Inductive transmitters for conductor location

Details Inductive transmitters for conductor location Inductive transmitters for conductor location

1996-03-15

1998-06-09

Sterrett, Jeffrey L.

Inductor devices

With means to change coil length or connections

With connection reversing means

336147, 336181, 336184, 324345, H01F 2902

Patent

active

057641277

ABSTRACT:
Two vertical, parallel, horizontally spaced signal coils are connected in series but in opposite phase across an a.c. source. Thus a buried conductor located centrally beneath the coils experiences an alternating magnetic field whose strength is due to the addition of the fields induced by the two coils. The field strength may be further enhanced by one or more of: providing a ferromagnetic flux diverter between the upper ends of the coils; placing a conductive nonmagnetic screen between them; connecting a tuning capacitor in parallel with the coils; or providing a tuning circuit having series-connected secondary coils which are flux-linked to respective signal coils and are in parallel with a capacitor. There may be a switch arrangement for switching the signal coils to in-phase connection, for use when they are oriented horizontally.

REFERENCES:
patent: 2161635 (1939-06-01), Prokopenko
patent: 2934698 (1960-04-01), Longland
patent: 3662576 (1972-05-01), Girlatschek
patent: 3860897 (1975-01-01), Kuszleyko
patent: 4112349 (1978-09-01), Weber
patent: 4686454 (1987-08-01), Pecukonis
patent: 4993325 (1991-02-01), Slone
patent: 5554934 (1996-09-01), Ward et al.
patent: 5578926 (1996-11-01), Reinhardt
patent: 5650726 (1997-07-01), Gasnier et al.

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