Portable transmitter apparatus for inducing alternating current

Details Portable transmitter apparatus for inducing alternating current Portable transmitter apparatus for inducing alternating current

1990-05-08

1991-10-08

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

324329, G01V 311, G01V 3165

Patent

active

050557939

ABSTRACT:
A system of apparatus for locating underground metallic lines includes a transmitter apparatus at a first work station above ground for inducing a current in the line and a receiver at a second work station for making field measurements. The transmitter apparatus includes a battery-powered transmitter circuit supported from a portable housing, a ferrite core antenna incorporated within the transmitter circuit, and a separate tank circuit which includes a loop antenna and a capacitor and is tuned to a predetermined operating frequency and is electrically isolated from the ferrite core antenna. The ferrite core antenna transfers energy through a magnetic flux field to the loop antenna, and a magnetic field generated from the loop antenna inductively creates an alternating current in the line which then generates an alternating electromagnetic field about the line at the second work station.

REFERENCES:
patent: 3617865 (1971-11-01), Hakata
patent: 3653050 (1972-03-01), Eggleston, Jr.
patent: 3742341 (1973-06-01), Clowes et al.
patent: 3852758 (1974-12-01), Polson
patent: 4348639 (1982-09-01), Karbowski
patent: 4458204 (1984-07-01), Weber
patent: 4691165 (1987-09-01), Szedlmajer
patent: 4785247 (1988-11-01), Meador et al.
patent: 4818944 (1989-04-01), Rippingale

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