Method and system for detecting objects at or below the water's

Details Method and system for detecting objects at or below the water's Method and system for detecting objects at or below the water's

1995-08-09

1997-07-08

Hofsass, Jeffery

Communications, electrical: acoustic wave systems and devices

Echo systems

Presence or movement only detection

367 94, 367128, 2504921, G01S 1500

Patent

active

056469071

ABSTRACT:
A method and system are provided for detecting objects at or below a surf of a body of water. A focused beam of amplitude varying electromagnetic radiation, e.g., a pulsed laser beam, is directed through the air towards the water's surface. Acoustic energy under the water's surface is monitored for any acoustic return that may be generated in the water as a result of the beam being incident on either an object at the water's surface or the water's surface above an object.

REFERENCES:
patent: H1231 (1993-09-01), Richards
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patent: 3604803 (1971-09-01), Kahn
patent: 3903520 (1975-09-01), Shostak
patent: 4004212 (1977-01-01), Wortman
patent: 4050819 (1977-09-01), Lichtman
patent: 4290043 (1981-09-01), Kaplan
patent: 4866681 (1989-09-01), Fertig
patent: 4991149 (1991-02-01), Maccabee
patent: 5161125 (1992-11-01), Maccabee
patent: 5316983 (1994-05-01), Fujimori et al.

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