Patent US4275599A successfully refreshed from Google Patents.
US4275599A
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Sensor for measuring dynamic variations in strain
Assignee: Boeing North American Inc
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Filing: 1979-12-20
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Granted: 1981-06-30
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Expires: 1999-12-20
Abstract
Abstract A sensor for measuring dynamic variations in axial strain in a cable wherein a light source is positioned intermediate a pair of light detectors. The sensor is capable of sensing the effects of dynamic axial tensile and compressive forces in the cable over a wide range of frequencies.
Inventors
- 👤 Charles W. Kohlenberger
- 👤 Craig G. Kirkpatrick
- 👤 John A. Estrada
- 👤 George Q. Chang
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 15:56
CPC Classifications
G; G01; G01L; G01L1/00; G01L1/24; G01B; G01B11/00; G01B11/16; G01D; G01D5/00; G01D5/26
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
106 words
A strain sensor, comprising: a first bracket having a pair of photodetectors mounted thereon, wherein said photodetectors are spaced apart from each other; a second bracket having a light source mounted thereon; means for fastening said first and second brackets to a deformable structure in a manner which disposes said light source intermediate said pair of photodetectors so that strain occurring in said elastic structure causes the distances between one of said photodetectors and said light source to decrease while the distance between the other of said photodetectors and said light source increases; and a sealing container enclosing said light source and said pair of photodetectors.
Claim 2
Dependent Claim
106 words
A strain sensor, comprising: a first bracket having a pair of photodetectors mounted thereon, wherein said photodetectors are spaced apart from each other; a second bracket having a light source mounted thereon; means for fastening said first and second brackets to a deformable structure in a manner which disposes said light source intermediate said pair of photodetectors so that strain occurring in said elastic structure causes the distances between one of said photodetectors and said light source to decrease while the distance between the other of said photodetectors and said light source increases; and a sealing container enclosing said light source and said pair of photodetectors.
Claim 3
Dependent Claim
15 words
The strain sensor recited in claim 1 wherein said light source comprises a light-emitting diode.
Claim 4
Dependent Claim
28 words
The strain sensor recited in claim 1 further comprising electrical means for responding to said photodetectors and producing a signal proportional to the differential output of said photodetectors.
Claim 5
Dependent Claim
19 words
The strain sensor recited in claim 3 wherein said photodetectors are cadmium sulfide, lead sulfide or cadmium selenide cells.
Claim 6
Dependent Claim
20 words
The strain sensor recited in claim 1 wherein said fastening means is adapted for quick release from said deformable structure.
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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) | 1984-06-29 | 1984-12-29 | 1985-06-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1988-06-29 | 1988-12-29 | 1989-06-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1992-06-29 | 1992-12-29 | 1993-06-30 | $7700.00 | Window Closed / Lapsed |