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Erschienen in:
2013 | OriginalPaper | Buchkapitel
Inspection of Underwater Metallic Plates by means of Laser Ultrasound
verfasst von : P. Rizzo, E. Pistone, P. Werntges, J. Han, X. Ni
Erschienen in: Nondestructive Testing of Materials and Structures
Verlag: Springer Netherlands
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Abstract
Guided Ultrasonic Waves (GUWs) are increasingly considered in the nondestructive testing of engineering systems. This paper shows a non-contact laser/immersion transducer system for the detection of damage in submerged structures. A pulsed laser was used to generate stress waves in an aluminium plate immersed in water; a pair of immersion transducers was used to detect the signals. The waveforms were processed using wavelets to extract information about the attenuation of the propagating modes. Damage was simulated by devising a notch and a circle on the face of the plate exposed to the probing system.