Variable coupler fiber optic sensor hydrophone

Details Variable coupler fiber optic sensor hydrophone Variable coupler fiber optic sensor hydrophone

1989-07-06

1997-09-23

Eldred, J. Woodrow

Communications, electrical: acoustic wave systems and devices

Signal transducers

367149, 73705, 250227, 350 9615, H04R 2300

Patent

active

056711913

ABSTRACT:
A rigid plate with an aperture therethrough has a variable coupler fiber optic sensor encapsulated in the aperture by an encapsulant having an index of refraction that varies with applied stress. Incident light applied to an input fiber of the coupler is coupled to the output fibers thereof in a ratio dependent on the stress applied to the encapsulant. In an alternative embodiment, a well in a member superposed with respect to the plate is filled with a low bulk modulus material which abuts the encapsulant.

REFERENCES:
patent: 4461536 (1984-07-01), Shaw et al.
patent: 4482805 (1984-11-01), Palmer
patent: 4495819 (1985-01-01), Tekippe
patent: 4545253 (1985-10-01), Avicola
patent: 4634858 (1987-01-01), Gerdt et al.
patent: 4729240 (1988-03-01), Sugihara et al.

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