US3812422A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Apparatus for measuring the levels of fluids and the dielectric constants of the same
Assignee: National Agency for New Technologies, Energy and Sustainable Economic Development
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Filing: 1972-08-28
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Granted: 1974-05-21
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Expires: 1992-08-28
Abstract
Abstract A device is herein disclosed for measuring the changes of impedance along the path of an electric signal. More specifically, according to this invention the changes of impedance along a coaxial cable connected to a pulse generator are measured and through such measures the distances are measured between a reference point along the cable and the points where the the changes of impedance occur. Particularly this invention relates to a device for accurately determining the interfaces level between liquid masses and the dielectric constants of said liquids.
Inventors
- 👤 Carolis M De
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-23 23:47
CPC Classifications
G; G01; G01F; G01F23/00; G01F23/22; G01F23/28; G01F23/284
Claims Analysis
Total Claims: 5
Claim 1
Independent Claim
164 words
A device for measuring the levels of fluid masses and more specifically the levels of interfaces between fluids of different dielectric constants which device comprises a probe made to two spaced cylindrical coaxial rigid conductors with vertical axis which probe is connected by means of a coaxial cable affixed at the upper end of the probe to a generator of pulses in the range of GHz frequencies and to an instrument for measuring the time intervals between the instant when each of said pulses originates from said generator and the instant when it returns to said instrument after being reflected by said interfaces in which device the two probe conductors are connected to one another at the lower ends thereof by means of a conducting element of low resistance such that a short circuit is established thereby for the electrochemical currents which originate across said two elements due to the presence between them of the fluids of which the levels are to be measured.
Claim 2
Independent Claim
164 words
A device for measuring the levels of fluid masses and more specifically the levels of interfaces between fluids of different dielectric constants which device comprises a probe made to two spaced cylindrical coaxial rigid conductors with vertical axis which probe is connected by means of a coaxial cable affixed at the upper end of the probe to a generator of pulses in the range of GHz frequencies and to an instrument for measuring the time intervals between the instant when each of said pulses originates from said generator and the instant when it returns to said instrument after being reflected by said interfaces in which device the two probe conductors are connected to one another at the lower ends thereof by means of a conducting element of low resistance such that a short circuit is established thereby for the electrochemical currents which originate across said two elements due to the presence between them of the fluids of which the levels are to be measured.
Claim 3
Dependent Claim
88 words
A device for measuring the levels of fluids as per claim 1, characterized by the fact that said conducting element of low resistance comprises a metal plug inserted between the two cylindrical coaxial conductors at the lower end thereof which metal plug is provided with a crown of bores of which the axes are parallel to the probe with the purpose of draining from the space between said elements any liquid when the probe is withdrawn from the vessel in which the liquids to be measured are contained.
Claim 4
Dependent Claim
56 words
A probe for measuring the levels of fluids as per claim 1, characterized by the fact that the outer cylindrical conductor of said probe is provided with perforations regularly distrubuted over that section of the probe which extends between the lowermost and the uppermost levels to be presumably reached by the liquid interface to be measured.
Claim 5
Dependent Claim
53 words
A probe for measuring the levels of fluids as per claim 3 characterized by the fact that above the perforated section of the outer cylindrical conductor, a means is provided for closing the space between said two probe conductors and for centering the inner conductor of the probe within the outer conductor thereof.
References Cited (Backward Citations)
No citation records indexed.
USPTO Annuity & Maintenance Windows
| Annuity Stage | Window Opens | Payment Deadline | Surcharge Period Until | Estimated Fee | Status |
|---|---|---|---|---|---|
| 3.5 Years (Year 4) | 1977-05-20 | 1977-11-19 | 1978-05-21 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1981-05-20 | 1981-11-19 | 1982-05-21 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1985-05-20 | 1985-11-19 | 1986-05-21 | $7700.00 | Window Closed / Lapsed |