Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1979-06-11
1982-04-06
Strecker, Gerard R.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
331 65, G01V 3165
Patent
active
043238475
ABSTRACT:
An apparatus is described for detecting the presence of metal objects which may be subterranean. The apparatus comprises an amplifier equipped with a feedback network for forcing the amplifier into oscillation. The amplifier is critically biased such that the minimum gain necessary to maintain oscillation at the frequency of resonance is achieved. The presence of metal near the search coil which forms the tuned circuit of the amplifier loads the output circuit of the amplifier to a degree which suppresses oscillation. An indicator is provided to indicate when the oscillation has decreased in amplitude, whereby a metal object may be located.
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Strecker Gerard R.
Triple Dee Electronics Inc.
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