Correction method and device for a magnetic field probe
First Claim
1. A correction system for a magnetic field probe which measures an external magnetic field in terms of magnitude and direction, and wherein the probe is moved in a circle before a beginning of the measurement, comprising:
- means for determining maximum and minimum values of a magnetic field vector relative to the probe by continuous measurement of said magnetic field vector during the circular movement;
means for forming a correction vector from a halved vector sum of said maximum and minimum values;
means for vectorally adding the correction vector to the respective measured values of the probe during the continuous measurement;
the magnetic field probe being followed by an evaluation circuit whose output is selectively connected over a changeover means to a calibration means or to a measuring unit having a display device connected thereto;
and a correction value memory being provided whose input is connected to the calibration means and its output is connected to the measuring unit.
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Accused Products
Abstract
In a correction system for a magnetic field probe, the probe is first moved in a circle for calibration such that respective maximum and minimum values of a measured magnetic field vector or a respective component thereof is determined. By means of a sum formation and halving of the respective maximum and minimum value, a respective additive correction value is derived which is added to the respective measured values during navigation with the magnetic field probe. By so doing, a noise vector superimposed on the external magnetic field is eliminated.
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Citations
8 Claims
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1. A correction system for a magnetic field probe which measures an external magnetic field in terms of magnitude and direction, and wherein the probe is moved in a circle before a beginning of the measurement, comprising:
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means for determining maximum and minimum values of a magnetic field vector relative to the probe by continuous measurement of said magnetic field vector during the circular movement; means for forming a correction vector from a halved vector sum of said maximum and minimum values; means for vectorally adding the correction vector to the respective measured values of the probe during the continuous measurement; the magnetic field probe being followed by an evaluation circuit whose output is selectively connected over a changeover means to a calibration means or to a measuring unit having a display device connected thereto; and a correction value memory being provided whose input is connected to the calibration means and its output is connected to the measuring unit. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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Specification