acoustic emission (plural acoustic emissions)
- (uncountable, engineering, acoustics) A phenomenon wherein external stimuli such as mechanical loading generate physical vibrations.
- (countable, engineering) A physical vibration caused by sudden movement within a material subjected to physical stress, often symptomatic of a defect.
1990, Adrian A. Pollock, “Acoustic Emission Inspection”, in ASM Handbook, 17th ed. edition, ISBN 0871700239, page 287:
- Acoustic emissions are only generated when some abrupt and permanent change takes place somewhere in the material.