SENSITIVE ELEMENT FOR PIEZOELECTRIC CABLE ON-BOARD HYDROACOUSTIC ANTENNAE Russian patent published in 2017 - IPC G01S7/521 

FIELD: physics, acoustics.

SUBSTANCE: invention relates to hydroacoustics, and specifically to hydroacoustic navigation systems of underwater vehicles, and can be used in designing on-board hydroacoustic antennae and flexible extended antennae in noise direction-finding systems of surface ship and submarine vessels, as well as in designing towed streamers during offshore exploration of minerals. The technical result is achieved due to that a sensitive element, comprising two piezoelectric coaxial cables with opposite polarisation, includes an elastic circular tube, inside of which there is a bundle of power supply and communication cables, providing operation of data transmission channels, synchronisation and control, and piezoelectric coaxial cables with opposite polarity are wound around the outer surface of the elastic circular tube in two parallel spirals with a gap between adjacent turns with spacing of not less than one diameter thereof, wherein an electronic unit is inserted in a sealed cylindrical housing with sealed focusing sockets, corresponding contacts of which are connected to outputs of the piezoelectric cables and power supply and communication cables, a centering bushing made of elastic material with longitudinal external protrusions is installed and mounted on the housing, and an outer sealing shell is combined with a bearing member and electrostatic shield in form of a mesh braiding with inclusion of laminette yarn therein, the space inside the elastic tube, as well as between the elastic tube, piezoelectric coaxial cables and the sealing shell is filled with a viscous sound-absorbing elastic medium in form of a hydrophobic gel.

EFFECT: invention widens the frequency band of the sensitive element for piezoelectric cable on-board hydroacoustic antennae in the region of low frequencies.

4 cl, 3 dwg