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Patent US4728191A successfully refreshed from Google Patents.
US4728191A
Expired / Lapsed
US
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Divided interferometer employing a single 3×3 coupler/splitter
Assignee: Optical Technologies Inc
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Filing: 1986-10-22
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Granted: 1988-03-01
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Expires: 2006-10-22
Abstract
Abstract Fiberoptic sensors are disclosed employing one, two, or more optical fibers which are connected to a single source of coherent light through a single 3×3 coupler/splitter thereby retaining a larger portion of the coherent light in the system.
Inventors
- 👤 Clarence J. Zarobila
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-07 06:40
CPC Classifications
G; G01; G01D; G01D5/00; G01D5/26; G01D5/32; G01D5/34; G01D5/353; G01D5/35383
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
83 words
A fiber optic sensor comprising a source of coherent light, at least one fiber optic sensor interferometer; means connecting the coherent light to said at least one sensor, said connecting means including a single 3×3 C/S; a demodulator fiber optic interferometer, means connecting said coherent light to the demodulator interferometer, said connecting means including said 3×3 C/S, a first optical detector for said sensor interferometer connected through said 3×3 C/S, a second optical detector for the demodulator interferometer connected through said 3×3 C/S.
Claim 2
Dependent Claim
83 words
A fiber optic sensor comprising a source of coherent light, at least one fiber optic sensor interferometer; means connecting the coherent light to said at least one sensor, said connecting means including a single 3×3 C/S; a demodulator fiber optic interferometer, means connecting said coherent light to the demodulator interferometer, said connecting means including said 3×3 C/S, a first optical detector for said sensor interferometer connected through said 3×3 C/S, a second optical detector for the demodulator interferometer connected through said 3×3 C/S.
Claim 3
Dependent Claim
14 words
The fiber optic sensor as defined in claim 1, wherein the interferometers are Fabry-Perot.
Claim 4
Dependent Claim
13 words
The fiberoptic sensor as defined in claim 1, wherein the interferometers are Michelson.
Claim 5
Dependent Claim
16 words
The fiberoptic sensor as defined in claim 1, wherein the interferometers are configured as Mach-Zehnder cells.
References Cited (Backward Citations)
US4603296A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-03-01 | 1991-08-31 | 1992-03-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-03-01 | 1995-08-31 | 1996-03-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-03-01 | 1999-08-31 | 2000-03-01 | $7700.00 | Window Closed / Lapsed |