Tangential Eddy Current Array

Tangential eddy current array is a specific ECA coil arrangement developed for the inspection of ferrous materials. TECA

TECA allows detecting and sizing surface-breaking cracks in carbon steel.

“Tangential” refers to the orientation of the coils and eddy currents induced in the material. Eddy currents flow parallel to the surface of the test piece. When a crack is open to the surface, eddy currents are forced to dive under it, thus reducing the density of eddy currents at the surface. TECA is using this density variation to provide the depth of the crack being examined.

TECA can be used in the presence of non-magnetic coating (several mm thick). However, it is designed for carbon steel only and is not suitable for non-ferrous materials.

Replacing Traditional NDT methods with TECA

Tangential eddy current array is increasingly being used to replace traditional methods like MT (MPI), PT (LPI) and ACFM for surface inspections, increasing speed of inspection, reducing downtime and eliminating any need for harsh chemicals.



  • Increased inspection speeds and detection capabilities
  • Less operator dependant (fewer false calls reported)
  • C-Scan imaging allows for an easier assessment of the results meaning less experienced technicians can perform acquisitions
  • Environmentally friendly
  • Result traceability & post process analysis