Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1998-04-13
2000-05-02
Snow, Walter E.
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
G01L 311, G01L 3165, H04B 1302
Patent
active
060576871
ABSTRACT:
A boring tool contains an arrangement for producing a dipole magnetic field. The boring tool is steered through the ground using a boring machine. The position of the boring tool, during its movement through the ground, is established by an above ground receiver in cooperation with and responsive to the magnetic field. The receiver is configured to operate alternatively in first and second modes. When operating the receiver in the first mode positioned above ground, the receiver includes an arrangement responsive to the magnetic field for determining the location of the boring tool as the boring tool moves along a path from a first point to a second point. When operating the receiver in the second mode positioned at a fixed point, the receiver includes an arrangement responsive to the magnetic field for establishing between the boring tool and the receiver a homing path along which the boring tool is steered toward the fixed point.
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Digital Control Incorporated
Pritzkau Mike
Shear Stephen C
Snow Walter E.
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