NDTnet 1998 Aug, Vol.3 No.8

Full-Text - Abstract

Holographic interferometry has been used for years in the mechanical domain and has proved its ability to provide both qualitative and quantitative information on parts deformation. Being a global technique and having a high sensitivity, it is well suited to the analysis of parts behaviour under mechanical or vibration loading. Yet more practical tools are needed to match industrial applications. In this EC funded project called Pulsed Digital Holography and Shearography, the purpose is to develop a pulsed digital holographic system that will integrate the last developments on pulsed laser, opto-electronic devices, acquisition and analysis software. This system should be able to operate under any industrial environment without needing special conditions. Foreseen applications are in the aerospace, automotive and nuclear fields.

The first developments achieved have been tested on simple cases representative of end user requirements. The capabilities of recording short events with large displacement amplitude have been demonstrated by monitoring shocks (see figure below).
Acquisition and analysis software has been developed to fit the needs of the end-users. Further tests concern static and dynamic tests. They range from non destructive testing of aeronautical and spatial structures with qualitative analysis to acquisition of part deformations during mechanical tests with highly specialised quantitative analysis. One emerging application of such tests is making analysis tools available to comfort or complement finite element models. The parts tested cover metallic and composite structures with surfaces up to 1 m² and more. Results of quantitative analysis on static and dynamic tests will be shown.

Fig.: Propagation of a shock wave in a plate

Abstract Source:
Book of Abstracts, 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN: 87-986898-0-00

Full-Text Source:
Proceedings of the 7th European Conference on Non-Destructive Testing, 26-29 May 1998, ISBN:

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