Optical fibre hydrophone
Patent 4536861 Issued on August 20, 1985. Estimated Expiration Date: 
February 27, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.
February 27, 2004. Estimated Expiration Date is calculated based on simple USPTO term provisions. It does not account for terminal disclaimers, term adjustments, failure to pay maintenance fees, or other factors which might affect the term of a patent.Patent References 3903496 High-sensitivity, low-noise, remote optical fiber Monomodal optical fibre hydrophone operating by the elastooptical effect Optical acoustic sensor Optical resonator single-mode fiber hydrophone Patent #: 4446543 InventorsAssigneeApplicationNo. 06/583644 filed on 02/27/1984US Classes:367/149, Exclusive-type receiver356/477Using fiber or waveguide interferometerExaminersPrimary: Tudor, Harold J.Attorney, Agent or FirmInternational ClassG01H 9/00 (20060101)Foreign Application Priority Data1983-02-25 FRAbstractThe 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.Other References
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