US5430815A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Optical fiber water sensor
Assignee: Tyco International Ltd Bermuda
•
Filing: 1993-02-05
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Granted: 1995-07-04
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Expires: 2013-02-05
Abstract
Abstract An optical fiber water sensor includes a mandrel having a convex or concave shape adjacent to an optical fiber which is adjacent to a water swellable material held in a reservoir. Upon coming in contact with water, the material swells and deforms a section of the optical fiber about a contour defined by the mandrel thus attenuating a signal propagating through the fiber which is detected by an optical detector to indicate the presence of water.
Inventors
- 👤 Nelson M. Shen
- 👤 David A. Horsma
- 👤 Marc F. Moisson
- 👤 Narendra Kulkarni
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-08 03:13
CPC Classifications
G; G01; G01M; G01M3/00; G01M3/02; G01M3/04; G01M3/042; G01M3/045; G01M3/047; G01N; G01N19/00; G01N19/10
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
136 words
An optical fiber water sensor, comprising: a substrate having a curved mandrel formed on a side thereof; an optical fiber disposed adjacent the mandrel and being oriented such that it can be deflected around a curved contour of the mandrel upon being urged toward the mandrel; a liquid swellable material disposed adjacent the optical fiber and oriented such that upon coming in contact with a liquid the material swells and urges the optical fiber around the curved contour, the curved contour having a radius of curvature smaller than a minimum bend radius of the fiber, wherein the minimum bend radius is less than 7 millimeters, the fiber being bent about a sector angle greater than 30°, and the liquid swellable material when saturated introduces a loss in the optical fiber which is less than 1.25 db.
Claim 2
Dependent Claim
136 words
An optical fiber water sensor, comprising: a substrate having a curved mandrel formed on a side thereof; an optical fiber disposed adjacent the mandrel and being oriented such that it can be deflected around a curved contour of the mandrel upon being urged toward the mandrel; a liquid swellable material disposed adjacent the optical fiber and oriented such that upon coming in contact with a liquid the material swells and urges the optical fiber around the curved contour, the curved contour having a radius of curvature smaller than a minimum bend radius of the fiber, wherein the minimum bend radius is less than 7 millimeters, the fiber being bent about a sector angle greater than 30°, and the liquid swellable material when saturated introduces a loss in the optical fiber which is less than 1.25 db.
Claim 3
Dependent Claim
20 words
The sensor of claim 1, further comprising a second substrate having a reservoir therein which contains the liquid swellable material.
Claim 4
Dependent Claim
12 words
The sensor of claim 1, the curved mandrel having a convex shape.
Claim 5
Dependent Claim
12 words
The sensor of claim 1, the curved mandrel having a concave shape.
Claim 6
Dependent Claim
20 words
The sensor of claim 1, the swellable material comprising a rubber or a gel which swells upon exposure to water.
Claim 7
Dependent Claim
138 words
An optical fiber water sensor, consisting essentially of: a substrate having a curved mandrel formed on a side thereof; an optical fiber disposed adjacent the mandrel and being oriented such that it can be deflected around a curved contour of the mandrel upon being urged toward the mandrel; a liquid swellable material disposed adjacent the optical fiber and oriented such that upon coming in contact with a liquid the material swells and urges the optical fiber around the curved contour, the curved contour having a radius of curvature smaller than a minimum bend radius of the fiber, wherein the minimum bend radius is less than 7 millimeters, the fiber being bent about a sector angle greater than 30°, and the liquid swellable material when saturated introduces a loss in the optical fiber which is less than 1.25 db.
Claim 8
Dependent Claim
138 words
An optical fiber water sensor, consisting essentially of: a substrate having a curved mandrel formed on a side thereof; an optical fiber disposed adjacent the mandrel and being oriented such that it can be deflected around a curved contour of the mandrel upon being urged toward the mandrel; a liquid swellable material disposed adjacent the optical fiber and oriented such that upon coming in contact with a liquid the material swells and urges the optical fiber around the curved contour, the curved contour having a radius of curvature smaller than a minimum bend radius of the fiber, wherein the minimum bend radius is less than 7 millimeters, the fiber being bent about a sector angle greater than 30°, and the liquid swellable material when saturated introduces a loss in the optical fiber which is less than 1.25 db.
Claim 9
Dependent Claim
20 words
The sensor of claim 6, further comprising a second substrate having a reservoir therein which contains the liquid swellable material.
Claim 10
Dependent Claim
12 words
The sensor of claim 6, the curved mandrel having a convex shape.
Claim 11
Dependent Claim
21 words
The sensor of claim 8 wherein the optical fiber is adjacent the curved convex shaped mandrel and the liquid swellable material.
Claim 12
Dependent Claim
12 words
The sensor of claim 6, the curved mandrel having a concave shape.
Claim 13
Dependent Claim
20 words
The sensor of claim 6, the swellable material comprising a rubber or a gel which swells upon exposure to water.
Claim 14
Dependent Claim
141 words
An optical fiber water sensor, comprising: a substrate having a curved mandrel formed on a side thereof; an optical fiber disposed adjacent the mandrel and being oriented such that it can be deflected around a curved contour of the mandrel upon being urged toward the mandrel; a liquid swellable material disposed adjacent and along a length of the optical fiber and oriented such that upon coming in contact with a liquid the material swells and urges the optical fiber around the curved contour, the curved contour having a radius of curvature smaller than a minimum bend radius of the fiber, wherein the minimum bend radius is less than 7 millimeters, the fiber being bent about a sector angle greater than 30°, and the liquid swellable material when saturated introduces a loss in the optical fiber which is less than 1.25 db.
Claim 15
Dependent Claim
141 words
An optical fiber water sensor, comprising: a substrate having a curved mandrel formed on a side thereof; an optical fiber disposed adjacent the mandrel and being oriented such that it can be deflected around a curved contour of the mandrel upon being urged toward the mandrel; a liquid swellable material disposed adjacent and along a length of the optical fiber and oriented such that upon coming in contact with a liquid the material swells and urges the optical fiber around the curved contour, the curved contour having a radius of curvature smaller than a minimum bend radius of the fiber, wherein the minimum bend radius is less than 7 millimeters, the fiber being bent about a sector angle greater than 30°, and the liquid swellable material when saturated introduces a loss in the optical fiber which is less than 1.25 db.
Claim 16
Dependent Claim
20 words
The sensor of claim 12, further comprising a second substrate having a reservoir therein which contains the liquid swellable material.
Claim 17
Dependent Claim
12 words
The sensor of claim 12, the curved mandrel having a convex shape.
Claim 18
Dependent Claim
21 words
The sensor of claim 14 wherein the optical fiber is adjacent the curved convex shaped mandrel and the liquid swellable material.
Claim 19
Dependent Claim
12 words
The sensor of claim 12, the curved mandrel having a concave shape.
Claim 20
Dependent Claim
21 words
The sensor of claim 3 wherein the optical fiber is adjacent the curved convex shaped mandrel and the liquid swellable material.
References Cited (Backward Citations)
US4159420A
Cited
US4221962A
Cited
US4443700A
Cited
GB2100420A
Cited
US4637729A
Cited
US4634856A
Cited
US4750796A
Cited
US4926165A
Cited
US4729630A
Cited
US4812014A
Cited
US5082719A
Cited
US4918305A
Cited
US4891511A
Cited
US5138152A
Cited
US5243670A
Cited
US5193129A
Cited
US5157752A
Cited
US5262640A
Cited
US5222165A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1998-07-03 | 1999-01-02 | 1999-07-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 2002-07-03 | 2003-01-02 | 2003-07-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2006-07-03 | 2007-01-02 | 2007-07-04 | $7700.00 | Window Closed / Lapsed |