Flextensional hydrophone

Details Flextensional hydrophone Flextensional hydrophone

1992-07-20

1993-05-18

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

Underwater type

367174, 73657, 356345, 356360, 359191, H04R 2300

Patent

active

052126706

ABSTRACT:
An omnidirectional hydrophone having an elastic shell in the form of an ote ellipsoid of revolution having the ratio of its major axis to is minor axis greater than about .sqroot.(2-.nu.) where .nu. is Poisson's ratio of the shell material, wherein the circular circumference of the shell (at different circular parallels of latitude) undergoes strains of opposite sign when the shell is subjected to a pressure change. The differential strains are advantageously measured by an optical fiber interferometer having one leg wound about the equatorial circumference of the shell and another leg spirally wound near one or both of the poles.

REFERENCES:
patent: 4534222 (1985-08-01), Finch et al.
patent: 4799752 (1989-01-01), Carome
patent: 4893930 (1990-01-01), Garrett et al.
patent: 4932783 (1990-06-01), Kersey et al.
patent: 4951271 (1990-06-01), Garrett et al.
patent: 4994668 (1991-02-01), Lagakos et al.
patent: 5140559 (1992-08-01), Fisher

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