Images formed by laser metrology of complex substructures: new concept in non-destructive inspection

Le résumé fourni par la source

The present paper presents the results of the remote recording, analysis and study of defect detection with laser Doppler vibrometry (LDV) coupled with shockwave excitation. The non-destructive inspection (NDI) procedure employed is based on the vibrational excitation and evaluation of test objects with defects of both known and unknown parameters. Additionally the potential advantages are presented of using whole field laser Doppler vibrometry (WFLDV) being developed. To evaluate the procedure the technique has been applied to a number of different samples that have been tested by this system of NDI. The test samples included multilayer and sandwich composites, ceramic and aluminium structures containing in service occurring or preprogrammed defects. Additionally included is an example of corrosion occurring at second and third layers in an airframe structure together with an example, manufactured to simulate metal loss, by introducing a 'defect' represented by a machined thickness removal of 2% at the central part of the test object.

Ce résumé expose les affirmations des auteurs. BNTIC ne l’interprète pas comme une validation indépendante des résultats.