Communications – electrical: acoustic wave systems and devices – Signal transducers – Underwater type
Patent
1982-07-28
1985-06-25
Tudor, Harold J.
Communications, electrical: acoustic wave systems and devices
Signal transducers
Underwater type
73655, 350 9615, 356 44, H04B 1300
Patent
active
045258180
ABSTRACT:
An optical fiber hydrophone system in which a single optical fiber is used for all of the acoustical sensors in the system. A signal source and detector provides an optical signal in selected form, such as continuous or pulsed and detects and extracts an identifiable output signal. Each sensor is in the form of a sensing portion of the single optical fiber. Each sensing portion includes two optical reflectors separated one from another by a predetermined length of said optical fiber. Variations in acoustical pressure incident on the sensing portion causes a change in the predetermined length. This causes reflected portions of the optical signal to interfere with one another. Such interference is detectable for extraction of the identifiable output signal. In one form each sensing portion has two terminal branches of a mechanically deformable material, deformable in response to the fluctuations in acoustical pressure. Preferably, the optical fiber has two portions, a sensing portion thereof underwater and having a first optical cavity, and another portion thereof on board a vessel and having a second optical cavity, typically tunable with respect to the optical length thereof to maximize the interference in the detected optical signal.
REFERENCES:
patent: 3273447 (1966-09-01), Frank
patent: 3488124 (1970-01-01), Lambert et al.
patent: 3491848 (1970-01-01), Giles
patent: 4115753 (1978-09-01), Shajenko
patent: 4154529 (1979-05-01), Dyatt
patent: 4162397 (1979-07-01), Bucaro et al.
patent: 4193130 (1980-03-01), Young et al.
patent: 4446543 (1984-05-01), McLandrich et al.
Cielo Paolo G.
McMahon Garfield W.
Her Majesty the Queen in right of Canada, as represented by Mini
Tudor Harold J.
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