Surface mounted sensor arrays having segmented primary windings
First Claim
1. A method for creating a spatially periodic magnetic field with at least two periods comprising:
- providing a primary winding including a plurality of drive coils, each drive coil being formed by parallel, extended portions; and
driving current through individual drive coils in alternating directions with the current through adjacent extended portions of different drive coils flowing in a common direction to impose a spatially periodic magnetic field, with at least two periods, in a test material.
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Abstract
One of the issues with planar eddy-current sensors is the placement of the current return for the primary winding. Often the ends of the primary winding are spatially distant from one another, which creates an extraneous and large inductive loop that can influence the measurements. A sensor geometry featuring a primary winding that reduces the effect of this inductive loop is presented. The primary winding may include a plurality of parallel extended winding segments. The segments further include adjacent individual drive coils. Current flows through individual drive coils in an alternating fashion. Current flows through adjacent drive coil portions in a common direction, thereby imposing a spatially periodic magnetic field with at least two periods.
44 Citations
17 Claims
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1. A method for creating a spatially periodic magnetic field with at least two periods comprising:
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providing a primary winding including a plurality of drive coils, each drive coil being formed by parallel, extended portions; and driving current through individual drive coils in alternating directions with the current through adjacent extended portions of different drive coils flowing in a common direction to impose a spatially periodic magnetic field, with at least two periods, in a test material. - View Dependent Claims (2, 3, 4, 5, 6, 7, 8)
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9. A test circuit for creating a magnetic field comprising:
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a primary winding including a plurality of drive coils to impose a magnetic field in a test material when driven by an electric current, each drive coil being formed by parallel, extended portions; and connections between the parallel, extended portions to maintain current flow, with the current flow in adjacent extended portions of different individual drive coils in a common direction. - View Dependent Claims (10, 11, 12, 13, 14, 15, 16, 17)
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Specification