HYDROPHONE Russian patent published in 2010 - IPC H04R1/44 

FIELD: physics.

SUBSTANCE: hydrophone comprises cylindrical casing with aligned tubular piezo electric element. Elastic isolating coat is applied on outer surfaces of said cylindrical casing and tubular piezo electric element. Additionally, hydrophone comprises foot connecting cylindrical element with cylindrical hollow casing and mounting board secured in the casing and accommodating preamplifier and capacitor with capacitance equal to that of piezo electric element. Note here that outputs of piezoelectric element and capacitor can be connected to preamplifier input. Note also that said preamplifier and capacitor are arranged on said board in metal screen, while elastic isolating coat is made from two layers of acoustically transparent polyurethane compound. Between said layers, metal layer is arranged electrically connected with metal screen of preamplifier and capacitor.

EFFECT: higher reliability, hydraulic stability and improved directional pattern.

4 cl, 1 dwg