Large scale metallic object detector

Details Large scale metallic object detector Large scale metallic object detector

1996-07-22

1997-11-18

O'Shea, Sandra L.

Electricity: measuring and testing

Magnetic

With means to create magnetic field to test material

340551, 340572, 324260, G01N 2772, G08B 1324

Patent

active

056891849

ABSTRACT:
Apparatus for detecting a magnetizable or conductive object which passes through a magnetic detecting field. The apparatus includes first and second spaced coils for producing a magnetic field between the spaced coils; first and second magnetic field detectors respectively located within the coils with their sensitive axes parallel to the direction of passage of a magnetizable object between the spaced coils and perpendicular to the primary field of the coils; and electrical circuitry coupled to the first and second magnetic field detectors for producing a detection signal in which common mode field noise and thermally induced noise is substantially eliminated.

REFERENCES:
patent: 4990850 (1991-02-01), Votruba

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