US4782331A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Photoelectric icing detector
Assignee: US Philips Corp
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Filing: 1987-06-10
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Granted: 1988-11-01
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Expires: 2007-06-10
Abstract
Abstract An arrangement for the detection of icing on the surface of an object includes an optical conductor in which the radiation from a source strikes at least one plane of the conductor, which is located in the area of the surface to be tested and which is accessible from outside the object, and a detector which receive the radiation coming from this conductor plane and converts it into an electrical signal. An evaluation device compares the signal which a threshold value and, depending on the result of the comparison, generates an alarm signal.
Inventors
- 👤 Gerd H. Martens
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 21:02
CPC Classifications
G; G08; G08B; G08B19/00; G08B19/02; B; B64; B64D; B64D15/00; B64D15/20; F; F25; F25D; F25D21/00; F25D21/02; F25B; F25B2700/00; F25B2700/11; F25B2700/111
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
102 words
An arrangement for the detection of icing on the surface of an object comprising a source for generating a parallel beam of optical radiation, an optical conductor in the shape of a prism and having two faces which project above the surface on which icing is to be detected, said radiation beam striking one of said faces from inside the conductor, a detector which receives radiation reflected from both of said faces and converts it into an electrical signal, an evaluation device which compares the signal with a threshold value and, depending on the result of the comparison, generates an alarm signal.
Claim 2
Dependent Claim
102 words
An arrangement for the detection of icing on the surface of an object comprising a source for generating a parallel beam of optical radiation, an optical conductor in the shape of a prism and having two faces which project above the surface on which icing is to be detected, said radiation beam striking one of said faces from inside the conductor, a detector which receives radiation reflected from both of said faces and converts it into an electrical signal, an evaluation device which compares the signal with a threshold value and, depending on the result of the comparison, generates an alarm signal.
Claim 3
Dependent Claim
28 words
An arrangement as in claim 1 wherein the prism forms an angle of about 90° between the faces and the beam is essentially parallel to the angle bisector.
Claim 4
Dependent Claim
16 words
An arrangement as in claim 1 wherein the prism is in the shape of a cone.
Claim 5
Dependent Claim
24 words
An arrangement as in claim 1 wherein the source of optical radiation and the detector are connected to the optical conductor via optical fibers.
Claim 6
Dependent Claim
18 words
An arrangement as in claim 1 wherein the optical radiation is infrared radiation close to the visible range.
References Cited (Backward Citations)
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1991-11-01 | 1992-05-02 | 1992-11-01 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-11-01 | 1996-05-02 | 1996-11-01 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-11-01 | 2000-05-02 | 2000-11-01 | $7700.00 | Window Closed / Lapsed |