Directional sonobuoy

Details Directional sonobuoy Directional sonobuoy

1974-12-19

1978-09-12

Feinberg, Samuel

Communications: electrical

Selective

Having indication or alarm

9 8R, G01V 100

Patent

active

041141377

ABSTRACT:
A sonobuoy having a directional hydrophone centrally enclosed in a flexib 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.

REFERENCES:
patent: 768568 (1904-08-01), Mundy
patent: 1345717 (1920-07-01), Thomas
patent: 3382481 (1968-05-01), Baker
patent: 3803540 (1974-04-01), Mar et al.
patent: 3864771 (1975-02-01), Bauer et al.

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