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US4928012A
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System for measuring electromagnetic radiation originating from the hemisphere
Assignee: Deutsches Zentrum für Luft- und Raumfahrt eV
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Filing: 1989-10-19
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Granted: 1990-05-22
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Expires: 2009-10-19
Abstract
Abstract A system for measuring electromagnetic radiation originating from the hemhere corresponding to a solid angle of 2π is provided wherein a highly sensitive low-inertia detector is disposed below a transmissive dome and wherein the chopped light detection method is utilized. There are provided above the transmissive dome two similarly or differently designed modulators which are in the shape of dome segments and which are fitted into each other. At least one of the modulators rotates about their common vertical axis or the modulators may both rotate about the common vertical axis, either at the same or a different speed in the same direction or in opposite directions.
Inventors
- 👤 Dieter Lorenz
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 23:05
CPC Classifications
G; G01; G01J; G01J1/00; G01J1/02; G01J1/04; G01J1/0407; G01J1/044; G01J5/00; G01J5/02; G01J5/08; G01J5/0803; G01J5/0805; G01J1/0252; G01J1/0488; G01J1/42; G01J2001/4266; G01J2001/4285
Claims Analysis
Total Claims: 15
Claim 1
Independent Claim
90 words
A system for measuring electromagnetic radiation originating from the hemisphere corresponding to a solid angle of 2π, comprising at least one low-inertia detector disposed below of a transmissive dome and two modulators in the shape of dome segments having a common vertical axis which are fitted to each other and means for rotating both of said modulators about the common vertical axis at different relative speed to each other so that the low-inertia detector is exposed to the average electromagnetic radiation from the entire hemisphere which is measured over time.
Claim 2
Independent Claim
90 words
A system for measuring electromagnetic radiation originating from the hemisphere corresponding to a solid angle of 2π, comprising at least one low-inertia detector disposed below of a transmissive dome and two modulators in the shape of dome segments having a common vertical axis which are fitted to each other and means for rotating both of said modulators about the common vertical axis at different relative speed to each other so that the low-inertia detector is exposed to the average electromagnetic radiation from the entire hemisphere which is measured over time.
Claim 3
Dependent Claim
14 words
The system as set forth in claim 1, wherein said modulators are similarly designed.
Claim 4
Dependent Claim
14 words
The system as set forth in claim 1, wherein said modulators are differently designed.
Claim 5
Dependent Claim
26 words
The system as set forth in claim 1, including means for rotating said modulators in opposite directions about the common vertical axis at the same speed.
Claim 6
Dependent Claim
26 words
The system as set forth in claim 1, including means for rotating said modulators in opposite directions about the common vertical axis at a different speed.
Claim 7
Dependent Claim
55 words
The system as set forth in claim 1, wherein each of said modulators in the shape of dome segments comprises two equal-sized wing like sections of spherical bi-angles arranged diametrically on an assumed spherical surface, said sections correspond to sectors on the surface of spherical cones having identical angles and being of a black color.
Claim 8
Dependent Claim
15 words
The system as set forth in claim 6, wherein said identical inner angles are 90°.
Claim 9
Dependent Claim
24 words
The system as set forth in claim 1, wherein said modulators in the form of dome segments show a defined wave length dependent reflectivity.
Claim 10
Dependent Claim
24 words
The system as set forth in claim 1, wherein said modulators in the form of dome segments show a defined wave length dependent transmissivity.
Claim 11
Dependent Claim
26 words
The system as set forth in claim 1, wherein said modulators in the form of dome segments show a defined wave length dependent reflectivity and transmissivity.
Claim 12
Dependent Claim
26 words
The system as set forth in claim 1, wherein said modulators in the form of dome segments are provided with means for measuring the temperature thereof.
Claim 13
Dependent Claim
26 words
The system as set forth in claim 1, wherein the space below said dome accommodating the low-inertia detector is hermetically sealed so as to be gas-tight.
Claim 14
Dependent Claim
18 words
The system as set forth in claim 1, including means for rotating said modulators in the same direction.
Claim 15
Dependent Claim
17 words
The system as set forth in claim 1, including means for rotating said modulators in opposite directions.
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) | 1993-05-21 | 1993-11-20 | 1994-05-22 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1997-05-21 | 1997-11-20 | 1998-05-22 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 2001-05-21 | 2001-11-20 | 2002-05-22 | $7700.00 | Window Closed / Lapsed |