Acoustic emission (UT) The acoustic emission technique (AET) is considered quite unique among the non-destructive testing (NDT) methods.AET is usually applied during loading, while most others are applied before or after loading of a structure. The acoustic emission (AE) method should be considered to be a “Passive” non-destructive technique, because it is only able to identify defects developing during the test. Acoustic Emission (AE) is the class of phenomena whereby an elastic wave, in the range of ultrasound usually between 20 KHz and 1 MHz, is generated by the rapid release of energy from the source within a material. The elastic wave propagates through the solid to the surface.
There are two distinct qualitative types of acoustic emission Techniques:
Burst and Continuous
- Burst:- Burst is a type of emission related to individual events occurring in a material that results in discrete emission signals acoustic
- Continuous:- Continuous is a type of emission that related to time overlapping and/or successive emission events from one or several sources that results in sustained signals