Method for locating an underground septic tank, conduit, or the like using injection/detection synchronization of an acoustic signal and digital signal processing
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United States of America Patent
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Feb 14, 2012
Grant Date -
Apr 30, 2009
app pub date -
Nov 23, 2008
filing date -
Nov 23, 2008
priority date (Note) -
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Abstract
A non-invasive method for easily locating an underground septic tank, distribution box, field line, conduit, or underground cavity is disclosed. In a preferred embodiment, prescribed acoustic signals are injected into an underground cavity via an accessible port and remotely detected by a time synchronized detector in contact with the ground which cross correlates the detected signal with a duplicate of the prescribed acoustic signal in order to reject background noise, and thus locate the underground cavity. A frequency sweep is conducted to exploit cavity resonance modes and thus further enhance the signal to noise ratio.
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