Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1979-01-29
1981-12-01
Strecker, 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
043038794
ABSTRACT:
A metal detector (10) is disclosed which has a transmit coil (48) and a receive coil (150) for detecting a metal object due to a change in the magnetic coupling between the coils (48, 150). The metal detector (10) has a plurality of operating modes and for each mode an operating parameter is selected and stored. Each operating parameter is used to generate a demodulation signal. A multiposition switch (36) is manipulated by an operator to select one of the operating modes. A logic circuit (191) is provided to route the demodulation signals to a demodulation circuit (110) to operate on a receive signal from the receive coil (150). An audible signal produced by the metal detector (10) is inhibited when operating modes are changed. An automatic tuning circuit (228) has selectable slewing rates for nulling the output from the metal detector (10).
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Strecker Gerard R.
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