US3793552A
Expired / Lapsed
US
⏱️ 0.0 years remaining
High temperature photoelectric gas multiplication ultraviolet ray sensor
Assignee: General Electric Co
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Filing: 1972-07-19
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Granted: 1974-02-19
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Expires: 1992-07-19
Abstract
Abstract An ultraviolet ray sensor for operating at high temperature includes a gas-filled sealed unit which encloses a photocathode having a spherically-shaped metal crystalline end and a ray collecting means for gathering and focussing incident rays on the photocathode. The sealed unit is made of a ceramic body with one end open to admit ultraviolet rays, that end being sealed by an ultraviolet ray transmissive window, the envelope of this sensor being capable of operating in air without oxidation or release of gas from the inner walls up to temperatures in excess of 600* C.
Inventors
- 👤 H Glascock
- 👤 H Webster
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 13:47
CPC Classifications
H; H01; H01J; H01J47/00
Claims Analysis
Total Claims: 11
Claim 1
Independent Claim
174 words
An ultraviolet ray sensor for operation at high temperatures comprising a inert gas-filled hermetically sealed unit including a active gas gettering base member, a photocathode having a substantially hemispherically shaped crystalline electron emitting surface, an ultraviolet reflecting anode means encircling said photocathode for collecting incident rays and focussing them on said photocathode, said photocathode and said ultraviolet reflecting anode means being supported from said base member in juxtaposition to each other so that ultraviolet radiation incident upon said anode means is focussed upon said substantially hemispherically shaped electron emitting surface, and an ultraviolet transmissive window sealed across the face of said ultraviolet reflecting anode means to admit ultraviolet rays for focussing on said photocathode, said anode means comprising an ultraviolet reflecting member having a curved inner surface of shape effective to receive substantially all ultraviolet radiation incident on said window and focus such radiation on said photocathode, all of the constituents of said sensor comprising materials having high melting points, high resistance to oxidation, and accurately operative at temperatures in excess of 600* C.
Claim 2
Dependent Claim
174 words
An ultraviolet ray sensor for operation at high temperatures comprising a inert gas-filled hermetically sealed unit including a active gas gettering base member, a photocathode having a substantially hemispherically shaped crystalline electron emitting surface, an ultraviolet reflecting anode means encircling said photocathode for collecting incident rays and focussing them on said photocathode, said photocathode and said ultraviolet reflecting anode means being supported from said base member in juxtaposition to each other so that ultraviolet radiation incident upon said anode means is focussed upon said substantially hemispherically shaped electron emitting surface, and an ultraviolet transmissive window sealed across the face of said ultraviolet reflecting anode means to admit ultraviolet rays for focussing on said photocathode, said anode means comprising an ultraviolet reflecting member having a curved inner surface of shape effective to receive substantially all ultraviolet radiation incident on said window and focus such radiation on said photocathode, all of the constituents of said sensor comprising materials having high melting points, high resistance to oxidation, and accurately operative at temperatures in excess of 600* C.
Claim 3
Dependent Claim
40 words
The sensor of claim 1 in which said photocathode comprises a substantially-hemispherically-shaped metal crystalline body having a work function correlated with the ambient radiation to be sensed and operating temperatures of said sensor to maximize electron emission from the photocathode.
Claim 4
Dependent Claim
11 words
The sensor of claim 2 in which said photocathode comprises molybdenum.
Claim 5
Dependent Claim
11 words
The sensor of claim 2 in which said photocathode comprises tungsten.
Claim 6
Dependent Claim
44 words
The sensor of claim 2 in which said ray-collecting means has a central aperture and means for supporting said photocathode extends through said aperture to position said photocathode at approximately the focal point of the curved surface and the point of maximum ultraviolet intensity.
Claim 7
Dependent Claim
41 words
The sensor of claim 2 in which said window has a Central aperture and means for supporting said photocathode extend through said aperture to position said photocathode at approximately the focal point of the curved surface and of maximum light intensity.
Claim 8
Dependent Claim
24 words
The sensor of claim 2 in which said photocathode comprises crystalline molybdenum or tungsten, said window comprises sapphire, and said base member comprises titanium.
Claim 9
Dependent Claim
44 words
The sensor of claim 6 in which a said base member comprises a dish-shaped member which supports said anode member and said window so as to locate said photocathode with the inwardly depending end thereof at the focal point of said reflecting anode surface.
Claim 10
Dependent Claim
21 words
The sensor of claim 8 in which said ray-collecting and focussing anode means comprises a substantially hemispherical molybdenum or nickel spinning.
Claim 11
Dependent Claim
27 words
The sensor of claim 1 in which said sealed unit is filled with a gas or gas mixture and said window is impermeable to said gas filling.
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) | 1977-02-18 | 1977-08-20 | 1978-02-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-02-18 | 1981-08-20 | 1982-02-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-02-18 | 1985-08-20 | 1986-02-19 | $7700.00 | Window Closed / Lapsed |