Optical fibre hydrophone

Details Optical fibre hydrophone Optical fibre hydrophone

1984-02-27

1985-08-20

Tudor, Harold J.

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

356345, H04R 1700

Patent

active

045368619

ABSTRACT:
The invention relates to a monomodal optical fibre hydrophone operating by elastooptical effect, which has an interferometer structure comprising a measuring arm, in which is arranged a very long monomodal optical fibre immersed in the interaction medium in which propagates the soundwave. A phase displacement is induced by an elastooptical effect on the soundwave propagating in the fibre, by a soundwave producing an acoustic pressure field in said medium. A reference arm establishes a reference optical path and the phase displacement, linked with the sound wave, is detected by interferometry between the two optical waves coming from these two arms. This two-armed interferometer is terminated by a photorefractive medium used as an interactive reflector in accordance with the four-wave interferometry principle.

REFERENCES:
patent: 3903496 (1975-09-01), Stimler
patent: 4297887 (1981-11-01), Bucaro
patent: 4320475 (1982-03-01), Leclerc et al.
patent: 4375680 (1983-03-01), Cahill et al.
patent: 4446543 (1984-05-01), McLandrich
Optics Letters, vol. 5, No. 11, (Nov. 1980), T. J. Hall et al., "Detector for an Optical-Fiber Acoustic Sensor Using Dynamic Holographic Interferometry," pp. 485-487.
Applied Optics, vol. 18, No. 24, (Dec. 15, 1979), B. Budiansky et al., "Pressure Sensitivity of a Clad Optical Fiber," p. 4085.
Applied Optics, vol. 19, No. 17, (Sep. 1, 1980), D. A. Jackson et al., "Elimination of Drift in a Single-Mode Optical Fiber Interferometer Using a Piezoelectrically Stretched Coil Fiber," pp. 2926-2929.

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