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Eddy Currents

Eddy Currents

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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Related Experiment Video

Updated: Nov 30, 2025

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

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

Published on: January 16, 2020

Efficient eddy current characterization using a 2D image-based sampling scheme and a model-based fitting approach.

Michael Schwerter^1,2, Markus Zimmermann^1,2, Jörg Felder¹

¹Institute of Neuroscience and Medicine 4, INM-4, Forschungszentrum Jülich, Jülich, Germany.

Magnetic Resonance in Medicine

|November 17, 2020

Summary

This summary is machine-generated.

This study introduces efficient sampling and model-based fitting to characterize eddy currents, significantly reducing residual field offsets for improved magnetic field control.

Keywords:

B0 shimming dynamic shim updating eddy current compensation pre-emphasis

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Area of Science:

Magnetic Resonance Imaging (MRI)
Applied Physics

Background:

Eddy currents are transient magnetic fields generated during MRI operation.
Accurate characterization and compensation of eddy currents are crucial for maintaining image quality and enabling advanced pulse sequences.

Purpose of the Study:

To propose innovations in eddy current characterization techniques.
To develop an efficient spatio-temporal sampling scheme.
To implement a model-based fitting approach for spherical harmonic eddy current components.

Main Methods:

A three-plane 2D image-based acquisition scheme for efficient eddy current field sampling.
Model-based spherical harmonic decomposition with rank minimization for noise reduction.
Simulation and experimental validation of the proposed techniques for pre-emphasis parameter reconstruction.

Main Results:

The proposed method significantly reduces the average maximum residual field offset from 3.17 Hz to 0.58 Hz.
Experimental data confirmed the routine's suitability for measuring and compensating eddy currents within 10 minutes.
The technique effectively reconstructs pre-emphasis parameters.

Conclusions:

The developed framework efficiently characterizes and compensates for eddy current fields.
This method facilitates pre-emphasis implementations, particularly for dynamic B0 shimming applications.
A one-time calibration effort is sufficient for effective eddy current compensation.