US4050301A
Expired / Lapsed
US
⏱️ 0.0 years remaining
Electromagnetic water current meter with synthetic direction field
Assignee: Individual
•
Filing: 1976-05-27
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Granted: 1977-09-27
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Expires: 1996-05-27
Abstract
Abstract An electromagnetic water current meter has associated therewith apparatus to provide an artificially generated field having a direction of predetermined orientation relative to a known coordinate system. In addition to the conventional signal processing apparatus associated with the electromagnetic water current meter, additional signal processing apparatus is provided to produce signals related to the orthogonal components of the artificial field relative to the unknown orientation of the transducer. Signal responsive means is provided which responds to the electromagnetic water current outputs, as well as to the signals representative of the orthogonal components of the artificial field to produce output signals representative of the flow velocity in a coordinate system determined by the direction of the artificial field.
Inventors
- 👤 Vincent J. Cushing
Bibliographic Details
Application Number
—
Jurisdiction
US
Data Source
google_patents
Last Synchronized
2026-10-29 02:27
CPC Classifications
G; G01; G01P; G01P5/00; G01P5/08; G01F; G01F1/00; G01F1/56; G01F1/58; G01P13/00; G01P13/02
Claims Analysis
Total Claims: 20
Claim 1
Independent Claim
108 words
A device for producing signals representative of orthogonal flow velocity components with reference to a known coordinate system, including an electromagnetic flow transducer, producing signals representative of orthogonal flow velocity components with reference to an unknown coordinate system, which further includes, an artificial field generator for producing a field with predetermined orientation relative to said known coordinate system, sensing means, integral with said transducer, for sensing orthogonal components of said field in said unknown coordinate system, and producing signals related thereto, signal responsive means, responsive to said transducer-produced signals, and to said sensing means-produced signals for providing signals representative of orthogonal flow velocities in said known coordinate systems.
Claim 2
Independent Claim
108 words
A device for producing signals representative of orthogonal flow velocity components with reference to a known coordinate system, including an electromagnetic flow transducer, producing signals representative of orthogonal flow velocity components with reference to an unknown coordinate system, which further includes, an artificial field generator for producing a field with predetermined orientation relative to said known coordinate system, sensing means, integral with said transducer, for sensing orthogonal components of said field in said unknown coordinate system, and producing signals related thereto, signal responsive means, responsive to said transducer-produced signals, and to said sensing means-produced signals for providing signals representative of orthogonal flow velocities in said known coordinate systems.
Claim 3
Dependent Claim
14 words
The device of claim 1 in which said artificial field is an alternating field.
Claim 4
Dependent Claim
18 words
The device of claim 1 in which said artificial field is an alternating field with zero average amplitude.
Claim 5
Dependent Claim
14 words
The device of claim 1 in which said artificial field is an electric field.
Claim 6
Dependent Claim
18 words
The device of claim 4 in which said electric field is an alternating field with zero average amplitude.
Claim 7
Dependent Claim
32 words
The devide of claim 1 in which said dectromagnetic flow transducer generates an AC magnetic field of one frequency, said artificial field generator operating at a frequency realted to said one frequency.
Claim 8
Dependent Claim
31 words
The device of claim 6 in which said artificial field generator produces an electrical field of zero average amplitude at a frequency which is multiple or sub-multiple of said one frequency.
Claim 9
Dependent Claim
25 words
The device of claim 1 in which said artificial field generator includes a pair of electrodes for generating an electric field of zero average amplitude.
Claim 10
Dependent Claim
23 words
The device of claim 8 in which each said electrode is spaced from another with predetermined orientation relative to said known coordinate system.
Claim 11
Dependent Claim
25 words
The device of claim 9 in which said flow transducer is spaced from one of said electrodes and colinear with a line joining said electrodes.
Claim 12
Dependent Claim
16 words
The device of claim 9 in which said flow transducer is located midway between said electrodes.
Claim 13
Dependent Claim
13 words
The device of claim 9 in which each of said electrodes is cylindrical.
Claim 14
Dependent Claim
29 words
The device of claim 12 in which said flow transducer is spaced from at least one of said electrodes by a distance several times the height of said electrode.
Claim 15
Dependent Claim
26 words
The device of claim 12 in which said flow transducer is sapced from both said electrodes by at least several times the height of said electrodes.
Claim 16
Dependent Claim
15 words
The device of claim 9 in which each of said electrodes is a sheet electrode.
Claim 17
Dependent Claim
15 words
The device of claim 9 in which each of said electrodes is a sheet electrode.
Claim 18
Dependent Claim
32 words
The device of claim 1 in which said electromagnetic flow transducer includes at least a pair of sensing electrodes, and said sensing means includes said at least a pair of sensing electrodes.
Claim 19
Dependent Claim
23 words
The device of claim 17 in which both said electomagnetic flow transducer and said sensing means includes a single set of four electrodes.
Claim 20
Dependent Claim
26 words
The device of claim 17 in which said electromagnetic flow transducer signals are at one frequency and said sensing means produced signals are at another frequency.
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) | 1980-09-26 | 1981-03-28 | 1981-09-27 | $2000.00 | Window Closed / Lapsed |
| 7.5 Years (Year 8) | 1984-09-26 | 1985-03-28 | 1985-09-27 | $3760.00 | Window Closed / Lapsed |
| 11.5 Years (Year 12) | 1988-09-26 | 1989-03-28 | 1989-09-27 | $7700.00 | Window Closed / Lapsed |