Accession Number : ADD006027

Title :   Directional Sonobuoy.

Descriptive Note : Patent,


Personal Author(s) : Mason,Russell I ; Dale,John R

Report Date : 12 Sep 1978

Pagination or Media Count : 6

Abstract : This patent discloses a sonobuoy having a directional hydrophone centrally enclosed in a flexible, acoustically transparent, spherical bag which upon deployment is filled with water to form a hydrosphere. A first embodiment comprises a plurality of upper and lower spreaders which form the bag into a spherical shape having a valve at the bottom most portion thereof for entry of water into the bag during oscillatory motion of the hydrophone. A second embodiment comprises a flexible, acoustically transparent, spherical bag which is time-filled with water by a pump to inflate the bag to a predetermined pressure. The hydrosphere forms a large virtual mass of static water around the hydrophone which reduces near field affects due to flow and motion noise and which also operates as a sea anchor. (Author)

Descriptors :   *Patents, *Sonobuoys, *Hydrophones, Directional, Low noise, Near field, Flow noise, Shielding, Anchors(Marine)

Subject Categories : Acoustic Detection and Detectors

Distribution Statement : APPROVED FOR PUBLIC RELEASE