US3659043A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Hydrogen fire blink detector
Assignee: National Aeronautics and Space Administration
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Filing: 1970-07-01
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Granted: 1972-04-25
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Expires: 1990-07-01
Abstract
Abstract A hydrogen fire detector for use either on a high altitude rocket or in a ground installation. The device incorporates a conventional vidicon camera and television receiver-monitor. The device also comprises an infrared image converter to change the infrared radiation from the fire to visible light, thus making it possible to view the hydrogen fire on the receiver-monitor. A red and blue filter wheel is placed ahead of the infrared image converter, to produce a blinking image of the infrared light emitting source. This alternately light and dark image is enforced by the persistance characteristic of the eye.
Inventors
- 👤 James M Donnini
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 05:12
CPC Classifications
G; G08; G08B; G08B17/00; G08B17/12
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
157 words
A hydrogen fire detection system comprising: a. a blink detector, for receiving an infrared image of a hydrogen fire and changing said image to a blinking visible image, said blink detector comprising: 1. an optical filter for alternately passing and blocking an infrared image of a hydrogen fire; 2. an infrared image converter optically connected to said optical filter, for changing said infrared image of a hydrogen fire to a visible image; 3. said optical filter comprising a lens system and a filter wheel mounted between said lens system and said infrared image converter, the center of said filter wheel being mounted off the optical center line between said lens system and said image converter, said filter wheel having at least two alternating red and blue color sections; b. a television camera tube optically connected to said blink detector; c. a television receiver-monitor connected to said television camera tube, for video presentation of said blinking visible image.
Claim 2
Dependent Claim
157 words
A hydrogen fire detection system comprising: a. a blink detector, for receiving an infrared image of a hydrogen fire and changing said image to a blinking visible image, said blink detector comprising: 1. an optical filter for alternately passing and blocking an infrared image of a hydrogen fire; 2. an infrared image converter optically connected to said optical filter, for changing said infrared image of a hydrogen fire to a visible image; 3. said optical filter comprising a lens system and a filter wheel mounted between said lens system and said infrared image converter, the center of said filter wheel being mounted off the optical center line between said lens system and said image converter, said filter wheel having at least two alternating red and blue color sections; b. a television camera tube optically connected to said blink detector; c. a television receiver-monitor connected to said television camera tube, for video presentation of said blinking visible image.
Claim 3
Dependent Claim
23 words
an infrared image converter optically connected to said optical filter, for changing said infrared image of a hydrogen fire to a visible image;
Claim 4
Dependent Claim
23 words
an infrared image converter optically connected to said optical filter, for changing said infrared image of a hydrogen fire to a visible image;
Claim 5
Dependent Claim
58 words
The hydrogen fire detection system of claim 1 wherein said image converter tube comprises: a. a photo cathode light sensative screen at its first end; b. a phosphor anode at its opposite end; c. a plurality of accelerating electrodes located between said cathode and said anode; and d. a high voltage power supply Connected to said accelerating electrodes.
Claim 6
Dependent Claim
24 words
The hydrogen fire detection system of claim 2 wherein said connection between said television camera tube and said television receiver-monitor is a wire cable.
Claim 7
Dependent Claim
84 words
said optical filter comprising a lens system and a filter wheel mounted between said lens system and said infrared image converter, the center of said filter wheel being mounted off the optical center line between said lens system and said image converter, said filter wheel having at least two alternating red and blue color sections; b. a television camera tube optically connected to said blink detector; c. a television receiver-monitor connected to said television camera tube, for video presentation of said blinking visible image.
Claim 8
Dependent Claim
84 words
said optical filter comprising a lens system and a filter wheel mounted between said lens system and said infrared image converter, the center of said filter wheel being mounted off the optical center line between said lens system and said image converter, said filter wheel having at least two alternating red and blue color sections; b. a television camera tube optically connected to said blink detector; c. a television receiver-monitor connected to said television camera tube, for video presentation of said blinking visible image.
Claim 9
Dependent Claim
24 words
The hydrogen fire detection system of claim 2 wherein said connection between said television camera tube and said television receiver-monitor is a radio link.
References Cited (Backward Citations)
US2825815A
Cited
US2742578A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1975-04-25 | 1975-10-25 | 1976-04-25 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-04-25 | 1979-10-25 | 1980-04-25 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-04-25 | 1983-10-25 | 1984-04-25 | $7700.00 | Window Closed / Lapsed |