Magnetic field sensor and method for calibrating the same
First Claim
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1. A magnetic field sensor comprising:
- means for producing an output signal that is a function of a magnetic field to be sensed;
a calibration coil arranged so as to change said magnetic field when energized;
means for selectively energizing said calibration coil, and means for determining the sensitivity of said magnetic field sensor based on the difference of said output signal when said calibration coil is energized and said output signal when said calibration coil is not energized.
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Abstract
A magnetic field sensor is provided with a device for producing an output signal that is a function of a magnetic field to be sensed. A calibration coil is arranged so as to change the magnetic field when energized, and a switch for selectively energizing the calibration coil is included. Calibration of the magnetic field sensor is accomplished by operating the switch to cause a known current to flow through the calibration coil, measuring the resultant change in the magnetic field, and calculating a sensitivity for the magnetic field sensor from the measured change in the magnetic field and the known current.
65 Citations
29 Claims
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1. A magnetic field sensor comprising:
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means for producing an output signal that is a function of a magnetic field to be sensed;
a calibration coil arranged so as to change said magnetic field when energized;
means for selectively energizing said calibration coil, and means for determining the sensitivity of said magnetic field sensor based on the difference of said output signal when said calibration coil is energized and said output signal when said calibration coil is not energized. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13)
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14. A magnetic field sensor comprising:
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a generally C-shaped core in which a magnetic field is generated, said C-shaped core having a gap formed therein;
means for producing an output signal that is a function of said magnetic field;
a calibration coil wound on said core so as to change said magnetic field when energized; and
means for selectively energizing said calibration coil. - View Dependent Claims (15, 16, 17, 18, 19, 20, 21, 22, 23, 24, 25)
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26. A method for calibrating a magnetic field sensor, said method comprising the steps of:
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providing a calibration coil, said calibration coil arranged so as to change a magnetic field to be sensed;
causing a known current to flow through said calibration coil;
measuring the resultant change in said magnetic field; and
calculating a sensitivity for said magnetic field sensor from said measured change in said magnetic field and said known current. - View Dependent Claims (27, 28, 29)
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Specification