Metal detector with two magnetic field transducers connected in

Details Metal detector with two magnetic field transducers connected in Metal detector with two magnetic field transducers connected in

1987-07-17

1991-02-05

Snow, Walter E.

Electricity: measuring and testing

Magnetic

With compensation for test variable

324243, 324251, 324262, 340551, G01N 2772, G01R 3300, G01R 3306, G08B 1324

Patent

active

049908502

ABSTRACT:
Apparatus and methods for monitoring a magnetic field and/or detecting ferromagnetic materials. Two transducers are disposed adjacent one another and arranged to provide signals directly related to magnetic field components in parallel but opposite sensing directions. Signal processing apparatus provides an output related to the difference between these two signals. The transducers may be oriented so that the sensing directions are transverse to the magnetic field and the output signal is substantially zero when the magnetic field is in a rest condition. When the magnetic field is disturbed, as by a ferromagnetic body, the output signal changes.

REFERENCES:
patent: 3419798 (1968-12-01), Walton
patent: 3435332 (1969-03-01), Kurdyla
patent: 3579099 (1971-05-01), Kanbayashi
patent: 3619769 (1971-11-01), Kusenberger et al.

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