Underwater acoustic generator using pulse engine and gas...

Details Underwater acoustic generator using pulse engine and gas... Underwater acoustic generator using pulse engine and gas...

2006-12-05

2006-12-05

Pihulic, Dan (Department: 3662)

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

Reexamination Certificate

active

07145836

ABSTRACT:
A high-pressure, moving-piston pulse engine (modified HIPPE)10is used to produce one or a series of pulses of acoustic energy in a marine environment for acoustic communication, detection, classification or jamming. The HIPPE engine10is modified by removing its nozzle and replacing it with a pipe58which is fastened to the exit of the combustion chamber56. A gas disperser60is affixed to the engine10or pipe58so that a portion of the disperser60extends inside of the pipe58the inner surface of which is spaced from the outer surface of the disperser60so that an annular void is formed between the pipe58and the disperser, through which void the combustion gases can be vented. The axial course of the gases is changed by disperser60to a controlled course with velocity vectors transverse to the pipe axis. The engine10is placed in a body of water14at depth or near the surface and operated either manually or automatically. The pulses can conform to a pulse code for transmitting a pulse-coded message from a ship16to a submarine, for example.

REFERENCES:
patent: 3679021 (1972-07-01), Goldberg
patent: 3701319 (1972-10-01), Axelson et al.
patent: 3903988 (1975-09-01), Hermsen et al.
patent: 4258546 (1981-03-01), Stratton
patent: 4353431 (1982-10-01), Kirby

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