BASIC PRINCIPLES OF ACOUSTIC EMISSION TOMOGRAPHY

摘要

The present paper describes the basic principles of acoustic emission (AE) tomography. This method uses acoustic emission events as point sources and combines the usual iterative localization algorithm of AE testing with algorithms for travel time tomography like ART (algebraic reconstruction technique), The procedure is equivalent to the solution of the generalized inverse localization problem in locally isotropic heterogeneous media and leads to a new imaging technique where in addition to the source positions the volume of the specimen is visualized in terms of a locally varying wave speed distribution. It is shown by numerically obtained data sets that the algorithm leads to a more accurate localization of acoustic emission events and offers totally new perspectives for acoustic emission imaging and for acoustic tomography in general.