Understanding Acoustic Emission Testing- Reading 1 Part B-A

16.3 Theoretical Considerations
When an acoustic emission event occurs at a source with the material, due to
(1) inelastic deformation or (2) to cracking, the stress waves travel directly
from the source to the receiver as body waves. Surface waves may then arise
from mode conversion. When the stress waves arrive at the receiver, the
transducer responds to the surface motions that occur.
It should be noted that the signal captured by the recording device may be
affected by:
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the nature of the stress pulse generated by the source,
the geometry of the test specimen, and
the characteristics of the receiver,
making it difficult to interpret the recorded waveforms.
Charlie Chong/ Fion Zhang