NDTnet 1998 Aug, Vol.3 No.8

Abstract

Holography, along with other coherent optical techniques, has already been proved to be an effective technique in non-destructive testing of composites. One of the difficulties of holographic non-destructive testing is finding the stressing technique able to produce singularities in the strain state at the surface of the object under test. Furthermore, the practical implementation of holographic testing needs careful optimisation of stressing techniques in order to differentiate between different defect types. While preserving the basic functionalities of classical holographic systems, the use of phase-shifted electronic holography digital processors enlarge the range of possible stressing procedures, by its intrinseque real-time nature. Another interest lies in the possibility to couple several different modules to the same phase-shifting image processor. Our laboratory's experience shows that coupling a holographic module and a fringe-projection module to the same testing system results in an increased displacement measuring range as well as in new possible stressing techniques. The result is a more-effective testing, extending the range of this non-destructive technique. Real-time observation during the thermal stressing of thick composite plates, for example, allows for detecting defects otherwise difficult to detect. Several practical examples are presented.

Abstract Source:
Preview of Abstracts, International Conference on Advanced Materials - 1998, Hurghada, Egypt, 15 - 18 December 1998

Full-Text Source:
International Conference on Advanced Materials - 1998, Hurghada, Egypt, 15 - 18 December 1998

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