HYDROACOUSTIC TRAILING ANTENNA FOR GEOPHYSICAL WORK Russian patent published in 2014 - IPC G01S7/52 

FIELD: physics, acoustics.

SUBSTANCE: invention relates to hydroacoustics and can be used in seas, oceans and freshwater bodies as a geophysical rope engineering studies at the sea bottom. The hydroacoustic trailing antenna for geophysical work has an external elastic cable sheath inside of which there are receivers which consist of two identical sensitive piezoelectric elements made from an electrically polarised piezoelectric film with electrodes deposited on and strongly bound to its surface, sealed housings fitted with electronic boards with differential amplifiers and analogue-to-digital converters, a digital communication line and a power supply line. Inputs of the differential amplifiers are anti-phase connected to the sensitive piezoelectric elements and outputs are connected to analogue-to-digital converters, outputs of which are connected to the digital communication line. The sealed housings are in form of thin-walled cylinders made of hard plastic, the inner surface of which is respectively fitted with sensitive film-type piezoelectric elements by sides with opposite electric polarisation, wherein the film is stretched in a circular direction, and ends of the cylindrical housings are closed by covers, on the inner surfaces of which there are annular grooves in which seal rings are inserted. Rigid supporting members are placed between the covers inside the sealed housings. The film-type piezoelectric elements are in form of two semicylindrical casings mounted with spacing to the inner surface of the housings with opposite polarisation on their entire length, and the bearing member is in form of mesh braids which are mounted as a reinforcing element in the elastic outer cable sheath.

EFFECT: high sensitivity and reduced dependency on the immersion depth, as well as small diameter of the antenna.

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