Working Principle

  • A steady magnetic field is created by the PEC probe transmitter coils
  • The time duration of this magnetic field is function of the object material thickness
  • This magnetic field is suddenly “switch-off” once uniform within the object material
  • Now Pulsed Eddy Currents are generated in the object material to oppose to the magnetisation change
  • These Pulse Eddy Currents diffuse until they hit the back wall and then rapidly disappear.
  • The time (τ) Pulsed Eddy Currents hit the back wall is function to the object Average Wall Thickness (AWT) and its electromagnetic properties (μσ). The PEC signal is recorded by the PEC probe receiver.