Detecting device and method thereof
AssigneeIndustrial Technology Research Institute
InventorsChung-Fan Tu, Hau-Wei Wang
Life of this patent
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Abstract
A detecting device includes a first coil, a third coil, a second coil, and a fourth coil. The first coil generates a first magnetic field on a to-be-measured object. The third coil generates a third magnetic field under the to-be measured object. The second coil generates a second magnetic field. After the fourth coil receives the second magnetic field, a voltage is induced. The induced voltage is amplified by an amplify circuit to drive the third coil. The directions of the currents generated by the first coil and the third coil, respectively, are the same.
Claims62
A detecting device, comprising:
- a first coil set, generating a main magnetic field toward a first side of a to-be-measured object through a main circuit, wherein the to-be-measured object further comprises a second side opposite to the first side;
- and
- a second coil set, generating a compensation magnetic field toward the second side of the to-be-measured object through a compensation circuit;
- wherein a first current generated by the main magnetic field and a second current generated by the compensation magnetic field magnetic field have a same direction;
- wherein the first coil set forms a positive feedback through an amplifier.
A detecting method, comprising:
- providing, by a main circuit, a first alternating current to generate, via a first coil set, a main magnetic field toward a first side of above a to-be-measured object, wherein the to-be-measured object further comprises a second side opposite to the first side;
- and
- providing, by a compensation circuit, a second alternating current to generate, via a second coil set, a compensation magnetic field toward the second side of below the to-be-measured object;
- wherein a first current generated by the main magnetic field and a second current generated by the compensation magnetic field magnetic field have a same direction;
- wherein the first coil set forms a positive feedback through an amplifier.
A detecting device, comprising:
- a first coil, generating a first magnetic field toward a first side of above a to-be-measured object, wherein the to-be-measured object further comprises a second side opposite to the first side;
- a third coil, generating a third magnetic field toward the second side of below the to-be-measured object;
- a second coil, generating a second magnetic field;
- and
- a fourth coil, wherein a voltage is induced after the fourth coil receives the second magnetic field, and the voltage is amplified by a compensation circuit to drive the third coil;
- wherein a first current generated by the first magnetic field and a third current generated by the third magnetic field have a same direction;
- wherein the first coil and the second coil form a positive feedback through an amplifier.
Dependencies are inferred from the claim text.