Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1999-02-02
2000-11-14
Lobo, Ian J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367131, G01B 902
Patent
active
061479306
ABSTRACT:
A system for digitally demodulating optical hydrophone signals is provided. The system includes an optical hydrophone connected to an analog-to-digl converter and further connected to a digital signal processor. Within the digital signal processor, a basic demodulator has a first and second mixing tables, the first table operating at a modulating frequency, .omega., injected into reference legs of the hydrophone, and a second table operating at 2.omega.. The mixer frequencies are coherently mixed with the incoming acoustic signals received by the hydrophone. An automatic calibration circuit which adjusts the phase of the mixers is connected to the basic demodulator.
REFERENCES:
patent: 4947408 (1990-08-01), Sadr et al.
patent: 5051965 (1991-09-01), Poorman
patent: 5155707 (1992-10-01), Fisher
patent: 5903350 (1999-05-01), Bush et al.
Amaral Michael
Assard Gerald L.
Deus III Antonio L.
Moretti David J.
Lall Prithvi C.
Lobo Ian J.
McGowan Michael J.
Oglo Michael F.
The United States of America as represented by the Secretary of
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