Method, system and device for calibrating a magnetic field...

Electricity: measuring and testing – Magnetic – Calibration

Reexamination Certificate

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Details

C324S247000, C324S260000, C701S224000, C702S092000, C033S35500D

Reexamination Certificate

active

07119533

ABSTRACT:
A control device200calibrates a magnetic-field sensor100by computation. A computation unit210calculates the magnetic-field intensity based upon the outputs of X-axis, Y-axis, and Z-axis magnetic-field detection devices of the magnetic-field sensor100. Such calculation is performed for four or more different points. The calculation is performed such that at least one point is not positioned on a plane including the other points. The computation unit210converts the outputs from the X-axis, Y-axis, and Z-axis magnetic-field detection devices of the magnetic-field sensor100into three-dimensional spatial coordinate points. Then, the computation unit210creates a sphere on which the four or more coordinate points thus obtained are positioned. The coordinate point of the center of the sphere thus created represents the magnetic-field offset. The interfering magnetic-field components in the X-axis, Y-axis, and Z-axis directions thus obtained are subtracted from the outputs of the X-axis, Y-axis, and Z-axis magnetic-field detection devices of the magnetic sensor100, whereby calibration is made.

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