Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1983-11-09
1992-12-29
Moskowitz, Nelson
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
340557, 73657, H04R 2300, H04P 1302
Patent
active
051757133
ABSTRACT:
In order to sense the presence of sound in a remote underwater location, a neutrally buoyant reflector (20) is deployed underwater, and a laser (12) disposed at a remote location aims coherent light at the reflector (20). A detector (24) senses the coherent light reflected from the reflector (20) and compares it in phase with coherent light split from the outgoing beam. The system then provides an indication of the presence of sound by, for instance, amplifying the result of the phase detection to a speaker (26).
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Gomes David W.
Lockheed Sanders, Inc.
Moskowitz Nelson
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