Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1982-10-26
1984-01-24
Tokar, Michael J.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
324243, 324301, 324345, G01V 308
Patent
active
044279434
ABSTRACT:
At least one pair of vector gradiometers is employed to locate (and track) magnetic objects or sources. A first signal, S, is produced as a function of the difference in the absolute values of output signals L and R from left and right gradiometers, respectively. The form of the signal depends upon whether the magnetic field associated with the object or source is symmetric or anti-symmetric and is selected in accordance with observations made as the gradiometer pair passes over the magnetic object or source. A second signal, V, is produced as a function of the sum of the absolute values of signals L and R and represents total strength. A third signal, H=S/V, is produced to determine whether the observer is to the left or to the right of the magnetic object or source and is independent of the magnetic field strength and polarity of the magnetic field, even where the polarity and magnetic field strength vary with distance along a linear source. Compensation is employed for gradiometer sensor misalignment and temperature variations, and extraneous magnetic fields are nulled.
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Cloutier Paul A.
Oehme Delbert R.
Stebbings Ronald F.
Innovatum, Inc.
Tokar Michael J.
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