US3612879A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Infrared scanner with reference heat source mounted peripherally of rotational optical system
Assignee: Pharos AB
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Filing: 1969-12-01
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Granted: 1971-10-12
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Expires: 1989-12-01
Abstract
Abstract A line scanner for infrared radiation includes a rotatable unit including an optical system which transmits received radiation to an infrared detector during a scanning period determined by an aperture in the wall of a housing for the unit. A reference heat source in the form of a metallic plate is mounted on the interior wall of the housing peripherally of the rotatable unit so that the radiation produced thereby passes through the entire optical system during scanning by the system.
Inventors
- 👤 Claes Thomas Ohman
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-22 20:27
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/52; H; H04; H04N; H04N3/00; H04N3/02; H04N3/08; H04N3/09
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
125 words
An infrared scanning system comprising a detector responsive to infrared radiation, an optical system for receiving infrared radiation in the direction of an optical axis thereof, and for transmitting received radiation to said detector, rotatable means for imparting a rotating motion to said optical system to cause a scanning movement of said optical axis, means for limiting the portion of the scanning movement of said system during which infrared radiation is received from an area of interest to a predetermined scanning range, and a reference heat source mounted peripherally of said optical system and outside of said scanning range so that radiation from said reference source passes through the entire said optical system for a portion of said scanning movement outside of said scanning range.
Claim 2
Dependent Claim
125 words
An infrared scanning system comprising a detector responsive to infrared radiation, an optical system for receiving infrared radiation in the direction of an optical axis thereof, and for transmitting received radiation to said detector, rotatable means for imparting a rotating motion to said optical system to cause a scanning movement of said optical axis, means for limiting the portion of the scanning movement of said system during which infrared radiation is received from an area of interest to a predetermined scanning range, and a reference heat source mounted peripherally of said optical system and outside of said scanning range so that radiation from said reference source passes through the entire said optical system for a portion of said scanning movement outside of said scanning range.
Claim 3
Dependent Claim
38 words
A scanning system as claimed in claim 1 wherein said rotatable means comprises rotatable unit, said system further comprising a housing in which said unit is mounted, said housing having an aperture therein for defining said scanning range.
Claim 4
Dependent Claim
25 words
A sCanning system as claimed in claim 2 wherein said reference heat source comprises a metallic plate mounted on an inside wall of said housing.
Claim 5
Dependent Claim
40 words
A scanning system as claimed in claim 3 wherein said housing is cylindrical and said plate is arcuate in cross section and is mounted opposite said aperture, said optical axis extending radially from the axis of rotation of said unit.
Claim 6
Dependent Claim
15 words
A scanning system as claimed in claim 4 wherein said plate is constructed of copper.
References Cited (Backward Citations)
US3350562A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1974-10-11 | 1975-04-12 | 1975-10-12 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-11 | 1979-04-12 | 1979-10-12 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-11 | 1983-04-12 | 1983-10-12 | $7700.00 | Window Closed / Lapsed |