Self-calibrating electromagnetic field sensor for locating buried conduits
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United States of America Patent
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Aug 27, 1991
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N/A
app pub date -
Apr 16, 1990
filing date -
Apr 16, 1990
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Expired
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Abstract
An electromagnetic field sensing apparatus used for locating and determining the distance to buried conductive conduits including at least two receptor means, each adapted to receive a signal from the conduit and produce an output voltage proportional to the signal received, and also including a calibrating coil, with known relative coupling to the receptor means, and capable of inducing calibrating signals therein. Computing means are employed to calculate the relative sensitivities of each said receptor means using the voltage signals induced therein by the calibrating coil, and said known relative coupling relationships. The computing means further uses the output voltages from said receptor means, induced therein by the signal radiating from the conductive conduit, and said relative sensitivities to calculate the distance to and location of the conduit. Display means are provided to indicate this distance and location.
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