Eddy Current Testing for Education

In the ET module, two types of computation are available: beam computation and inspection simulation.


Field Computation

The capabilities of the field computation include:

  • Planar (potentially multilayer) and Cylindrical component geometries
  • Ferromagnetic or non-ferromagnetic materials
  • Surface coil (air core or cylindrical ferrite core), bobbin coil configuration
  • Variable operational frequency
  • Computes electromagnetic fields, impedance diagram and lift-off signal


Examples of simulations

The ET field computation module of CIVA Education can help you make visible what is a bit hidden and looks complex in this electromagnetic technique:


  • Illustrate the Eddy Current penetration depth and observe the impact of the frequency, the material but also the sensor size on the actual penetration.


  • Visualize the action zone of an ET sensor.
  • Observe Eddy Current distribution in a tube or a solid bar.


  • Understand and interpret Impedance diagram.


  • See the influence of a ferrite core on the field induced by an ET sensor.
  • Explain the lift-off signal and its potential consequence on calibration procedure.


  • And many other ideas...


Inspection simulation

The features available in the ET inspection simulation module are:

  • Planar and Cylindrical component geometries
  • Conductive non-ferromagnetic materials
  • Surface coil (air core or cylindrical ferrite core), bobbin coil configuration
  • Simulation of cylindrical hole in tubes or rectangular notch in planar component
  • Variable operational frequency
  • Absolute or Differential mode


Examples of simulations

The ET inspection simulation module of CIVA Education can reproduce typical Eddy Current signals and help you in the following context:


  • Explain the main acquisition modes: separated or common functions, absolute or differential measurement.
  • Simulate classical tube inspection setup and explain the use of the phase angle for the defect characterization.
  • Illustrate signals obtained at the quadrature frequency for different defect depths in tube inspection.


  • Highlight the influence of the filling rate on the inspection sensitivity.


  • Show the impact of the inspection speed on the signal resolution for a given operational frequency.
  • Illustrate the impact of the sensor size for a given flaw on the obtained response.
  • See what happens if you apply or not the “law of similarity” on a defect signal.
  • Evaluate the impact of the material conductivity on the signal obtained for a similar defect.


  • Visualize the phase separation of lift-off and defect signal depending on the sensor and the operating frequency.
  • Etc.