Patent US2353334A successfully refreshed from Google Patents.
Patent US1961636A successfully refreshed from Google Patents.
Patent US4527619A successfully refreshed from Google Patents.
US4527619A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Exoatmospheric calibration sphere
Assignee: United States Department of the Army
•
Filing: 1984-07-30
•
Granted: 1985-07-09
•
Expires: 2004-07-30
Abstract
Abstract A sphere which provides a high emissivity, uniform, isothermal calibrationource which is fully instrumented for surface temperature and range measurements. The characteristics are achieved by using high thermal conductivity copper hemispheres disposed in spaced, concentric relation and containing a distributed heat pipe therebetween to minimize surface temperature gradients.
Inventors
- 👤 Francis R. Cartier
- 👤 David N. Stager
- 👤 Roy M. Acker
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-01 14:38
CPC Classifications
G; G01; G01S; G01S7/00; G01S7/48; G01S7/497
Claims Analysis
Total Claims: 10
Claim 1
Independent Claim
67 words
A space-based calibration source including support electronics for medium-wave and long-wave infrared sensors having electronics therein for providing range measurements and surface temperature measurements comprising: a. a pair of spherical members disposed in substantially concentric, spaced relation to form an annular space therebetween; and b. heat pipe means disposed in said annular space forming an integral, bi-directional structure for minimizing surface temperature gradients on said calibration source.
Claim 2
Dependent Claim
67 words
A space-based calibration source including support electronics for medium-wave and long-wave infrared sensors having electronics therein for providing range measurements and surface temperature measurements comprising: a. a pair of spherical members disposed in substantially concentric, spaced relation to form an annular space therebetween; and b. heat pipe means disposed in said annular space forming an integral, bi-directional structure for minimizing surface temperature gradients on said calibration source.
Claim 3
Dependent Claim
34 words
A space-based calibration source as in claim 1 wherein said heat pipe means includes wire wick meshing disposed on the outer surface of said inner sphere and the inner surface of said outer sphere.
Claim 4
Dependent Claim
19 words
A space-based calibration source as in claim 2 including a heat pipe working fluid disposed in said annular space.
Claim 5
Dependent Claim
15 words
A space-based calibration source as in claim 3 wherein said inner sphere is hermetically sealed.
Claim 6
Dependent Claim
35 words
A space-based calibration source as in claim 4 including a pair of support members disposed between each of said spheres for secured relation therebetween, said support members also being covered with said wire wick meshing.
Claim 7
Dependent Claim
27 words
A space-based calibration source as in claim 5 including a pair of openings through said spheres to receive a transmitting antenna and a receiving antenna respectively therein.
Claim 8
Dependent Claim
16 words
A space-based calibration source as in claim 6 wherein said heat pipe working material is methanol.
Claim 9
Dependent Claim
13 words
A space-based calibration source as in claim 7 wherein said spheres are copper.
Claim 10
Dependent Claim
16 words
A space-based calibration source as in claim 8 that provides a known surface temperature and range.
References Cited (Backward Citations)
US3152774A
Cited
US3490718A
Cited
US3535543A
Cited
US3548930A
Cited
US3675711A
Cited
US3620298A
Cited
US3714981A
Cited
US3847208A
Cited
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1988-07-08 | 1989-01-07 | 1989-07-09 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-07-08 | 1993-01-07 | 1993-07-09 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-07-08 | 1997-01-07 | 1997-07-09 | $7700.00 | Window Closed / Lapsed |