Metal detector with phase related circuit selective discriminati

Details Metal detector with phase related circuit selective discriminati Metal detector with phase related circuit selective discriminati

1977-01-17

1978-07-04

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

G01V 310

Patent

active

040991164

ABSTRACT:
An improved metal detector circuit with selective discrimination for soil, mineral content or unwanted metal objects is described in which phase related adjustable feedback circuits are utilized to nullify unwanted signals in the receiver detector circuits. A mode switch connects either unwanted metallic object rejection level feedback control or ground mineral rejection controls as desired into the reception coil circuit. By phase relating the transmission and reception coils in a metal detector, all of the mineral content in the soil which produces unwanted signals in the receiver can be nulified so that a practical detector for use in high mineral content areas results.

REFERENCES:
patent: 3065407 (1962-11-01), Huddleston et al.
patent: 3676772 (1972-07-01), Lee
patent: 3826973 (1974-07-01), Pflaum
patent: 4024463 (1977-05-01), Hirschi
patent: 4030026 (1977-06-01), Payne
Leslie, Eric; How Mine Detectors Work Radio-Craft, Jul. 1946, pp. 676, 677, 721.

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