US4518912A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Radiation detector
Assignee: Lockheed Martin Corp
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Filing: 1978-04-05
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Granted: 1985-05-21
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Expires: 1998-04-05
Abstract
Abstract A radiation detector utilizing thin film thermocouples serially connected in an array and substantially disposed within a plane, said thermocouples being selectively mounted for non-perturbing introduction into the near-field region of an electric field. This application is a continuation of copending application Ser. No. 678,901 filed Apr. 21, 1976, now abandoned, which prior application was a continuation of previously copending application Ser. No. 423,754 filed Dec. 11, 1973, now abandoned, which latter application was a divisional of copending application Ser. No. 200,536, filed Nov. 19, 1971, now U.S. Pat. No. 3,794,914, which latter application was a continuation-in-part of copending application Ser. No. 848,620 filed Aug. 8, 1969, now U.S. Pat. No. 3,641,439.
Inventors
- 👤 Edward E. Aslan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-02 08:02
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/08; G01R29/0864; G01R29/0878
Claims Analysis
Total Claims: 4
Claim 1
Independent Claim
135 words
A radiation detector comprising a sensor assembly mounted at one end of an elongated handle, said sensor assembly including first metallic films for converting free space electromagnetic radiation into direct current voltage, said films including overlapping films forming hot and cold thermocouple junctions, said overlapping films including thin films of dissimilar metals, said thin films being resistive and converting alternating currents induced by said radiation into thermal energy, the hot and cold junctions of said films having electrical and thermal conductivities selected to cause said alternating currents to heat said hot junction to a higher temperature than said cold junction and produce said direct current voltage, said handle including conductive members aligned with the direction of elongation and electrically connected to said thermocouples thereby to provide said direct current voltage to a voltage measuring apparatus.
Claim 2
Dependent Claim
135 words
A radiation detector comprising a sensor assembly mounted at one end of an elongated handle, said sensor assembly including first metallic films for converting free space electromagnetic radiation into direct current voltage, said films including overlapping films forming hot and cold thermocouple junctions, said overlapping films including thin films of dissimilar metals, said thin films being resistive and converting alternating currents induced by said radiation into thermal energy, the hot and cold junctions of said films having electrical and thermal conductivities selected to cause said alternating currents to heat said hot junction to a higher temperature than said cold junction and produce said direct current voltage, said handle including conductive members aligned with the direction of elongation and electrically connected to said thermocouples thereby to provide said direct current voltage to a voltage measuring apparatus.
Claim 3
Dependent Claim
23 words
A radiation detector as specified in claim 1 wherein said sensor assembly includes second conductive films, substantially orthogonal to said first conductive films.
Claim 4
Dependent Claim
59 words
A radiation detector as specified in claim 1 or 2 wherein said overlapping films further include highly conductive films, and wherein said hot junction is formed by the overlapping ends of said thin resistive films with each other and wherein said cold junctions are formed by the overlapping ends of said thin resistive films and said highly conductive films.
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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) | 1988-05-20 | 1988-11-19 | 1989-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1992-05-20 | 1992-11-19 | 1993-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1996-05-20 | 1996-11-19 | 1997-05-21 | $7700.00 | Window Closed / Lapsed |