Low frequency sonar systems

Details Low frequency sonar systems Low frequency sonar systems

1980-09-19

1981-12-08

Farley, Richard A.

Communications, electrical: acoustic wave systems and devices

Echo systems

Distance or direction finding

367106, 367155, 367158, G01S 1506, H04R 144

Patent

active

043051405

ABSTRACT:
A lightweight high-power transducer employs an axial array of dual-piston transducer element assemblies which are held in concentric alignment within a rigid cylindrical tube by O-rings set into grooves provided in the periphery of the pistons. The pistons have convex shaped vibratile surfaces which, in combination with the sound transmitting fluid which fills the tubular housing, causes each piston to be effectively radiating into an annular shaped tapered horn whose expanding peripheral annular area terminates into a peripheral opening placed in the circumference of the tubular housing. The combination of the inventive transducer with a tricardioid hydrophone results in a lightweight portable sonar system which achieves long-range target detection with a bearing resolution of 5.degree..

REFERENCES:
patent: 3474403 (1969-10-01), Massa et al.
patent: 4198705 (1980-04-01), Massa

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