Dual frequency metal detector system

Details Dual frequency metal detector system Dual frequency metal detector system

1976-01-19

1976-10-12

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324 41, G01V 308

Patent

active

039861040

ABSTRACT:
A metal detector circuit is disclosed utilizing a search coil inductively coupled to two parallel connected oscillator circuits operating at different frequencies for selectively responding to metal objects in the vicinity of the search coil. Each oscillator circuit may include a dual tuned resonant circuit for neutralizing the effects of ferromagnetic minerals in the vicinity of the search coil.

REFERENCES:
patent: 3171071 (1965-02-01), Brown
patent: 3201774 (1965-08-01), Vemura
patent: 3492567 (1970-01-01), Baker
patent: 3519919 (1970-07-01), Rance
patent: 3686564 (1972-08-01), Mallick et al.
patent: 3823365 (1974-07-01), Anderson
patent: 3875498 (1975-04-01), Mahan et al.
patent: 3961238 (1976-06-01), Randolph

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