Patent ID: 9638822
Date: 2017-05-02
CPC Classifications: G01V,G06K,G08B

Claim:
1. A system for locating a pipe buried underground, the system comprising: a first cluster of magnetomechanical markers disposed on the pipe at a first pipe location; a second cluster of magnetomechanical markers disposed on the pipe at a second location, wherein each cluster comprises at least two magnetomechanical markers, wherein a distance separating the first location from the second location is greater than a distance separating each magnetomechanical marker within the first cluster; and a portable locating device, wherein the locating device includes at least a single antenna and a battery, wherein each magneto mechanical marker includes a ferromagnetic material that resonates at its characteristic frequency when interrogated with an alternating magnetic field generated by the portable locating device tuned to the characteristic frequency.