Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1992-09-09
1993-07-27
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
367153, 359141, 356345, 25022714, H04B 900, H04R 2300
Patent
active
052316114
ABSTRACT:
A hydrophone array employing a plurality of laser sources coupled onto a single optical fiber communications link. A matching plurality of optical fiber resonant rings, each having a resonance peak at a wavelength substantially equal to the center wavelength of one of the lasers, is selectively coupled to the optical fiber communication link so that substantially only optical energy in a narrow bandwidth around one of the laser center wavelengths is coupled to the corresponding one of the optical fiber resonant rings. Corresponding photodetectors are also wavelength selectively coupled to the optical fiber communications link so that each detector receives only optical energy corresponding to the wavelength of one of the lasers and its corresponding resonant ring, to provide an output signal indicating variations in acoustic pressure at individual resonant rings in the array.
REFERENCES:
patent: 4451151 (1984-05-01), Huignard
patent: 4648083 (1987-03-01), Giallorenzi
patent: 4875775 (1989-10-01), Michal et al.
patent: 5051965 (1991-09-01), Poorman
patent: 5155548 (1992-10-01), Danver et al.
Eldred J. Woodrow
The Charles Stark Draper Laboratory Inc.
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