Method and apparatus for locating buried conveyances using locat

Details Method and apparatus for locating buried conveyances using locat Method and apparatus for locating buried conveyances using locat

1997-02-20

1998-08-25

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

057986444

ABSTRACT:
Precise location of a buried utility conveyance (10) is achieved by impressing on the conveyance low frequency conveyance-locating and conveyance confirmation signals, the later being pulsed in a particular pattern unique to the conveyance to be located. A first sensor (22) detects a first magnetic field radiated by the conveyance upon receipt of the conveyance-locating signal. An array (24) of sensors (26.sub.1 -26.sub.5) detects the second magnetic field radiated by the conveyance upon receipt of the conveyance-confirmation signal. A processor (32) coupled to the sensors (26.sub.1 -26.sub.5) precisely vectors the location of the conveyance from the second magnetic field strength sensed by each sensor (26.sub.1 -26.sub.5).

REFERENCES:
patent: 5644237 (1997-07-01), Eslambolchi et al.

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