Jove
Visualize
Contact Us
JoVE
x logofacebook logolinkedin logoyoutube logo
ABOUT JoVE
OverviewLeadershipBlogJoVE Help Center
AUTHORS
Publishing ProcessEditorial BoardScope & PoliciesPeer ReviewFAQSubmit
LIBRARIANS
TestimonialsSubscriptionsAccessResourcesLibrary Advisory BoardFAQ
RESEARCH
JoVE JournalMethods CollectionsJoVE Encyclopedia of ExperimentsArchive
EDUCATION
JoVE CoreJoVE BusinessJoVE Science EducationJoVE Lab ManualFaculty Resource CenterFaculty Site
Terms & Conditions of Use
Privacy Policy
Policies

Related Concept Videos

Eddy Currents01:25

Eddy Currents

1.8K
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...
1.8K
Magnetic Damping01:17

Magnetic Damping

610
Eddy currents can produce significant drag on motion, called magnetic damping. For instance, when a metallic pendulum bob swings between the poles of a strong magnet, significant drag acts on the bob as it enters and leaves the field, quickly damping the motion.
If, however, the bob is a slotted metal plate, the magnet produces a much smaller effect. When a slotted metal plate enters the field, an emf is induced by the change in flux; however, it is less effective because the slots limit the...
610
Magnetic Field Of A Current Loop01:16

Magnetic Field Of A Current Loop

5.1K
Consider a circular loop with a radius a, that carries a current I. The magnetic field due to the current at an arbitrary point P along the axis of the loop can be calculated using the Biot-Savart law.
5.1K
Torque On A Current Loop In A Magnetic Field01:13

Torque On A Current Loop In A Magnetic Field

4.8K
The most common application of magnetic force on current-carrying wires is in electric motors. These consist of loops of wire, which are placed between the magnets with a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate, thus converting electrical energy to mechanical energy.
Consider a rectangular current-carrying loop containing N turns of wire, placed in a uniform magnetic field. The net force on a current-carrying loop...
4.8K
Diamagnetic Shielding of Nuclei: Local Diamagnetic Current01:14

Diamagnetic Shielding of Nuclei: Local Diamagnetic Current

1.0K
An applied magnetic field causes the electrons present in the molecule to circulate, setting up a local diamagnetic current within the molecule. The local diamagnetic current arising from circulating sigma-bonding electrons induces a magnetic field, Blocal that opposes the applied magnetic field, B0. The effective magnetic field experienced by these nuclei is given by the difference between the applied and local magnetic fields in a phenomenon called local diamagnetic shielding. Essentially,...
1.0K
Magnetic Field Due To A Thin Straight Wire01:28

Magnetic Field Due To A Thin Straight Wire

5.1K
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.
5.1K

You might also read

Related Articles

Articles linked to this work by shared authors, journal, and citation graph.

Sort by
Same author

Effectiveness of Electrostatic Shielding in High-Frequency Electromagnetic Induction Soil Sensing.

Sensors (Basel, Switzerland)·2022
See all related articles

Related Experiment Video

Updated: Oct 7, 2025

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
06:17

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

Published on: January 16, 2020

5.9K

Model of Magnetically Shielded Ferrite-Cored Eddy Current Sensor.

Darko Vasić1, Ivan Rep1, Dorijan Špikić1

  • 1Faculty of Electrical Engineering and Computing, University of Zagreb, 10000 Zagreb, Croatia.

Sensors (Basel, Switzerland)
|January 11, 2022
PubMed
Summary

This study presents a fast analytical model for eddy current sensors, crucial for efficient model-based measurements and sensor design. The model accurately predicts sensor performance, validated against numerical methods and experimental impedance data.

Keywords:
coileddy currenteigenfunction expansionferrite coremagnetic shieldprobetruncated domain

More Related Videos

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

9.7K
Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish
07:47

Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish

Published on: March 18, 2019

6.8K

Related Experiment Videos

Last Updated: Oct 7, 2025

Quantifying the Relative Thickness of Conductive Ferromagnetic Materials Using Detector Coil-Based Pulsed Eddy Current Sensors
06:17

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

Published on: January 16, 2020

5.9K
Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples
07:01

Frequency Mixing Magnetic Detection Scanner for Imaging Magnetic Particles in Planar Samples

Published on: June 9, 2016

9.7K
Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish
07:47

Assessing the Influence of Personality on Sensitivity to Magnetic Fields in Zebrafish

Published on: March 18, 2019

6.8K

Area of Science:

  • Electromagnetics
  • Sensor Technology
  • Computational Modeling

Background:

  • Fast electromagnetic models for eddy current sensors are essential for real-time applications like model-based measurements and machine interpretation.
  • Analytical modeling offers advantages over numerical methods in terms of implementation simplicity and computational speed when sensor geometry permits.

Purpose of the Study:

  • To develop a computationally efficient analytical model for an eddy current sensor with a ferrite core and magnetic shield.
  • To validate the model's accuracy against the finite element method and experimental impedance measurements.

Main Methods:

  • Utilized a vector magnetic potential formulation with truncated region eigenfunction expansion.
  • Derived analytical expressions for transmitter coil impedance and magnetic potential.
  • Compared model predictions with finite element method (FEM) results and experimental impedance data (5 kHz–100 kHz).

Main Results:

  • The analytical model demonstrated excellent agreement with finite element method simulations.
  • Experimental validation showed agreement within 3% for resistance change and 1% for inductance change due to a conductive and magnetic half-layer.
  • The model accurately captures the sensor's response to the presence of a target material.

Conclusions:

  • The developed analytical model provides a fast and accurate method for eddy current sensor analysis.
  • This model is suitable for applications including metallic object property measurement, sensor lift-off estimation, and nonconductive coating thickness determination.