of different-frequency components of piezoelements in one converter, mechanically coupled along the field. In this case, it is necessary to take into account the quality factor of each of the loaded oscillatory systems, and not only the active load on radiation must be considered, but also the damping of the parts of the converter by structural elements