US3867688A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electrodeless conductance measurement device
Assignee: United States Atomic Energy Commission
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Filing: 1973-12-18
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Granted: 1975-02-18
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Expires: 1993-12-18
Abstract
Abstract A device is provided for electrodeless measurement of the conductance of a material. A damped oscillatory signal is applied to the primary winding of a first transformer ring core. A current loop, including as part of its path the material and carrying a current in response to a signal of the primary winding, couples the first core to a second transformer ring core by acting as a secondary winding for the first core and as a primary winding for the second core. The peak current in a secondary winding of the second core due to and corresponding to the current in the loop and the peak voltage across the loop, which is constant for all materials at the instant the damped oscillatory signal is applied to the primary winding, gives the conductance of the loop.
Inventors
- 👤 Oscar H Koski
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-11-03 10:24
CPC Classifications
G; G01; G01N; G01N27/00; G01N27/02; G01N27/023; G01R; G01R27/00; G01R27/02; G01R27/22
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
243 words
A device for inducing a peak voltage across and a peak current in a material so that the conductance G of the material may be determined, comprising: a first transformer ring core having a Primary winding of n turns thereabout, means for applying at time 0 a first damped oscillatory voltage of peak value eI across said primary winding of said first core, said peak value eI occurring the instant after time 0, a current loop including the material for at least a portion of said current loop, said current loop being positioned to pass through said first core, thereby acting as a secondary winding for said first core so that in response to said first damped oscillatory voltage a first damped oscillatory current is induced in said current loop and a second damped oscillatory voltage appears across said current loop of peak value eL eI/n, said peak value eL occurring the instant after time 0, a second transformer ring core having a secondary winding thereabout, said current loop being positioned to pass through said second core, thereby acting as a primary winding for said second core so that in response to said first damped oscillatory current in said current looped a second damped oscillatory current of peak value iP is induced in said secondary winding of said second core, and means for measuring iP coupled to said secondary winding of said second core, with the conductance of said material being G iP/eL.
Claim 2
Independent Claim
243 words
A device for inducing a peak voltage across and a peak current in a material so that the conductance G of the material may be determined, comprising: a first transformer ring core having a Primary winding of n turns thereabout, means for applying at time 0 a first damped oscillatory voltage of peak value eI across said primary winding of said first core, said peak value eI occurring the instant after time 0, a current loop including the material for at least a portion of said current loop, said current loop being positioned to pass through said first core, thereby acting as a secondary winding for said first core so that in response to said first damped oscillatory voltage a first damped oscillatory current is induced in said current loop and a second damped oscillatory voltage appears across said current loop of peak value eL eI/n, said peak value eL occurring the instant after time 0, a second transformer ring core having a secondary winding thereabout, said current loop being positioned to pass through said second core, thereby acting as a primary winding for said second core so that in response to said first damped oscillatory current in said current looped a second damped oscillatory current of peak value iP is induced in said secondary winding of said second core, and means for measuring iP coupled to said secondary winding of said second core, with the conductance of said material being G iP/eL.
Claim 3
Dependent Claim
123 words
The device of claim 1 wherein said means for applying a damped oscillatory voltage includes a capacitor, a switch having two positions, and a voltage supply, with said switch in a first position said voltage supply being coupled in series with said capacitor and said primary winding of said first core thereby charging said capacitor, with said switch in a second position said capacitor being coupled in series with said primary winding of said first core to allow discharge of said capacitor so that a damped oscillatory voltage appears across said primary winding of said first core due to the RLC circuit effected by the series coupling of said capacitor and said primary winding of said first core and the inherent resistance thereof.
Claim 4
Dependent Claim
26 words
The device of claim 2 wherein said current loop includes a conduit and the material is in the form of a fluid contained in said conduit.
Claim 5
Dependent Claim
18 words
The device of claim 3 wherein said fluid contained in said conduit is a solution including nitric acid.
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) | 1978-02-17 | 1978-08-19 | 1979-02-18 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1982-02-17 | 1982-08-19 | 1983-02-18 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1986-02-17 | 1986-08-19 | 1987-02-18 | $7700.00 | Window Closed / Lapsed |