WAVEGUIDE HYDROACOUSTIC TRANSDUCER Russian patent published in 2010 - IPC H04R1/44 H04R17/00 

FIELD: physics.

SUBSTANCE: proposed transducer comprises set of N aligned identical piezo-active rings with acoustically flexible gaskets arranged between the faces of the latter, acoustic screen arranged on transducer outer surface, delay line to increase signal time delay with increase with the number of ring which is connected with every ring via intermediate amplifier and power amplifiers. Note that gain increases sequentially with the number of rings. Note here that signal generator output is connected with said delay line with its N outputs connected with appropriate N inputs of filters with adjustable transmission ratio and filter output is connected with delay line.

EFFECT: smaller weight and seizes, sufficient bandpass and efficient radiation, reduced costs.

2 cl, 4 dwg, 1 ex