Materials Engineering, Evaluation, and Inspection

Electromagnetic Testing

Spectrum Electromagnetic Testing technologies involve test methods that use magnetism and electricity to detect or measure fractures, faults, corrosion or other damage in conductive materials. Analyses of specific magnetic properties and component geometries are used to identify the optimum Electromagnetic Testing method.

Electromagnetic testing methods include:

Eddy Current Testing (ET)

Spectrum uses the Eddy Current method to detect flaws in pipe and tubing by inducing a strong external magnetic field around the subject material. Discontinuities appear as variations in the eddy currents produced, which are indicated by a signal in the testing device. ET is especially beneficial in detecting discrepancies in nonferrous materials such as heat exchanger tubes, condensers, boilers and tubing.


  • Metals, alloys and electro-conductors
  • Sorting materials
  • Surface and slightly subsurface flaws can be detected
  • Used on tubing, wire, bearings, rails, non- metal coatings, aircraft components, turbine blades and disks, automatic transmission shafts


  • Requires customized probe although non- contacting it requires close proximity of probe to part
  • Low penetration (typically 5 mm)
  • False indications due to uncontrolled parametric variables