Fiber optic geophone

Details Fiber optic geophone Fiber optic geophone

1999-10-15

2000-12-19

Moller, Richard A.

Measuring and testing

Speed, velocity, or acceleration

Acceleration determination utilizing inertial element

73653, 73655, G01P 1500

Patent

active

061614335

ABSTRACT:
A geophone includes an optical element capable of changing its refractive index and path length in response to acceleration of the geophone. The sensor component comprises a mass mounted on a fulcrum for rotational movement against the force of a biasing member. An optical fiber is stretched between the casing of the sensor and an extension of the mass, such that rotational movement of the mass about the fulcrum varies the tension in the fiber. Varying the tension in the fiber varies the optical path length and index of refraction of the fiber, and these variations may be detected as a seismic signal. A first set of magnets dampens the vibratory movement of the mass, and a second set of magnets reduces the frequency of the movement of the mass.

REFERENCES:
patent: 4408495 (1983-10-01), Couch et al.
patent: 4545253 (1985-10-01), Avicola
patent: 4739661 (1988-04-01), Bucholtz et al.
patent: 4800267 (1989-01-01), Freal et al.
patent: 4860586 (1989-08-01), Miers et al.
patent: 4915473 (1990-04-01), Haese et al.

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