Patent ID: 8701677
Filing Date: 2014-04-22
Classification: A61B

Abstract:
1. A method of measuring a magnetic dipole by using spatial geometry characterization, the method comprising: determining position data (of point O) and orientation of the magnetic dipole, comprising removing background magnetic field in a target area; placing an object having a permanent magnetic dipole in the target area; sensing a magnetic field of the object using a plurality of magnetic sensors distributed on two sensor planes, wherein a first sensor plane is opposite to a second sensor plane, and the first and the second sensor planes are parallel to each other; identifying position points (A and B) of a maximum magnetic field of the object on the two sensor planes; and deriving a position of the object by solving Equation 6 (Eq.6) and Equation 7 (Eq.7): wherein B B B B θ is an angle between a position vector of a field measurement at point O and the line connecting point A to point B.