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US3826918A
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Radiation-measuring instrument with surfaces shielded against contamination
Assignee: REACTOR CENTRUM NL
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Filing: 1971-09-28
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Granted: 1974-07-30
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Expires: 1991-09-28
Abstract
Abstract Instruments for measurement of electromagnetic and/or corpuscular radiation in fluid media are liable to be contaminated by deposition of material from the fluid. The contamination of detectors, radiation sources or other vital surfaces in radiation measurement instruments is prevented by placing a porous window before the surfaces threatened by contamination and flowing a purging fluid through the porous window.
Inventors
- 👤 Der Koogh G Van
- 👤 A Bernards
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-25 07:54
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/02; G01N23/06; G01N23/12; G01T; G01T7/00; G01T7/02
Claims Analysis
Total Claims: 7
Claim 1
Independent Claim
78 words
A measuring device for the measurement of radiation of the electromagnetic or corpuscular type comprising: at least one vessel for containing a fluid having a wall made at least partially from porous material permeable to radiation; at least one detection device mounted adjacent and external of the porous wall; and means for pressing a protective fluid through the partly porous walls into said vessel to produce a protective fluid layer along the inner surface of the porous wall.
Claim 2
Dependent Claim
78 words
A measuring device for the measurement of radiation of the electromagnetic or corpuscular type comprising: at least one vessel for containing a fluid having a wall made at least partially from porous material permeable to radiation; at least one detection device mounted adjacent and external of the porous wall; and means for pressing a protective fluid through the partly porous walls into said vessel to produce a protective fluid layer along the inner surface of the porous wall.
Claim 3
Dependent Claim
20 words
A measuring device according to claim 1, wherein the detection device is mounted on the external walls of the vessel.
Claim 4
Dependent Claim
84 words
A measuring device according to claim 1, including a plurality of said vessels each having a porous wall and each having inlet and outlet ducts for the fluid to be measured, a plurality of detection devices centrally positioned with respect to said vessels, said means for pressing the protective fluid including a non-porous housing surrounding said vessels and said detectors, and an inlet duct for introducing the protective fluid into the non-porous housing so as to press the protective fluid through the porous walls.
Claim 5
Dependent Claim
109 words
A measuring device according to claim 1, wherein the detection device is positioned inside a first porous wall so as to define therebetween a clearance, a second porous wall surrounding the first porous wall to define an intervening space, said means for pressing the protective fluid including a non-porous wall surrounding the second porous wall with a space therebetween, the intervening space between the first and second porous walls defining a duct for the fluid to be measured, the clearance between the detection device and the first porous wall and the space between the non-porous wall and the second porous wall defining a passage means for the protective fluid.
Claim 6
Dependent Claim
32 words
A measuring device according to claim 1, wherein there is an additional detecting device mounted on the outer side of the porous wall that detects properties other than electromagnetic or corpuscular radiation.
Claim 7
Dependent Claim
14 words
A measuring device according to claim 5, wherein the additional detecting device detects smoke.
References Cited (Backward Citations)
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US3015729A
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US3110803A
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US3180990A
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US3508047A
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US3649829A
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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) | 1977-07-29 | 1978-01-28 | 1978-07-30 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-07-29 | 1982-01-28 | 1982-07-30 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-07-29 | 1986-01-28 | 1986-07-30 | $7700.00 | Window Closed / Lapsed |