US4648082A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Marine acoustic gradient sensor
Assignee: Ion Geophysical Corp
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Filing: 1985-03-04
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Granted: 1987-03-03
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Expires: 2005-03-04
Abstract
Abstract A pressure gradient sensor is disclosed for optically sensing the direction and magnitude of an acoustic wave propagating through a fluid. Each sensor consists generally of at least three fiber-optic displacement sensors disposed within a circular array oriented perpendicular to the longitudinal axis of a streamer. Each sensor phase-modulates a coherent light signal indicative of the water pressure sensed outside the streamer. The output of the signals include a component due to transient pressure waves and a component due to hydrostatic pressure differences between the sensors.
Inventors
- 👤 Carl H. Savit
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 16:56
CPC Classifications
G; G01; G01V; G01V1/00; G01V1/16; G01V1/20; G01V1/201; G01H; G01H9/00; G01H9/004; G01H9/006
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
164 words
An apparatus for determining a direction adn magnitude of an acoustic signal propagating through a fluid, said apparatus comprising in combination: (a) a cylindrical diaphragm, which is deformable by acoustic signals, having an optically reflective inner circumference; (b) a plurality of optical fibers radially disposed within said deaphragm in substantially the same plane, each of said optical fibers having an end oriented substantially perpendicular to said reflective inner circumference so as to direct and receive a coherent light pulse incident upon said diaphragm whereby deformation of said diaphragm by said acoustic signal phase shifts the received light pulse at said optical fibers by an amount proportional to a change in distance between said optical fibers and the inner circumference of said diaphragm; (c) transmitting means connecting each of said optical fibers to a remote signal processing system; and (d) emitting means connected to said remote signal processing system for lauching the coherent light pulse into each of said optical fibers through said transmitting means.
Claim 2
Independent Claim
164 words
An apparatus for determining a direction adn magnitude of an acoustic signal propagating through a fluid, said apparatus comprising in combination: (a) a cylindrical diaphragm, which is deformable by acoustic signals, having an optically reflective inner circumference; (b) a plurality of optical fibers radially disposed within said deaphragm in substantially the same plane, each of said optical fibers having an end oriented substantially perpendicular to said reflective inner circumference so as to direct and receive a coherent light pulse incident upon said diaphragm whereby deformation of said diaphragm by said acoustic signal phase shifts the received light pulse at said optical fibers by an amount proportional to a change in distance between said optical fibers and the inner circumference of said diaphragm; (c) transmitting means connecting each of said optical fibers to a remote signal processing system; and (d) emitting means connected to said remote signal processing system for lauching the coherent light pulse into each of said optical fibers through said transmitting means.
Claim 3
Dependent Claim
22 words
An apparatus as defined in claim 1 wherein said optical fibers are radially disposed within said diaphragm by a cylindrical supporting means.
Claim 4
Dependent Claim
65 words
An apparatus as defined in claim 2 wherein said supporting means, comprises: a sensor support of generally cylindrical form having an axial hole and a plurality of off-axial holes extending therethrough, at least three longitudinal channels parallel to said axial hole embedded along the outer surface of said support, and each in fluid communication with said axial hole by a passage radiating outwards perpendicularly therefrom.
Claim 5
Dependent Claim
19 words
An apparatus as defined in claim 1 wherein said transmitting means comprises a plurality of single-mode fiber optic strands.
Claim 6
Dependent Claim
141 words
A pressure-gradient sensor for use in a body of fluid, comprising: (a) a fluid-filled housing: (b) a pressure sensitive diaphragm having an optically reflective inner circumference, conforming to the inner surface of said housing; (c) at least one sensor set concentrically disposed within said diaphragm, said set having at least three fiber-optic waveguides radially arranged at preselected locations within substantially the same plane, each of said waveguides oriented so as to direct and receive a coherent light pulse incident upon said diaphragm whereby a change in distance between said waveguide and said diaphragm phase shifts the received light pulse by an amount proportional to the distance change; (d) a transmission bundle connecting each of said waveguides to a remote recording system; and (e) a light source connected to said recording system for launching the coherent light pulse into said transmission bundle.
Claim 7
Dependent Claim
141 words
A pressure-gradient sensor for use in a body of fluid, comprising: (a) a fluid-filled housing: (b) a pressure sensitive diaphragm having an optically reflective inner circumference, conforming to the inner surface of said housing; (c) at least one sensor set concentrically disposed within said diaphragm, said set having at least three fiber-optic waveguides radially arranged at preselected locations within substantially the same plane, each of said waveguides oriented so as to direct and receive a coherent light pulse incident upon said diaphragm whereby a change in distance between said waveguide and said diaphragm phase shifts the received light pulse by an amount proportional to the distance change; (d) a transmission bundle connecting each of said waveguides to a remote recording system; and (e) a light source connected to said recording system for launching the coherent light pulse into said transmission bundle.
References Cited (Backward Citations)
DE556194C
Cited
US3831137A
Cited
US3952281A
Cited
US4078223A
Cited
US4115753A
Cited
US4162397A
Cited
US4320475A
Cited
US4286468A
Cited
US4313192A
Cited
US4360247A
Cited
US4380394A
Cited
US4572949A
Cited
US4488040A
Cited
US4518857A
Cited
US4547869A
Cited
US4545253A
Cited
US4547668A
Cited
US4589286A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1990-03-02 | 1990-09-01 | 1991-03-03 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1994-03-02 | 1994-09-01 | 1995-03-03 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1998-03-02 | 1998-09-01 | 1999-03-03 | $7700.00 | Window Closed / Lapsed |