Instrument for sensing ferromagnetic bodies

Details Instrument for sensing ferromagnetic bodies Instrument for sensing ferromagnetic bodies

G - Physics

01

V

324/48, 324/6, 3

G01V 3/08 (2006.01) G01R 33/022 (2006.01) G01R 33/06 (2006.01) G01V 3/15 (2006.01)

Patent

CA 1244083

ABSTRACT OF THE DISCLOSURE The present invention provides a magnetic flux sensing instrument for locating bodies generating a magnetic flux and/or distorting the earth's magnetic field. The instrument comprises first and second Hall effect devices, each of which generates an electrical signal proportional to any such anomalous flux to which each device is exposed with the devices themselves being spaced apart from one another, such that when approaching a body, the first Hall effect device is positioned for a different exposure to the anomalous flux and generates an electrical signal different from the second Hall effect device. The instrument further includes first and second field bucking members for offsetting effects of the earth's magnetic field on the two Hall effect devices and controlled by a processor receiving the electrical signals from the Hall effect devices to induce first and second bucking fields for opposing the anomalous flux at the first and second Hall effect devices, respectively. The processor, in turn, provides first and second flux related signals, representative of the level of bucking required at each of the first and second Hall effect devices and a means for comparing the magnitudes of the first and second flux related signals with an output for showing differences therebetween indicating presence of the body.

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