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Related Concept Videos

Eddy Currents01:25

Eddy Currents

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Since eddy currents occur only in conductors, magnets can separate metals from other materials. For example, in a recycling center, trash is dumped in batches down a ramp, beneath which lies a powerful magnet. Conductors in the trash are slowed by eddy currents, while nonmetals in the trash move on, separating from the metals. This works for all metals, not just ferromagnetic ones.
Other major applications of eddy currents appear in metal detectors and the braking systems of trains and roller...
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Induced Electric Fields: Applications01:27

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An important distinction exists between the electric field induced by a changing magnetic field and the electrostatic field produced by a fixed charge distribution. Specifically, the induced electric field is nonconservative because it does not work in moving a charge over a closed path. In contrast, the electrostatic field is conservative and does no net work over a closed path. Hence, electric potential can be associated with the electrostatic field but not the induced field. The following...
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Magnetic Field Due to Two Straight Wires01:18

Magnetic Field Due to Two Straight Wires

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Consider two parallel straight wires carrying a current of 10 A and 20 A in the same direction and separated by a distance of 20 cm. Calculate the magnetic field at a point "P2", midway between the wires. Also, evaluate the magnetic field when the direction of the current is reversed in the second wire.
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Magnetic Force On Current-Carrying Wires: Example01:22

Magnetic Force On Current-Carrying Wires: Example

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In a magnetic field, moving charges encounter a force. If a wire contains these moving charges, i.e., if the wire is carrying a current, then a force acts on the wire as well. Consider a pair of flexible leads holding a wire that is 40 cm long and 10 g in weight in a horizontal position. The wire is placed in a constant magnetic field of 0.40 T, as shown in Figure 1(a). Determine the magnitude and direction of the current flowing in the wire needed to remove the tension in the supporting leads.
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Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

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Consider an infinitely long straight wire carrying a current I. The magnetic field at point P at a distance a from the origin can be calculated using the Biot-Savart law.
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Energy Stored In A Coaxial Cable01:31

Energy Stored In A Coaxial Cable

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A coaxial cable consists of a central copper conductor used for transmitting signals, followed by an insulator shield, a metallic braided mesh that prevents signal interference, and a plastic layer that encases the entire assembly.
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Related Experiment Video

Updated: Dec 9, 2025

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
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Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors

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Wireless power transfer-based eddy current non-destructive testing using a flexible printed coil array.

Lawal Umar Daura1,2, GuiYun Tian1,3, Qiuji Yi1

  • 1School of Engineering, Newcastle University, Newcastle upon Tyne NE1 7RU, UK.

Philosophical Transactions. Series A, Mathematical, Physical, and Engineering Sciences
|September 14, 2020
PubMed
Summary
This summary is machine-generated.

A novel flexible printed coil array using wireless power transfer (WPT) enables advanced eddy current testing (ECT). This system effectively maps and reconstructs complex defects, improving non-destructive evaluation (NDE) for challenging structures.

Keywords:
eddy current testingfeature extractionflexible coil arrayresonant frequencyselection and fusionwireless power transfer

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Area of Science:

  • Electromagnetic non-destructive evaluation
  • Advanced materials and devices

Background:

  • Eddy current testing (ECT) is a mature non-destructive testing and evaluation (NDT&E) method.
  • Traditional ECT faces challenges with complex geometries and defect reconstruction.
  • Advancements in wireless power transfer (WPT) and flexible electronics offer new solutions.

Purpose of the Study:

  • To propose and validate a novel transmitter-receiver (Tx-Rx) flexible printed coil (FPC) array utilizing WPT for enhanced ECT.
  • To leverage dual resonance responses for comprehensive material and defect characterization.
  • To enable 3D defect reconstruction in complex structures like curved pipes.

Main Methods:

  • Development of a WPT-based FPC array with a single excitation coil and 16 receiving coils.
  • Experimental investigation on a curved pipe with a natural dent defect.
  • Application of deep learning for feature extraction, selection, and fusion of dual resonance responses for quantitative NDE.

Main Results:

  • The proposed FPC array successfully mapped a dent defect on a curved pipe surface.
  • Dual resonance responses provided multiple parameters for defect and lift-off characterization.
  • Deep learning-based feature fusion demonstrated outstanding performance in 3D defect reconstruction.

Conclusions:

  • WPT-based FPC arrays offer a promising approach for advanced ECT, particularly for complex geometries.
  • Dual resonance analysis combined with deep learning significantly enhances defect characterization and 3D reconstruction capabilities.
  • This technology advances the field of electromagnetic non-destructive evaluation for smart monitoring applications.