Metal detector with two magnetic field transducers connected in opposing relationship and their sensing directions orthogonal to the magnetic field
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United States of America Patent
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Feb 5, 1991
Issued Date -
N/A
app pub date -
Jul 17, 1987
filing date -
Jul 17, 1987
priority date (Note) -
Expired
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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.
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