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US3576944A
Expired / Lapsed
US
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Scanning radiometer with plural reference sources
Assignee: United States Department of the Navy
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Filing: 1969-01-28
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Granted: 1971-05-04
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Expires: 1989-01-28
Abstract
Abstract A scanning radiometer for producing long wave length infrared photographs and radiometric measurements. The instrument provides a raster type area scan by varying the horizontal and vertical field-of-view of the instrument. A detector produces a video signal which can be displayed on an oscilloscope and recorded with a camera to produce an area scanned picture.
Inventors
- 👤 Kenneth B Labaw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 15:57
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/52
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
149 words
A scanning radiometer comprising: a plurality of reference source sources of black body radiation; a scanning mirror positioned to receive and reflect infrared radiation from a field of view comprising horizontal and vertical components; means for rotating said scanning mirror to receive infrared radiation sequentially from the horizontal component of the field of view and from the black body reference sources; means for tilting the scanning mirror in a timed relationship with the rotation of the scanning mirror to produce a scan of the vertical component of the field of view; an infrared sensitive detector for producing video signals proportional to the amount of infrared radiation reflected thereon by the scanning mirror; means for displaying the video signals produced by the detector on an oscilloscope; and camera means for recording the oscilloscope display; so that a ''''heat picture'''' of the raster area scanned is produced by the camera means.
Claim 2
Dependent Claim
149 words
A scanning radiometer comprising: a plurality of reference source sources of black body radiation; a scanning mirror positioned to receive and reflect infrared radiation from a field of view comprising horizontal and vertical components; means for rotating said scanning mirror to receive infrared radiation sequentially from the horizontal component of the field of view and from the black body reference sources; means for tilting the scanning mirror in a timed relationship with the rotation of the scanning mirror to produce a scan of the vertical component of the field of view; an infrared sensitive detector for producing video signals proportional to the amount of infrared radiation reflected thereon by the scanning mirror; means for displaying the video signals produced by the detector on an oscilloscope; and camera means for recording the oscilloscope display; so that a ''''heat picture'''' of the raster area scanned is produced by the camera means.
Claim 3
Dependent Claim
29 words
The scanning radiometer as set forth in claim 1 wherein: said reference sources, said scanning mirror, said rotating means, and said detector retain their respective positions during said tilting.
Claim 4
Dependent Claim
35 words
The scanning radiometer as set forth in claim 1 wherein: the reference sources of black body radiation are four in number; and there are approximately 170* in the horizontal component of the field of view.
Claim 5
Dependent Claim
47 words
The scanning r ad radiometer as set forth in claim 3 wherein; three of the black body reference sources of radiation are blackened cones fitted to Dewar flasks; and the fourth is a heated cone having a temperature controllable from about 60* C. to about 200* C.
Claim 6
Dependent Claim
77 words
The scanning radiometer as set forth in claim 4 wherein: the means for tilting the scanning mirror in a timed relationship with the rotation of the scanning mirror comprise; a rotating jackscrew driven by a motor, and a pair of limit switches which trip when the jackscrew tilts the scanning mirror to the maximum from the horizontal plane in either direction, so that the direction of rotation of the jackscrew reverses whenever a limit switch is tripped.
Claim 7
Dependent Claim
130 words
The scanning radiometer as set forth in claim 5 wherein: the oscilloscope is triggered to produce a beam when: either limit switch is tripped, and the scanning mirror rotates past a predetermined point in the horizontal component of the field of view; the beam is caused to sweep across the oscilloscope screen in a timed relationship with the rotation of the scanning mirror by a ramp voltage generator; so that the beam sweeps once across the screen as the scanning mirror rotates through the horizontal field of view; the beam blanks and retraces when the scanning mirror rotates past a second predetermined point in the horizontal component of the field of view; so that scanning continues until the desired raster area is scanned and the other limit switch is tripped.
Claim 8
Dependent Claim
24 words
The scanning radiometer as set forth in claim 6 wherein; the scanning mirror is rotated at approximately 600 r.p.m. or 10 sweeps per second.
Claim 9
Dependent Claim
18 words
The scanning radiometer as set forth in claim 7 wherein; the detector comprises a helium-cooled germanium copper detector.
Claim 10
Dependent Claim
17 words
The scanning radiometer as set forth in claim 7 wherein; the detector comprises a hydrogen-cooled germanium-mercury detector.
Claim 11
Dependent Claim
17 words
The scanning radiometer as set forth in claim 7 wherein; the detector comprises a silicon photo-diode detector.
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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) | 1974-05-03 | 1974-11-02 | 1975-05-04 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-05-03 | 1978-11-02 | 1979-05-04 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-05-03 | 1982-11-02 | 1983-05-04 | $7700.00 | Window Closed / Lapsed |