Concealed electrical conductor detecting system
AssigneeElectrolocation Limited
InventorLloyd H. Sole
Life of this patent
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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.
Claims8
A detection system for concealed current carrying conductors such as underground pipes or cables, comprising two parallel, spaced first and second coils, respective first and second channels through which the coil outputs are directed, a comparator receiving said coil outputs via said channels to produce its own output corresponding the difference in the coil outputs, an indicator, a further channel from the first coil to the indicator, and gating means in said further channel responsive to the comparator output to pass the first coil output to the indicator only when the signal strength in the first coil is greater by a predetermined amount than that in the second coil.
Dependencies are inferred from the claim text.