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US 6,307,809 B1Granted
Geophone with optical fiber pressure sensor
AssigneeGeosensor Corporation
InventorsJohn Luscombe, Malcolm Paul Varnham, Erhard Lothar Edgar Kluth
Life of this patent
Estimating the term…
Abstract
A pressure sensitive optical fiber is enclosed within a pressure chamber. A mass is positioned so as to vary the pressure in the pressure chamber in response to a seismic signal. Variations in the chamber pressure are directly detected by the pressure sensitive fiber.
Claims10
A geophone comprising:
- a. a pressure chamber filled with a fluid, the fluid exhibiting a resonant frequency;
- b. a pressure sensitive sensing clement in the pressure chamber;
- and
- c. a proof mass positioned to vary the pressure in the pressure chamber in response to a seismic signal, wherein the proof mass is adapted to remain stationary in response to a seismic signal at a frequency above the resonant frequency, and wherein the pressure chamber is adapted to move in response to the seismic signal.
1 more element
A method of detecting a seismic signal comprising the steps of:
- a. enclosing a pressure sensitive optical fiber within a liquid filled pressure chamber, the liquid in the pressure chamber exhibiting a resonant frequency;
- b. positioning a mass so as to vary the pressure in the pressure chamber in response to a seismic signal, wherein the mass is adapted to remain stationary in response to a seismic signal above the resonant frequency, and wherein the chamber is adapted to move in response to the seismic signal;
- c. directing a light through the optical fiber;
- d. subjecting the chamber to a seismic signal, thereby varying the pressure in the chamber by moving the chamber while the mass remain stationary;
- and
- e. detecting variations in the light as the result of the variations in the pressure in the chamber.
3 more elements
Dependencies are inferred from the claim text.