Method for near field electromagnetic proximity determination fo

Details Method for near field electromagnetic proximity determination fo Method for near field electromagnetic proximity determination fo

1998-03-26

1999-07-13

Strecker, Gerard

Electricity: measuring and testing

Of geophysical surface or subsurface in situ

For small object detection or location

175 45, 175 62, 32420717, 324346, E21B 704, E21B 47022, G01V 308, G01V 338

Patent

active

059231700

ABSTRACT:
A method and apparatus for precise measurement of the distance and direction from a magnetic field sensor to a nearby magnetic field source includes an elongated iron core solenoid driven by a repetitive, nonsinusoidal current source. In the near field the solenoid has two spaced, temporally varying magnetic poles, and measurement of the distance and direction to this source includes analysis of field components which vary in synchronism with the current source.

REFERENCES:
patent: 4110679 (1978-08-01), Payne
patent: 5343152 (1994-08-01), Kuckes
patent: 5485089 (1996-01-01), Kuckes
patent: 5537041 (1996-07-01), Candy

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