Communications – electrical: acoustic wave systems and devices – Sonar counter-measures
Patent
1982-08-31
1995-05-30
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Sonar counter-measures
H04K 300
Patent
active
054208254
ABSTRACT:
A composite for use on submarines and surface craft for controlling self-erated noise when listening with sonar. The composite includes two layers of PVF.sub.2 transducers separated by a layer of phase shifting or absorbing material. The inner transducer senses noise from the ship and subtracts this from the signal from the outer transducer representing noise plus the desired signal. In a second mode the sensed noise is regenerated through the outer transducer 180.degree. out of phase to cancel the noise and allow more accurate detection.
REFERENCES:
patent: 3971250 (1976-07-01), Taylor
patent: 4158189 (1979-06-01), Wardle
patent: 4184093 (1980-01-01), Sullivan
patent: 4236235 (1980-11-01), Gilbert
patent: 4295010 (1981-10-01), Murphy
Castelli Vincent J.
Dickey Joseph W.
Fischer Eugene C.
Montemarano Jean A.
Marsh Luther A.
Miller Charles D.
Pihulic Daniel T.
The United States of America as represented by the Secretary of
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