Electricity: measuring and testing – Of geophysical surface or subsurface in situ – For small object detection or location
Patent
1998-10-08
2000-08-22
Strecker, Gerard
Electricity: measuring and testing
Of geophysical surface or subsurface in situ
For small object detection or location
32420717, 324247, 175 45, G01V 308, G01V 338, E21B 47024
Patent
active
061078018
ABSTRACT:
If a solenoid is mounted on an underground object, such as a boring tool, magnetic fields generated by an electric current flowing through that solenoid can be detected by a suitable detector at or above the surface. If the axis of the solenoid is tilted, the maximum value of the field is not directly above the solenoid. Therefore, the present invention makes use of measured values of horizontal and vertical components of the magnetic field to determine the separation of the detector and the solenoid, and also, by making use of a tilt sensor associated with the solenoid to derive a prediction of the ratio of the horizontal and vertical components of the field at a position vertically above or below the solenoid. If that predicted value of the ratio is then compared with the measured value of the ratio, the two will coincide when the detector is vertically above the solenoid. Thus, by moving the detector until such coincidence is obtained, the position of the solenoid can be determined.
REFERENCES:
patent: 5621325 (1997-04-01), Draper et al.
patent: 5917325 (1999-06-01), Smith
patent: 5920194 (1999-07-01), Lewis et al.
Fling Richard William
Hopwood Michael Peter
Radiodetection Limited
Strecker Gerard
Woodbridge Richard C.
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