| 摘要 |
<p>A method and apparatus for precise measurement of the distance and direction from a magnetic field sensor (30) to a nearby magnetic field source includes an elongated iron core solenoid (50) driven by a repetitive, nonsinusoidal current source (56). In the near field the solenoid (50) 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 (56).</p> |
