US3771005A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Omnidirectional ultraviolet radiation detector
Assignee: Honeywell Inc
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Filing: 1971-10-12
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Granted: 1973-11-06
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Expires: 1991-10-12
Abstract
Abstract An ultraviolet sensitive gaseous discharge detector has essentially uniform angular sensitivity in a plane perpendicular to the axis of the detector tube and in the plane of the detector tube axis. The cathode of the detector is in the form of a thin sputtered layer of metal adhering to the inner wall of the envelope of the detector.
Inventors
- 👤 C Erickson
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 19:34
CPC Classifications
H; H01; H01J; H01J47/00; H01J47/08; H01J1/00; H01J1/02; H01J1/34; H01J17/00; H01J17/38; H01J17/40; H01J2201/00; H01J2201/34; H01J2201/342; H01J2201/3421; H01J2201/3425; H01J2893/00; H01J2893/0064; H01J2893/0065; H01J2893/0067
Claims Analysis
Total Claims: 9
Claim 1
Independent Claim
169 words
An ultraviolet radiation detector of the photoelectron triggered gaseous discharge type for detecting ultraviolet radiation of wavelengths between about 2,000 A. and about 3,000 A., the ultraviolet radiation detector compriSing: a gas tight transparent envelope, a photoemissive cathode in the form of a thin layer of metal covering a substantial portion of the inner wall of the envelope, the metal being capable of absorbing ultraviolet radiation and emitting photoelectrons, the thin layer having a thickness which is less than three times the longer of the absorption length of a photon of wavelength between 2,000 A. and 3,000 A. in the metal and the attenuation length of the photoelectron in the metal, cathode contact means extending through the transparent envelope and making electrical contact with the cathode, thereby providing external electrical contact to the cathode, a metal anode coaxially aligned with the envelope and extending through the envelope to provide external electrical contact, the metal anode being spaced from the cathode, and an ionizable gaseous filling contained in the envelope.
Claim 2
Dependent Claim
169 words
An ultraviolet radiation detector of the photoelectron triggered gaseous discharge type for detecting ultraviolet radiation of wavelengths between about 2,000 A. and about 3,000 A., the ultraviolet radiation detector compriSing: a gas tight transparent envelope, a photoemissive cathode in the form of a thin layer of metal covering a substantial portion of the inner wall of the envelope, the metal being capable of absorbing ultraviolet radiation and emitting photoelectrons, the thin layer having a thickness which is less than three times the longer of the absorption length of a photon of wavelength between 2,000 A. and 3,000 A. in the metal and the attenuation length of the photoelectron in the metal, cathode contact means extending through the transparent envelope and making electrical contact with the cathode, thereby providing external electrical contact to the cathode, a metal anode coaxially aligned with the envelope and extending through the envelope to provide external electrical contact, the metal anode being spaced from the cathode, and an ionizable gaseous filling contained in the envelope.
Claim 3
Dependent Claim
45 words
The ultraviolet radiation detector of claim 1 wherein the thin layer forming the cathode has a thickness of between the absorption of a photon of wavelength between 2,000 A. and 3,000 A. in the metal and the attenuation length of a photoelectron in the metal.
Claim 4
Dependent Claim
22 words
The ultraviolet radiation detector of claim 1 wherein the thin layer forming the cathode is copper of thickness less than 500 A.
Claim 5
Dependent Claim
26 words
The ultraviolet radiation detector of claim 3 wherein the thin layer forming the cathode has a thickness of between about 50 A and about 200 A.
Claim 6
Dependent Claim
37 words
The ultraviolet radiation detector of claim 1 wherein the cathode contact means comprises a first metal pin extending into the envelope, the end of the first metal pin being flush with the inner wall of the envelope.
Claim 7
Dependent Claim
38 words
The ultraviolet radiation detector of claim 5 wherein the cathode contact means further comprises a second metal pin extending into the envelope, the end of the second metal pin being flush with the inner wall of the envelope.
Claim 8
Dependent Claim
19 words
The ultraviolet radiation detector of claim 1 wherein the ionizable gaseous filling comprises a hydrogen and neon gas mixture.
Claim 9
Dependent Claim
21 words
The ultraviolet radiation detector of claim 1 wherein the thin layer forming the cathode comprises metal sputtered from the metal anode.
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) | 1976-11-05 | 1977-05-07 | 1977-11-06 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1980-11-05 | 1981-05-07 | 1981-11-06 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1984-11-05 | 1985-05-07 | 1985-11-06 | $7700.00 | Window Closed / Lapsed |