US3706938A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Directional ion anemometer
Assignee: United States Department of the Army
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Filing: 1971-03-10
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Granted: 1972-12-19
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Expires: 1991-03-10
Abstract
Abstract This disclosure relates to anemometers and particularly to ion anemometers. More particularly, this disclosure relates to a directional, ion anemometer where an alpha nuclear radiation source is positioned between two electrodes of opposing polarity in a balanced electrical field. The ion cloud concentration generated by the radiation source is changed by motion of the air to cause a differential voltage or current, between the source and the electrodes, proportional to the wind velocity.
Inventors
- 👤 Andrew Petriw
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-30 06:14
CPC Classifications
H; H01; H01J; H01J41/00; H01J41/02; H01J41/08; G; G01; G01P; G01P5/00; G01P5/005; G01P5/006
Claims Analysis
Total Claims: 2
Claim 1
Independent Claim
220 words
An ion anemometer comprising an alpha nuclear radiation source material; a first wind-permeable electrode forming a metallic ring of a first diameter; a second wind-permeable electrode forming a metallic screen of a second, substantiallylarger diameter, positioned on one side of said first electrode; a third wind-permeable electrode forming a metallic screen of said second diameter, positioned on the other side of said first electrode; a source of positive voltage with respect to ground connected to said second electrode; a source of negative voltage with respect to ground connected to said third electrode; a fourth electrode in the form of a metallic ring of a third diameter larger than said first diameter, said fourth electrode being positioned concentric to said first electrode; an electrical sensor in the form of a difference amplifier having a noninverting input connected to said first electrode, and an inverting input connected to said fourth electrode; a fifth electrode of a fourth diameter connected to a tap on said source of positive voltage; and a sixth electrode of said fourth diameter connected to a tap on said source of negative voltage; said fifth and sixth electrodes being coated with said alpha nuclear radiation source material and positioned adjacent to and outside of said second and third electrodes respectively; said fourth diameter being less than said second diameter.
Claim 2
Dependent Claim
220 words
An ion anemometer comprising an alpha nuclear radiation source material; a first wind-permeable electrode forming a metallic ring of a first diameter; a second wind-permeable electrode forming a metallic screen of a second, substantiallylarger diameter, positioned on one side of said first electrode; a third wind-permeable electrode forming a metallic screen of said second diameter, positioned on the other side of said first electrode; a source of positive voltage with respect to ground connected to said second electrode; a source of negative voltage with respect to ground connected to said third electrode; a fourth electrode in the form of a metallic ring of a third diameter larger than said first diameter, said fourth electrode being positioned concentric to said first electrode; an electrical sensor in the form of a difference amplifier having a noninverting input connected to said first electrode, and an inverting input connected to said fourth electrode; a fifth electrode of a fourth diameter connected to a tap on said source of positive voltage; and a sixth electrode of said fourth diameter connected to a tap on said source of negative voltage; said fifth and sixth electrodes being coated with said alpha nuclear radiation source material and positioned adjacent to and outside of said second and third electrodes respectively; said fourth diameter being less than said second diameter.
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) | 1975-12-19 | 1976-06-19 | 1976-12-19 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1979-12-19 | 1980-06-19 | 1980-12-19 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1983-12-19 | 1984-06-19 | 1984-12-19 | $7700.00 | Window Closed / Lapsed |