Acoustic Emmision Technology

This type of NDE is one of most prefferred method when option of RT, UT can't be done due to some restrictions.

As is well known, acoustic emission monitoring is a nondestructive means of evaluation which passively "listens" to sound waves generated by stresses within a material. The out-of-plane displacements created by the sound waves (typically on the order of picometers or smaller) are detected and converted to a voltage by piezoelectric transducers; computerized equipment is used to measure and record the resulting voltage vs. time information.