Electroacoustic evaluations of 1-3 piezocomposite SonoPanel(TM ) materials.

An advanced configuration 1-3 piezocomposite, designated by its manufacturer as SonoPanel(TM), has been investigated for potential underwater acoustical applications. In-air electromechanical characteristics and in-water acoustical properties of the SonoPanel(TM) were experimentally examined. The in-air impedance measurement results showed the existence of parasitic modes in the composite panel in addition to the expected thickness mode. This modal behavior is identified to be related to the piezocomposite structure. In-water acoustical properties of the new 1-3 piezocomposite panels were investigated as a function of temperature, hydrostatic pressure, and frequency. The effect of underwater explosive shock on the acoustic responses showed no detrimental effects in mechanical structure or acoustical performance of the piezocomposite panel. Linearity with electrical drive level and hydrostatic pressure stability of the 1-3 piezocomposites also were established. These results suggest that the SonoPanel(TM) piezocomposite material is potentially useful for underwater acoustical applications, particularly in applications in which large area coverage is desired.