Ferrous target identification system with magnetic field polarit

Details Ferrous target identification system with magnetic field polarit Ferrous target identification system with magnetic field polarit

1995-09-21

1997-09-23

Strecker, Gerard R.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

By magnetic means

324326, G01V 308, G01V 3165, G01V 340

Patent

active

056708823

ABSTRACT:
A target identification system for detecting a desired ferrous object concealed beneath a surface is provided for a gradiometer. The system has first and second sensors for detecting a magnetic field at a first and second points above the surface. A device for providing drive signals for the sensors is connected to the sensors, to generate sensor output signals proportional to the magnetic fields sensed by the sensors. The outputs of the sensors are connected to means for generating a difference signal at an output thereof, the difference signal being the difference between the output signals of the sensors and being proportional to the detected gradient of the magnetic field between the first and second points. An interface receives the difference signal for producing an indication signal when said magnetic field has a selected polarity and when the magnitude of the detected magnetic field gradient exceeds a set value. For example, the interface can comprise a pair of LEDs, for the two different polarities, which are only activated if a threshold is exceeded. This enables a user to distinguish unwanted objects which typically will show an opposite polarity from target objects.

REFERENCES:
patent: 3757501 (1973-09-01), Bennett, Jr. et al.
patent: 3781664 (1973-12-01), Rorden
patent: 4021725 (1977-05-01), Kirkland
patent: 4068164 (1978-01-01), Schwartz et al.
patent: 4427942 (1984-01-01), Sole
patent: 4439732 (1984-03-01), Hesterman et al.
patent: 5321361 (1994-06-01), Goodman

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