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Acoustic emission (AE) is a term used to describe the sound waves produced when a material undergoes stress (internal change), as a result of an external force.  AE is a phenomena occur in for instance mechanical loading generating sources of elastic-waves. This occur is the result of a small surface displacement of a material produced due to stress-waves generated when the energy in a material, or on its surface is released rapidly. The wave generated by the source, is of practical interest in methods used to stimulate and capture AE in a controlled fashion, for study and/or use in inspection, quality control, system feedback, process monitoring and others.


Compared to conventional inspection methods the advantages of the Acoustic Emission technique are:

  • High sensitivity.
  • Early and rapid detection of defects, flaws, cracks etc.
  • Real time monitoring
  • Cost Reduction
  • Defective area location: only critical defects provide sustainable Acoustic Emission sources.
  • Minimization of plant downtime for inspection, no need for scanning the whole structural surface.

Minor disturbance of insulation


Other method

Phased Array Ultrasonic Testing

Phased array ultrasonic systems utilized multi-element probes, which are individually excited under computer control. By exciting each element in a controlled...