Eddy current induction sensing method and device
AssigneeNational Tsing Hua University
InventorTing-Wei Wang
Life of this patent
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Abstract
An eddy current induction sensing method includes: providing an excitation signal to a first coil; generating a first electromagnetic signal, by the first coil, caused by the excitation signal; coupling the first electromagnetic signal to a second coil to cause the second coil to generate a second electromagnetic signal; generating an induced eddy current by a target conductor while the target conductor receives the first electromagnetic signal or the second electromagnetic signal, wherein the induced eddy current at least partially offsets the second electromagnetic signal of the second coil; and measuring, from the second coil, a variation of the at least partially offset second electromagnetic signal to determine a state of the target conductor.
Claims12
An eddy current induction sensing method, comprising:
- providing an excitation signal to a first coil;
- generating a first electromagnetic signal, by the first coil, caused by the excitation signal;
- coupling the first electromagnetic signal to a second coil to cause the second coil to generate a second electromagnetic signal;
- generating an induced eddy current by a target conductor while the target conductor receives the first electromagnetic signal or the second electromagnetic signal, wherein the induced eddy current at least partially offsets the second electromagnetic signal of the second coil;
- and
- measuring, from the second coil, a variation of the at least partially offset second electromagnetic signal to determine a state of the target conductor.
An eddy current induction sensing device, comprising:
- a first coil;
- a second coil;
- a signal generating unit coupled to the first coil, wherein the signal generating unit includes an AC/DC signal generator composed of one or more active components and/or passive components and is configured to provide an excitation signal to the first coil to cause the first coil to generate a first electromagnetic signal, wherein the first electromagnetic signal is coupled to the second coil to cause the second coil to generate a second electromagnetic signal;
- and
- a measuring unit coupled to the second coil,
- wherein an induced eddy current is generated by a target conductor while the target conductor receives the first electromagnetic signal or the second electromagnetic signal, wherein the induced eddy current at least partially offsets the second electromagnetic signal of the second coil,
- wherein the measuring unit measures, from the second coil, a variation of the at least partially offset second electromagnetic signal to determine a state of the target conductor.
Dependencies are inferred from the claim text.