Typical features and principal differences of electroacoustic characteristics and impedance spectra of compact low-frequency hydroacoustic piezoelectric radiators of high power-density to-weight ratio of the longitudinal-bending, oncoming-piston and inertial-bending types are presented in the paper. Analysis and comparison of electroacoustic characteristics of differ-ent types transducers allow to clear the direction of design search. This is also important to specify technical solutions to overcome contradictions between compact dimensions, band-width, sensitivity, low resonance frequency and efficiency of hydroacoustic radiators. Using the considered types of transducers for different classes of hydroacoustics applications are suggested.
T h e mutual coherence function (MCF) o f the received acoustic field is derived using an analysis based upon coupled mode theory. Separations in transverse horizontal position, t i m e and frequency are treated. T h e mean horizontal array response and t h e shape o f an ensemble-averaged pulse are evaluated from the MCF. T h e application is illustrated by computation o f the considered effects for rough ocean surface scattering in an upper-sound channel.
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