Apparatus including a pair of automatic gain controlled amplifie

Details Apparatus including a pair of automatic gain controlled amplifie Apparatus including a pair of automatic gain controlled amplifie

1983-06-03

1985-05-28

Strecket, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

G01V 311, G01V 3165

Patent

active

045203172

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.

REFERENCES:
patent: 3617865 (1971-11-01), Hakata
patent: 3991363 (1976-11-01), Lathrop
patent: 4091322 (1978-05-01), Stankoff
patent: 4134061 (1979-01-01), Gudgel
patent: 4220913 (1980-09-01), Howell et al.

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