(under subclass 584) Subject matter for sensing mechanical sonic-type waves emitted by flaws and other anomalies which generally occur in the test body in the early stages of the flaw or other anomaly.
(1) Note. An acoustic emission is a generally inaudible noise caused by minute changes in a material or object due to stresses imposed thereon. Thus, when a material undergoes a permanent deformation, it will generate a sound which may be monitored by ultrasensitive means.
SEE OR SEARCH THIS CLASS, SUBCLASS:
801, for similar subject matter in combination with means for applying stress to the test object to induce strain and accompanying acoustic emission.
