Metal detector with feedback tuning

Details Metal detector with feedback tuning Metal detector with feedback tuning

1977-09-30

1978-12-19

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324236, G01V 308

Patent

active

041307925

ABSTRACT:
Metal detector of the type having a tuned sensing loop which undergoes a shift in resonance and Q when brought into proximity to metal objects. In the absence of metal objects, the detector operates in a closed loop mode in which negative feedback is utilized to offset errors and maintain the excitation signal at an optimum frequency. Upon detection of a metal object, the system switches to an open loop mode in which the excitation signal remains at the optimum frequency and the output signal varies in accordance with the proximity of the object.

REFERENCES:
patent: 3201774 (1965-08-01), Uemura
patent: 3202909 (1965-08-01), Stewart
patent: 3346856 (1967-10-01), Doble et al.
patent: 3373374 (1968-03-01), Marosi
patent: 3400365 (1968-09-01), French
patent: 3451041 (1969-06-01), Marosi et al.
patent: 3685013 (1972-08-01), Brickner
patent: 3961238 (1976-06-01), Randolph

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