Electricity: measuring and testing – Conductor identification or location – Inaccessible
Patent
1992-02-25
1993-08-03
Gregory, Bernarr E.
Electricity: measuring and testing
Conductor identification or location
Inaccessible
324326, G01R 1900
Patent
active
H00012173
ABSTRACT:
The ground-wire detector of the invention is a portable device used to locate buried ground-wires of an energized very low frequency/low frequency antenna system operating within the frequency range of 15 kHz to 200 kHz. This ground-wire detector has an oscillator section that is tunable by a dial located on the detector. Because of this feature, an operator can change the oscillator's frequency without the need for component replacement.
The detector of the invention includes two series-connected oppositely-wound coplaner coils spaced approximately 15 inches apart. The coils are oppositely wound to generate a maximum detection signal when centered over an energized ground-wire. The coils generate a detection signal when placed within the vertical magnetic fields formed by energized antenna ground-wires and are designed to incur minimal interference from the large horizontal magnetic field radiating from an adjacent transmitting antenna station.
In the ground-wire detector of the invention, the transmitter station frequency radiated by the buried ground-wires and detected by the instrument's coils, is mixed with a tuning frequency selected by a device operator and generated from a continuously tunable oscillator made a part of the ground-wire detector. The difference between the tuning frequency and that of the energized ground-wires is audio amplified and routed to a set of monaural headphones.
REFERENCES:
patent: 3597680 (1971-08-01), Haddon
patent: 4427942 (1984-01-01), Sole
patent: 4639674 (1987-01-01), Rippingale
patent: 5043666 (1991-08-01), Tavernetti et al.
Hansen, Peder M., Antenna Buried Ground Wire Locator, Navy Technical Discure Bulletin, vol. 9, No. 1, Sep. 1983, pp. 25-29.
Seeley, Elwin W., Ground Conductor Fault Detector, Informal Technical Report, Naval Ocean Systems Center, Feb. 11, 1982, pp. 1-6.
Fendelman Harvey
Gregory Bernarr E.
Keough Thomas Glenn
Lipovsky Peter A.
The United States of America as represented by the Secretary of
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