Sensor Apparatus, in Particular Metal Sensor, with a Field-Compensated Magnetic Field Sensor
First Claim
1. A sensor apparatus, comprising:
- at least two coils; and
a magnetic field sensor,wherein at least one of (i) an arrangement of the at least two coils and magnetic sensor in relation to one another, (ii) a number of coil turns, (iii) a winding sense of the at least two coils, and (iv) a coil current is configured such that a magnetic field produced by the at least two coils at a location of the magnetic field sensor approximately disappears.
1 Assignment
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Accused Products
Abstract
A sensor apparatus, in particular a metal sensor, has at least two coils and a magnetic field sensor. The arrangement of coils and magnetic sensor with respect to one another and/or the number of coil turns and/or the winding sense of the coils and/or the coil current is/are selected such that the magnetic field generated by the coils approximately disappears at the location of the magnetic field sensor. A method for detecting objects, in particular a method for finding metal objects, uses at least two coils and a magnetic field sensor, particularly an AMR, GMR or Hall sensor. The arrangement of the coils and the magnetic sensor with respect to one another and/or the number of coil turns and/or the winding sense of the coils and/or the coil current is/are selected such that the magnetic field generated by the coils approximately disappears at the location of the magnetic field sensor.
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Citations
20 Claims
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1. A sensor apparatus, comprising:
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at least two coils; and a magnetic field sensor, wherein at least one of (i) an arrangement of the at least two coils and magnetic sensor in relation to one another, (ii) a number of coil turns, (iii) a winding sense of the at least two coils, and (iv) a coil current is configured such that a magnetic field produced by the at least two coils at a location of the magnetic field sensor approximately disappears. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8, 9, 10, 11, 12, 13, 18)
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14. A tool comprising:
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at least one sensor apparatus including at least two coils and a magnetic field sensor, wherein at least one of (i) an arrangement of the at least two coils and magnetic sensor in relation to one another, (ii) a number of coil turns, (iii) a winding sense of the at least two coils, and (iv) a coil current is configured such that a magnetic field produced by the at least two coils at a location of the magnetic field sensor approximately disappears.
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15. A method for detecting objects using at least two coils and a magnetic field sensor comprising:
configuring at least one of (i) an arrangement of the at least two coils and the magnetic sensor in relation to one another, (ii) a the number of coil turns, (iii) a winding sense of the coils, and (iv) a coil current such a that the magnetic field produced by the at least two coils at the a location of the magnetic field sensor approximately disappears. - View Dependent Claims (16, 17, 19, 20)
Specification