Patent US4193130A successfully refreshed from Google Patents.
US4193130A
Expired / Lapsed
US
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Fiber optic hydrophone for use as an underwater electroacoustic standard
Assignee: United States Department of the Navy
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Filing: 1978-09-07
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Granted: 1980-03-11
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Expires: 1998-09-07
Abstract
Abstract A fiber optic hydrophone for use as an underwater electroacoustic standard. The hydrophone includes a fiber optic acoustic wave detector in one end of the hydrophone which is subjected to incident acoustical waves. A similar fiber optic is in an acoustically isolated compartment where the optic fiber is not affected by the incident acoustical wave. Comparison of light passing through each coil will determine incidence of an acoustical wave on the detector fiber.
Inventors
- 👤 A. Mark Young
- 👤 Theodore A. Henriquez
- 👤 Allan C. Tims
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 06:40
CPC Classifications
H; H04; H04R; H04R23/00; H04R23/008; G; G01; G01H; G01H9/00; G01H9/004; G01S; G01S1/00; G01S1/72
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
133 words
An acousto-optical, hydrostatic pressure and temperature-stable hydrophone comprising: optical fiber, acoustical energy sensor means assembled within an acoustically transparent chamber; optical fiber, acoustical energy reference means assembled within an acoustically isolated chamber in axial alignment with said acoustically transparent chamber, said acoustically transparent chamber and said acoustically isolated chamber including a fluid medium filling the space therein and having an acoustic impedance substantially the same as that of a medium in which said hydrophone is to operate; acoustically opaque wall means for separating said acoustically transparent chamber from said acoustically isolated chamber; and means within said wall means for permitting fluid confined within and shared by said chambers to flow between said acoustically transparent chamber and said acoustically isolated chamber to maintain each of said chambers at the same operating pressure and temperature.
Claim 2
Dependent Claim
133 words
An acousto-optical, hydrostatic pressure and temperature-stable hydrophone comprising: optical fiber, acoustical energy sensor means assembled within an acoustically transparent chamber; optical fiber, acoustical energy reference means assembled within an acoustically isolated chamber in axial alignment with said acoustically transparent chamber, said acoustically transparent chamber and said acoustically isolated chamber including a fluid medium filling the space therein and having an acoustic impedance substantially the same as that of a medium in which said hydrophone is to operate; acoustically opaque wall means for separating said acoustically transparent chamber from said acoustically isolated chamber; and means within said wall means for permitting fluid confined within and shared by said chambers to flow between said acoustically transparent chamber and said acoustically isolated chamber to maintain each of said chambers at the same operating pressure and temperature.
Claim 3
Dependent Claim
29 words
A hydrophone as claimed in claim 1 in which: said optical fiber acoustical energy sensor means and said optical fiber reference means are each coils of the same dimensions.
Claim 4
Dependent Claim
22 words
A hydrophone as claimed in claim 2 in which: said means for permitting fluid flow between said chambers are low-pressure "pop" valves.
Claim 5
Dependent Claim
48 words
A hydrophone as claimed in claim 2 in which: said means for permitting fluid flow between said chambers is an orifice whose impedance at high frequencies prevents sound pressure from reaching said optical fiber reference means; and said optical fiber reference means chamber is substantially surrounded with air.
Claim 6
Dependent Claim
38 words
A hydrophone as claimed in claim 3 in which: said optical fiber reference means chamber is of a thin cylindrical wall structure which permits acoustical signals at low frequencies to pass through to said optical fiber reference means.
Claim 7
Dependent Claim
30 words
A hydrophone as claimed in claim 2 which includes: a thin metal diaphragm in an aperture in said wall means separating said acoustically transparent chamber from said acoustically isolated chamber.
Claim 8
Dependent Claim
30 words
A hydrophone as claimed in claim 5 which includes: a thin metal diaphragm in an aperture in said wall means separating said acoustically transparent chamber from said acoustically isolated chamber.
References Cited (Backward Citations)
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USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1983-03-11 | 1983-09-10 | 1984-03-11 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1987-03-11 | 1987-09-10 | 1988-03-11 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1991-03-11 | 1991-09-10 | 1992-03-11 | $7700.00 | Window Closed / Lapsed |