Method and apparatus for precisely locating a buried utility con

Details Method and apparatus for precisely locating a buried utility con Method and apparatus for precisely locating a buried utility con

1995-09-27

1997-07-01

O'Shea, Sandra L.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

324 67, G01R 1900, G01V 308, G01V 310

Patent

active

056442378

ABSTRACT:
An underground utility conveyance (10) may be precisely located by impressing both a locating tone and a confirmation tone on the conveyance. The locating tone is an RF signal that produces a first field that radiates above the earth that is sensed by a first, above-ground signal detector (22) to establish the general location of the conveyance. The confirmation tone is a near-DC signal that produces a second, field having a relatively limited radiation path. A second detector (24) is inserted into the earth at successive places in the region where the conveyance is located to establish its precise location.

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