Method and apparatus for monitoring the relative position of a c

Details Method and apparatus for monitoring the relative position of a c Method and apparatus for monitoring the relative position of a c

1997-09-29

1999-11-30

Patidar, Jay

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

324 67, 175 45, G01R 1900, G01V 308, G01V 310

Patent

active

059949040

ABSTRACT:
To more accurately detect the position of a boring head (16) relative to a utility conveyance (22) during a boring operation, the conveyance carries a low power, pulsed signal. The signal is detectable only with a limited distance from the conveyance corresponding to a minimum allowable distance between the boring head and the conveyance. The boring head (16) carries at least one detector (28) for detecting the signal radiated by the cable. If the detector (28) detects the signal, then the boring head is too close and boring operation is interrupted.

REFERENCES:
patent: 5644237 (1997-07-01), Eslambolchi et al.
patent: 5757190 (1998-05-01), Mercer
patent: 5798644 (1998-08-01), Eslambolchi et al.

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