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Related Concept Videos

Motional Emf01:22

Motional Emf

Magnetic flux depends on three factors: the strength of the magnetic field, the area through which the field lines pass, and the field's orientation with respect to the surface area. If any of these quantities vary, a corresponding variation in magnetic flux occurs. If the area through which the magnetic field lines are passing changes, then the magnetic flux also changes. This change in the area can be of two types: the flux through the rectangular loop increases as it moves into the magnetic...
Magnetic Fields01:27

Magnetic Fields

A moving charge or a current creates a magnetic field in the surrounding space, in addition to its electric field. The magnetic field exerts a force on any other moving charge or current that is present in the field. Like an electric field, the magnetic field is also a vector field. At any position, the direction of the magnetic field is defined as the direction in which the north pole of a compass needle points.
A magnetic field is defined by the force that a charged particle experiences...
Faraday's Law01:10

Faraday's Law

Faraday's law state that the induced emf is the negative change in the magnetic flux per unit of time. Any change in the magnetic field or change in the orientation of the area of the coil with respect to the magnetic field induces a voltage (emf). The magnetic flux measures the number of magnetic field lines through a given surface area. Magnetic flux is estimated from the integral of the dot product of the magnetic field vector and the area vector. The negative sign describes the direction in...
Electromagnetic Fields01:30

Electromagnetic Fields

Electric fields generated by static charges, often referred to as electrostatic fields, are characteristically different from electric fields created by time-varying magnetic fields. While the former is a conservative field, implying that no net work is done on a test charge if it goes around in a complete loop in the field, the latter is, by definition, not a conservative field; net work is done, and it is proportional to the rate of change of magnetic flux.
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Magnetic Force On A Current-Carrying Conductor01:25

Magnetic Force On A Current-Carrying Conductor

Moving charges experience a force in a magnetic field. Since the magnetic fields produced by moving charges are proportional to the current, a conductor carrying a current creates a magnetic field around it.
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Force On A Current Loop In A Magnetic Field01:17

Force On A Current Loop In A Magnetic Field

Magnetic forces on wires carrying current are most frequently applied in motors. A DC motor is a device that converts electrical energy into mechanical work. In motors, wire loops are enclosed in a magnetic field. When current flows through the loops, the magnetic field applies torque, which causes the shaft to rotate. The direction of the current is reversed once the loop's surface area is lined up with the magnetic field, causing a constant torque on the loop. During the process, commutators...

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Related Experiment Video

Updated: Jun 27, 2026

Electric and Magnetic Field Devices for Stimulation of Biological Tissues
13:29

Electric and Magnetic Field Devices for Stimulation of Biological Tissues

Published on: May 15, 2021

Design Principles for EMAT Coils Based on Lorentz Force.

Jhon Padilla1, Daniel Bernal1, Mauricio Barrios Castellanos2

  • 1Corporación para la Investigación de la Corrosión, Piedecuesta 681011, Colombia.

Sensors (Basel, Switzerland)
|June 26, 2026
PubMed
Summary
This summary is machine-generated.

This study presents a unified methodology for designing Electromagnetic Acoustic Transducer (EMAT) coils for non-destructive testing. It integrates coil selection, design, simulation, and validation for thickness measurement and crack detection applications.

Keywords:
EMATNDTultrasound

Related Experiment Videos

Last Updated: Jun 27, 2026

Electric and Magnetic Field Devices for Stimulation of Biological Tissues
13:29

Electric and Magnetic Field Devices for Stimulation of Biological Tissues

Published on: May 15, 2021

Area of Science:

  • Materials Science and Engineering
  • Non-Destructive Testing (NDT)
  • Electromagnetics

Background:

  • Electromagnetic Acoustic Transducer (EMAT) technology is crucial for materials testing in various industries.
  • Designing effective EMAT coils is a key challenge, requiring careful selection and dimension calculation based on inspection needs.

Purpose of the Study:

  • To develop and present a comprehensive methodology for selecting, designing, and implementing EMAT coils based on Lorentz Force.
  • To integrate coil selection, dimensional design, simulation, and experimental validation into a single workflow for EMAT applications.

Main Methods:

  • Investigated four Lorentz-force coil designs: PCB spiral (CSPCB), 3D-printed spiral (CS3D), PCB meander-line (CMPCB), and 3D-printed meander-line (CM3D).
  • Detailed key design parameters including turns, radii, track width, spacing, meander length, and inter-trace distance.
  • Utilized COMSOL Multiphysics for simulating angular radiation patterns based on von Mises stress and conducted experimental validation of polar radiation patterns.

Main Results:

  • Simulated and experimentally measured polar radiation patterns for the four EMAT coil designs at various frequencies (500 kHz, 1.9 MHz, 4 MHz).
  • Achieved maximum amplitudes of 32.2, 46.4, 47.9, and 10.6 mV for CSPCB, CS3D, CMPCB, and CM3D, respectively.
  • Demonstrated consistent agreement between simulated and measured lobe shape and directivity, validating the coil designs.

Conclusions:

  • The presented methodology offers a unified approach for EMAT coil design and implementation.
  • The study provides insights into EMAT coil operation using an analogy with radio frequency antennas and radiation patterns in solid materials.
  • The validated coil designs are suitable for applications like thickness measurement and crack detection in materials testing.