System including an arrangement for tracking the positional rela

Details System including an arrangement for tracking the positional rela System including an arrangement for tracking the positional rela

1996-05-03

1998-05-26

Snow, Walter E.

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

324 67, 175 45, 175 62, E21B 47022, E21B 4712, E21B 704, G01V 308

Patent

active

057571902

ABSTRACT:
A system is disclosed in which a boring tool is moved through the ground in a region which includes at least one electrically conductive in-ground line. The system includes an arrangement for tracking a specific positional relationship between the boring tool and one or more in-ground lines. The arrangement generates a magnetic field from one of either the boring tool or the line. A particular characteristic of the generated field is detected at the boring tool if the field is generated from the line or is detected at the line if the field is generated from the boring tool. The characteristic varies as a function of the specific positional relationship between the boring tool and the line as the boring tool moves through the ground within the region. The arrangement is responsive to the detection of the characteristic and indicates certain changes in the positional relationship between the boring tool and each one of the lines being monitored irrespective of the approach path or orientation of the boring tool with respect to each line.

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patent: 5585726 (1996-12-01), Chau
patent: 5589775 (1996-12-01), Kuckes

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