Electronic metal detector return signal phase changer

Details Electronic metal detector return signal phase changer Electronic metal detector return signal phase changer

1992-02-20

1993-09-21

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

324233, G01D 311

Patent

active

052472574

ABSTRACT:
A device is disclosed for use with heterodyne metal detectors to eliminate the indication of the detected presence of certain specific metals to the operator. A specially tuned circuit rotated adjacent the detector interacts with the circuitry of the detector to eliminate the audio and visual response of the detector to certain predetermined undesired metal objects. The device includes two coils, one of low impedance and high resistance and the other of high impedance and low resistance.

REFERENCES:
patent: 4024468 (1977-05-01), Hirschi
patent: 4293816 (1981-10-01), Johnson

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