Metal detector for locating objects with full sensitivity in the

Details Metal detector for locating objects with full sensitivity in the Metal detector for locating objects with full sensitivity in the

1979-11-28

1982-04-13

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

043250270

ABSTRACT:
An apparatus for detecting metallic objects of a predetermined type buried in the ground and distinguishing such predetermined objects from distributed mineral material and undesired objects. An oscillator produces a transmit signal which causes a transmit coil to generate a varying magnetic field. A receive coil coupled with the transmit coil produces a receive signal induced by the transmit signal and having components thereof corresponding to field-distorting materials in proximity to the coil. A multiple sampling circuit produces samples of the receive signal at selected times having predetermined relationships with typical characteristics receive signal components. The samples are analyzed to produce a sense signal representative of the proximity of a metallic object, and a discriminate signal representative of the type of metallic object as well as its proximity. A sense signal produces aural and visual outputs under the control of the discriminate signal, which cuts off the sense signal in the presence of an undesired metallic object absent the presence of a target object, and adds to the sense signal in the presence of a target object. The apparatus tracks the amplitude of any component of the receive signal attributable to distributed mineral materials so that such a component may be canceled in the discriminate signal.

REFERENCES:
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