US4761556A
Expired / Lapsed
US
⏱️ 0.0 years remaining
On board receiver
Assignee: Lockheed Martin Corp
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Filing: 1987-12-02
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Granted: 1988-08-02
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Expires: 2007-12-02
Abstract
Abstract An infrared receiver for detecting a communications signal during a fixed reception period in a high noise environment that includes a sensor having a cooled detector mounted upon a substrate upon the end of a cold well tube that further includes a cooling gas tube having a fixed orifice to emit a cooling gas upon the interior surface of the substrate. The receiver further includes a signal processor that receives the detector signals and determines if the detector signals include prdetermined signal characteristics of the communications signal.
Inventors
- 👤 Fynlon G. Simpson
- 👤 Robert L. Fisher
- 👤 James Kissell
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-04 11:47
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/02; G01J5/06; G01J5/061
Claims Analysis
Total Claims: 16
Claim 1
Independent Claim
131 words
A receiver for detecting a communications signal during a fixed reception time period comprising: means for detecting the presence of the communications signal and for generating a detector signal; signal processing means for receiving said detector signal and for providing an indication of reception of the communication signal; a cold well tube; a source of cooling fluid; a fixed orifice cooling gas tube disposed within said cold well tube and connected to said source of cooling fluid; said detecting means being connected to said cold well tube; and valve means connected between said source of cooling fluid and said cooling gas tube for providing cooling fluid under pressure to said cold well tube and said detecting means for a fixed time period which is less than the fixed reception time period.
Claim 2
Dependent Claim
131 words
A receiver for detecting a communications signal during a fixed reception time period comprising: means for detecting the presence of the communications signal and for generating a detector signal; signal processing means for receiving said detector signal and for providing an indication of reception of the communication signal; a cold well tube; a source of cooling fluid; a fixed orifice cooling gas tube disposed within said cold well tube and connected to said source of cooling fluid; said detecting means being connected to said cold well tube; and valve means connected between said source of cooling fluid and said cooling gas tube for providing cooling fluid under pressure to said cold well tube and said detecting means for a fixed time period which is less than the fixed reception time period.
Claim 3
Dependent Claim
36 words
The receiver of claim 1 wherein said detecting means includes: a detector having a surface; a spectral filter and a lens mounted adjacent to said detector for filtering and focusing received signals onto said detector surface.
Claim 4
Dependent Claim
19 words
The receiver of claim 2 wherein said lens is positioned to focus received signals across the entire detector surface.
Claim 5
Dependent Claim
33 words
The receiver of claim 1 wherein said valve means provides cooling fluid to said cold well tube at the beginning of the reception period and ending before the end of the reception period.
Claim 6
Dependent Claim
23 words
The receiver of claim 1 wherein said signal processing means includes a preamplifier circuit for providing a biasing current to said detecting means.
Claim 7
Dependent Claim
19 words
The receiver of claim 5 wherein said signal processing means includes a post amplifier for providing a gain signal.
Claim 8
Dependent Claim
25 words
The receiver of claim 6 wherein said post amplifier includes circuit means for providing a nonlinear response to signals detected within a predetermined frequency bandwidth.
Claim 9
Dependent Claim
165 words
An infrared receiver for detecting a communications signal transmitted during a fixed reception time period comprising: a housing; a cold well tube disposed within said housing; a source of cooling fluid; a fixed orific cooling gas tube disposed within said cold well tube and connected to said source of cooling fluid; a substrate having first and second sides and being mounted to said cold well tube, such that said first side lies adjacent to said gas tube; a detector mounted to said second side of said substrate for detecting the presence of the communications signal within said housing and for generating a detector signal; valve means connected between said source of cooling fluid and said cooling gas tube for providing cooling fluid under pressure to said first side of said substrate for a fixed time period which is less than the fixed reception time period; and signal processing means for receiving said detector signal and for providing an indication of reception of the communication signal.
Claim 10
Dependent Claim
165 words
An infrared receiver for detecting a communications signal transmitted during a fixed reception time period comprising: a housing; a cold well tube disposed within said housing; a source of cooling fluid; a fixed orific cooling gas tube disposed within said cold well tube and connected to said source of cooling fluid; a substrate having first and second sides and being mounted to said cold well tube, such that said first side lies adjacent to said gas tube; a detector mounted to said second side of said substrate for detecting the presence of the communications signal within said housing and for generating a detector signal; valve means connected between said source of cooling fluid and said cooling gas tube for providing cooling fluid under pressure to said first side of said substrate for a fixed time period which is less than the fixed reception time period; and signal processing means for receiving said detector signal and for providing an indication of reception of the communication signal.
Claim 11
Dependent Claim
47 words
The receiver of claim 8 and further including: a prism mounted to said housing for directing received communications signals into said housing; a spectral filter disposed within said housing and adjacent said prism; and a lens disposed within said housing between said spectral filter and said detector.
Claim 12
Dependent Claim
21 words
The receiver of claim 8 wherein said lens is disposed within said housing to focus received signals across the entire detector.
Claim 13
Dependent Claim
33 words
The receiver of claim 8 wherein said valve means provides cooling fluid to said cold well tube at the beginning of the reception period and ending before the end of the reception period.
Claim 14
Dependent Claim
23 words
The receiver of claim 8 wherein said signal processing means includes a preamplifier circuit for providing a biasing current to said detecting means.
Claim 15
Dependent Claim
19 words
The receiver of claim 12 wherein said signal processing means includes a post amplifier for providing a gain signal.
Claim 16
Dependent Claim
25 words
The receiver of claim 13 wherein said post amplifier includes circuit means for providing a nonlinear response to signals detected within a predetermined frequency bandwidth.
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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) | 1991-08-02 | 1992-02-01 | 1992-08-02 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1995-08-02 | 1996-02-01 | 1996-08-02 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1999-08-02 | 2000-02-01 | 2000-08-02 | $7700.00 | Window Closed / Lapsed |