Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1992-10-30
1994-05-10
Pihulic, Daniel T.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
H04R 2300
Patent
active
053114850
ABSTRACT:
A miniature fiber optic hydrophone based on the principles of a Fabry-Perot interferometer. The hydrophone, in one embodiment, includes a body having a shaped flexible bladder at one end which defines a volume containing air or suitable gas, and including a membrane disposed adjacent a vent. An optic fiber extends into the body with one end terminating in spaced relation to the membrane. Acoustic waves in the water that impinge on the bladder cause the pressure of the volume therein to vary causing the membrane to deflect and modulate the reflectivity of the Fabry-Perot cavity formed by the membrane surface and the cleaved end of the optical fiber disposed adjacent to the membrane. When the light is transmitted down the optical fiber, the reflected signal is amplitude modulated by the incident acoustic wave. Another embodiment utilizes a fluid filled volume within which the fiber optic extends.
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P. J. Kuzmenko, "Experimental Performance of a Miniature Fabry-Perot Fiber Optic Hydrophone", 8th Optical Fiber Sensors Conference, Jan. 29-31, 1992, Monterey, Calif., pp. 354-357, IEEE Cat. #92CH3107-O.
Davis Donald T.
Kuzmenko Paul J.
Gaither Roger S.
Moser William R.
Pihulic Daniel T.
Sartorio Henry P.
The United States of America as represented by the United States
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