Patent US2930950A successfully refreshed from Google Patents.
US3842276A
Expired / Lapsed
US
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Thermal radiation detector
Assignee: RCA Corp
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Filing: 1973-06-15
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Granted: 1974-10-15
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Expires: 1993-06-15
Abstract
Abstract A sheet of a pyroelectric material has a separate set of spaced, metal film electrodes on each of its opposed surfaces. Each of the electrodes of one of the sets overlaps two electrodes of the other set so as to form in the sheet a plurality of thermal sensitive elements which are electrically connected in a series path along the sheet. By uniformly polarizing the sheet in a single direction and combining it with a grating, the voltage response of the series path of the thermal sensitive elements is sensitive to the moving warm body but is substantially insensitive to changes in the ambient temperature. By polarizing the sheet so that adjacent elements are polarized in alternating opposite directions, the device is sensitive to changes in the ambient temperature.
Inventors
- 👤 P Southgate
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 10:57
CPC Classifications
G; G01; G01J; G01J5/00; G01J5/10; G01J5/34; G01P; G01P13/00; G08; G08B; G08B13/00; G08B13/18; G08B13/189; G08B13/19; G08B13/191; H; H10; H10N; H10N15/00; H10N15/10
Claims Analysis
Total Claims: 8
Claim 1
Independent Claim
97 words
A radiation detector comprising a body of a radiationsensitive, homogeneous material having a pair of opposed surfaces, a first set of spaced electrodes on one of said opposed surfaces, a second set of spaced electrodes on the other of said opposed surfaces, each of the electrodes of one of said sets overlapping two electrodes of the other of said sets, with each pair of overlapping electrodes forming an individual detector element in said body with all of said individual detector elements being connected in a series arrangement between said sets of electrodes through and along said body.
Claim 2
Dependent Claim
97 words
A radiation detector comprising a body of a radiationsensitive, homogeneous material having a pair of opposed surfaces, a first set of spaced electrodes on one of said opposed surfaces, a second set of spaced electrodes on the other of said opposed surfaces, each of the electrodes of one of said sets overlapping two electrodes of the other of said sets, with each pair of overlapping electrodes forming an individual detector element in said body with all of said individual detector elements being connected in a series arrangement between said sets of electrodes through and along said body.
Claim 3
Dependent Claim
29 words
A radiation detector in accordance with claim 1 in which the number of electrodes in each set is sufficient to provide an even number of the individual detector elements.
Claim 4
Dependent Claim
21 words
A radiation detector in accordance with claim 1 in which the body is polarized in a uniform direction between said surfaces.
Claim 5
Dependent Claim
42 words
A radiation detector in accordance with claim 3 including a grating extending parallel to but being spaced from one of said surfaces of the body, said grating including a plurality of spaced bars which extend parallel to the electrodes on said body.
Claim 6
Dependent Claim
42 words
A radiation detector in accordance with claim 4 in which the bars of the grating are each of a width equal to the width of the detector elements and are spaced apart a distance equal to the width of the detector elements.
Claim 7
Dependent Claim
28 words
A radiation detector in accordance with claim 5 in which at least one of the adjaCent bars of the grating extend across alternate ones of the detector elements.
Claim 8
Dependent Claim
33 words
A radiation detector in accordance with claim 1 in which the body is polarized so that alternate ones of the detector elements are polarized in opposite directions between said surfaces of the body.
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) | 1977-10-14 | 1978-04-15 | 1978-10-15 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-10-14 | 1982-04-15 | 1982-10-15 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-10-14 | 1986-04-15 | 1986-10-15 | $7700.00 | Window Closed / Lapsed |