Metal detectors for discriminatory detection of buried metal obj

Details Metal detectors for discriminatory detection of buried metal obj Metal detectors for discriminatory detection of buried metal obj

1976-12-01

1978-06-20

Strecker, Gerard R.

Electricity: measuring and testing

Measuring, testing, or sensing electricity, per se

Frequency of cyclic current or voltage

324233, 324239, G01V 310

Patent

active

040964329

ABSTRACT:
A metal detector has a balanced coil arrangement fed by an audio frequency oscillator. In-phase and quadrature components arising when the arrangement is unbalanced by proximate conductive objects are detected, the sense of the quadrature component depending on whether the object is ferromagnetic or non-ferromagnetic. The quadrature component varies the frequency of another audio frequency oscillator above and below a mean value and the in-phase component controls the strength of the audio frequency signal fed from the second oscillator to a transducer such as headphones.

REFERENCES:
patent: 3676772 (1972-07-01), Lee
patent: 3826973 (1974-07-01), Pflaum
patent: 3872380 (1975-03-01), Gardiner
Le Gaye, E. S., Induction Balance Detector, Electronic Metal Detector Handbook, Western Heritage Press, Mar. 1975, pp. 95, 96.

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