US3641439A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Near-field radiation monitor
Assignee: Narda Microwave Corp
•
Filing: 1969-08-08
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Granted: 1972-02-08
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Expires: 1989-08-08
Abstract
Abstract A probe having a pair of thin film thermocouples positioned in quadrature functions as both an antenna and detector. The thermocouple elements develop a voltage commensurate with the radiofrequency power of the impinging field and this voltage is then used to drive a meter element and display a quantity directly readable as radiofrequency power.
Inventors
- 👤 Edward E Aslan
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 13:01
CPC Classifications
G; G01; G01R; G01R29/00; G01R29/08; G01R29/0864; G01R29/0878
Claims Analysis
Total Claims: 13
Claim 1
Independent Claim
118 words
A radiation detector comprising antenna means operative in response to an electric field to produce an electric current, including thermally and electrically conductive films forming a dipole; and a thin film thermocouple connected as a load to said antenna means, the hot junction of said thermocouple being formed by overlapping end portions of thin resistive strips of dissimilar metal films having a thickness that is small relative to the skin depth of the wave energy of said electric field, and the cold junctions of said thermocouple being formed by Overlapping the other end portions of said thin resistive strips with said thermally and electrically conductive films; said thermocouple and said antenna means being substantially disposed within a plane.
Claim 2
Dependent Claim
118 words
A radiation detector comprising antenna means operative in response to an electric field to produce an electric current, including thermally and electrically conductive films forming a dipole; and a thin film thermocouple connected as a load to said antenna means, the hot junction of said thermocouple being formed by overlapping end portions of thin resistive strips of dissimilar metal films having a thickness that is small relative to the skin depth of the wave energy of said electric field, and the cold junctions of said thermocouple being formed by Overlapping the other end portions of said thin resistive strips with said thermally and electrically conductive films; said thermocouple and said antenna means being substantially disposed within a plane.
Claim 3
Dependent Claim
36 words
A radiation detector according to claim 1, wherein said conductive films forming a dipole are a small fraction of a wavelength from end to end for the midfrequency of the range of frequencies to be detected.
Claim 4
Dependent Claim
69 words
A radiation detector according to claim 1, comprising second antenna means operative in response to an electric field to produce an electric current, and a second thin film thermocouple connected as a load to said antenna means and effecting cold junctions at the points of connection, said second antenna means and second thermocouple being disposed it right angles to the first-mentioned antenna and thermocouple and substantially within said plane.
Claim 5
Dependent Claim
23 words
A radiation detector according to claim 1, including means coupling said thermocouple to a meter responsive to the amount of voltage generated therein.
Claim 6
Dependent Claim
24 words
A radiation detector according to claim 24, wherein said means coupling the thermocouple to said meter are positioned substantially orthogonally to said conductive films.
Claim 7
Dependent Claim
26 words
A radiation detector according to claim 5, wherein said means coupling the thermocouple to said meter include bypass capacitors located approximately one-half wavelength from said thermocouples.
Claim 8
Dependent Claim
46 words
A radiation detector according to claim 5, wherein said thermocouple element is mounted at the end of elongated means and including connecting means at said end for securing additional conductive means in electrical contact with each of said first mentioned conductive films and being aligned therewith.
Claim 9
Dependent Claim
50 words
A radiation detector as defined in claim 1, including nonperturbing means for introducing said antenna means and thermocouple into the near-field region of said electric field, said nonperturbing means being substantially parallel to the direction of field propagation when said thermocouple and antenna means are aligned with said electric field.
Claim 10
Dependent Claim
34 words
A radiation detector as defined in claim 1, including spacing means of predetermined length and having free space characteristics, adapted to be interposed between said antenna means and the source of said electric field.
Claim 11
Dependent Claim
18 words
A radiation detector as defined in claim 9, wherein said antenna means are mounted on said spacing means.
Claim 12
Dependent Claim
37 words
A radiation detector as defined in claim 10, wherein said spacing means and said antenna means are mounted on a unit of predetermined length wherein connections are made to said antenna means via conductors maintained perpendicular thereto.
Claim 13
Dependent Claim
50 words
A radiation detector as defined in claim 10, wherein said spacing means is removably connected to said detector and including further spacing means having free space characteristics connectable to said detector, and further means mounted on said further spacing means adapted to respond to an electric field of different frequency.
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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) | 1975-02-07 | 1975-08-09 | 1976-02-08 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-02-07 | 1979-08-09 | 1980-02-08 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-02-07 | 1983-08-09 | 1984-02-08 | $7700.00 | Window Closed / Lapsed |