Concealed electrical conductor detecting system

Details Concealed electrical conductor detecting system Concealed electrical conductor detecting system

1981-04-21

1984-01-24

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

324 67, G01V 311

Patent

active

044279426

ABSTRACT:
An underground electromagnetic radiating source is detected by two coils (1, 2) one over the other. To avoid false readings due to air borne signals, their outputs are compared (13) and only if the lower coil output is a predetermined amount greater than that of the upper coil is an audio indicator (21) activated. Automatic gain control (9) is applied to both coil outputs, to limit the gain whenever either output threatens saturation.

REFERENCES:
patent: 3471772 (1969-10-01), Smith
patent: 4091322 (1978-05-01), Stankoff
patent: 4220913 (1980-09-01), Howell et al.
patent: 4295095 (1981-10-01), Thomas et al.

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