Method and apparatus for detecting underground utility...

G - Physics – 01 – V

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G01V 3/00 (2006.01) G01V 3/12 (2006.01)

Patent

CA 2205544

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

Un câble ou tuyau d'alimentation souterrain (10) peut être localisé avec précision par application audit câble ou tuyau d'un son de localisation et d'un son de confirmation. Le son de localisation consiste en un signal à haute fréquence produisant un premier champ qui rayonne au-dessus du sol et est capté par un premier détecteur (22) situé au-dessus du sol pour déterminer l'emplacement général du câble ou du tuyau. La fréquence de confirmation consiste en un signal de courant quasi-continu produisant un second champ dont le trajet de rayonnement est relativement limité. Un second détecteur (24) est inséré dans le sol en des points successifs dans la zone où se trouve le câble ou le tuyau pour déterminer son emplacement précis.

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