US3614445A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Measuring width variations of a moving sheet by the use of beta-rays
Assignee: Nederlandse Organisatie voor Toegepast Natuurwetenschappelijk Onderzoek TNO
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Filing: 1969-09-15
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Granted: 1971-10-19
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Expires: 1989-09-15
Abstract
Abstract A device is described for measuring the variation in width of a moving sheet of material comprising two substantially identical sources of Beta rays positioned above the edges of the sheet and preferably one elongated ionization chamber positioned below the sheet. An electrical scheme is shown which comprises a differential amplifier.
Inventors
- 👤 Paul Platzek
- 👤 Gerardus Van Kempen
- 👤 Dominicus Ros
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-09 07:28
CPC Classifications
G; G01; G01N; G01N23/00; G01N23/02; G01N23/06; G01N23/16
Claims Analysis
Total Claims: 6
Claim 1
Independent Claim
155 words
A device for contactless measuring of width variations of a moving at least partially transparent sheet comprising two substantially identical sources of ionization radiation positioned above the edges of a moving sheet of material, means for detecting ionization radiation positioned below the moving sheet and means for measuring the total amount of radiation not Absorbed by the moving sheet of material, said sources of ionization radiation and said means for detecting ionization radiation being positioned with respect to the moving sheet in such a manner that the radiation emanating from said sources hits said means for detecting ionization radiation at both edges of the moving sheet even at the largest possible variation of position, and a part of said means for detecting ionization radiation is always screened by the moving sheet during the measurement, said ionization radiation being weak beta rays from a member of the group consisting of carbon-14, promethium-147, . krypton-85 and yttrium-90.
Claim 2
Independent Claim
155 words
A device for contactless measuring of width variations of a moving at least partially transparent sheet comprising two substantially identical sources of ionization radiation positioned above the edges of a moving sheet of material, means for detecting ionization radiation positioned below the moving sheet and means for measuring the total amount of radiation not Absorbed by the moving sheet of material, said sources of ionization radiation and said means for detecting ionization radiation being positioned with respect to the moving sheet in such a manner that the radiation emanating from said sources hits said means for detecting ionization radiation at both edges of the moving sheet even at the largest possible variation of position, and a part of said means for detecting ionization radiation is always screened by the moving sheet during the measurement, said ionization radiation being weak beta rays from a member of the group consisting of carbon-14, promethium-147, . krypton-85 and yttrium-90.
Claim 3
Dependent Claim
17 words
A device of claim 1 wherein a single, elongated ionization chamber is used as the detecting device.
Claim 4
Dependent Claim
32 words
A device of claim 1 wherein the ionization chamber is provided with two substantially equally shaped and equivalent windows for transmission of the ionizing radiation passing the edges of the moving sheet.
Claim 5
Dependent Claim
23 words
A device of claim 1 wherein two detectors connected in parallel are the detecting means, each detector having homogenous and equally shaped windows.
Claim 6
Dependent Claim
12 words
A device of claim 1 wherein the beta rays are from carbon-14.
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) | 1974-10-18 | 1975-04-19 | 1975-10-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1978-10-18 | 1979-04-19 | 1979-10-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1982-10-18 | 1983-04-19 | 1983-10-19 | $7700.00 | Window Closed / Lapsed |