Apparatus and method employing extraneous field compensation for locating current-carrying objects
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United States of America Patent
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Jan 27, 1987
Grant Date -
N/A
app pub date -
Apr 11, 1983
filing date -
Apr 11, 1983
priority date (Note) -
Expired
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Abstract
In locating current-carrying objects, such as buried pipes in the presence of extraneous magnetic fields by detecting the magnetic field produced by the current, first and second spaced primary sensors measure the magnetic field at first and second locations, and a compensating sensor measures the extraneous field at a location midway between the first and second locations. The signal from the compensating sensor is combined with the signals from both of the primary sensors so as to compensate for the extraneous magnetic field at the primary sensors. The invention compensates for ambient magnetic fields associated with propagating electromagnetic energy that induces current in an object, and compensates for extraneous magnetic fields produced by current flow in an adjacent object.
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