Static magnetic field metal detector

Details Static magnetic field metal detector Static magnetic field metal detector

1974-11-11

1976-06-15

Trafton, David L.

Communications: electrical

Systems

Call station

324 41, G08B 2100

Patent

active

039640426

ABSTRACT:
A static magnetic field detector senses the passage of ferrous or magnetic objects, employing a balanced magnetic field excitation configuration providing substantial self-cancellation of spurious background signals. The pick up coil of the detector is disposed in a spacially reversing static magnetic field, being cooperatively effective to sense the passage of such objects with respect to an extended passage way by reacting to the field distortion caused by the object and producing an alarm or control signal. Further reduction of the effects of spurious background signals is afforded by novel means for processing the signals generated within the detector.

REFERENCES:
patent: 2179240 (1939-11-01), Breitenstein
patent: 2696602 (1954-12-01), Evans
patent: 2760182 (1956-08-01), Rechten et al.
patent: 3065412 (1962-11-01), Rosenthal
patent: 3444458 (1969-05-01), Scott

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