Digital shearograohy has demonstrated great potential in revealing defects in objects especially in detecting delaminations in composite materials. It is gaining more and more acceptance by automotive and aerospace industries in the field of nondestructive testing (NDT) of composite materials. A key optical component used in shearography is a shearing device in which the shearing amount, shearing direction and under the most cases the phase shift technique are determined and introduced. The paper displays different shearing devices. A theoretical analysis and an experimental comparison between them are demonstrated. The new measuring system of digital shearography with a capability for simultaneous measurement both in x and y directions and new concept for shearing amount, i.e. the critical shearing amount at which the measuring setup has a maximal sensitivity, are developed and introduced. The measuring sensitivity, the manner of load and illumination are discussed in details. The recent developments of digital shearography for NDT and its potentials, limitations and application are demonstrated by examples of NDT for different materials.
Digital shearography for nondestructive evaluation and application in automotive and aerospace industries
Digitale Scherographie zur zerstörungsfreien Bewertung und Anwendung in der Automobil- und der Luftfahrtindustrie
2004
8 Seiten, 11 Bilder, 15 Quellen
(Nicht paginiert)
Conference paper
Storage medium
English
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