Apparatus for determining the distance to a concealed conductive

Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location

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G01V 311, G01B 714

Patent

active

043873405

ABSTRACT:
An apparatus to measure the distance to a concealed conductive object, radiating an electromagnetic signal, has two sensors, each adapted to receive the signal and to produce an output voltage proportional to the amount of signal received. Amplifier means amplify the output voltage. Automatic gain control means automatically controls the gain to the amplifier means such that the gain of the amplification of one of the output voltages is the same as the gain of the amplification of the other output voltage. Computing means calculate the distance based upon the two amplified output voltages. Display means display the calculated value.

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Young, C. A., "Measuring the Depth of Buried Cable", Bell Laboratories Record, Nos. 1965, pp. 399-401.

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