Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1991-11-26
1992-10-13
Eldred, J. Woodrow
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
356345, 356349, 356358, 359141, 359195, G01B 902
Patent
active
051557070
ABSTRACT:
An omni-directional hydrophone having a pair of fiber-optic windings wrapped around a resilient ball to form a spherical acoustic sensor is provided. The fiber-optic pair has a first fiber which has a bonded jacket and a second fiber which has an unbonded jacket. The fiber with the bonded jacket is sensitive to both vibration of the mounting structure and impinging acoustic signals. The fiber with the unbonded jacket is sensitive to vibration but insulated from the acoustic signals. By comparing the signals from the two fibers, the hydrophone detects acoustic signals by detecting the phase difference between the two fibers. As both fibers are equally affected by vibration, there is no phase difference caused by vibration. This mechanization permits the canceling of vibration induced signals while retaining full sensitivity to acoustic signals. The hydrophone uses a standard fiber-optic laser source and detection system to convert the acoustic generated phase change to amplitude dependent voltage signals. The hydrophone is pressure and temperature insensitive.
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patent: 4527749 (1985-07-01), Matthews et al.
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patent: 4649529 (1987-03-01), Avicola
patent: 4994668 (1991-02-01), Lagakos et al.
Lagakos et al, Optimizing Fiber Coatings for Interferometric Acoustic Sens, IEEE Journal of Quantum Electronics, vol. QE-18, No. 4, Apr. 1982.
Ostrowsky, Ed., Fiber and Integrated Optics, 1979 Plenum Press, New York, p. 87.
Borda Gary G.
Eldred J. Woodrow
Miller Charles D.
The United States of America as represented by the Secretary of
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