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9 March 2014 On the processing of leaky guided waves propagating in immersed plates
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We present a non-destructive inspection method for the structural health monitoring of underwater structures. A laser operating at 532 nm is used to excite leaky guided waves on an aluminum plate immersed in water. The plate has a few artificial defects namely vertical notch, horizontal notch, corrosion, and small hole. An array of five immersion transducers arranged in half-circle is used to detect the propagating waves. A signal processing technique is implemented to assess the presence of damage; the method is based on continuous wavelet transform to extract a few damagesensitive features fed to an artificial neural network for damage classification. The experimental results show that the proposed system can be employed for the inspection of underwater plates.
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Abdollah Bagheri, Piervincenzo Rizzo, and Elisabetta Pistone "On the processing of leaky guided waves propagating in immersed plates", Proc. SPIE 9064, Health Monitoring of Structural and Biological Systems 2014, 90640W (9 March 2014);

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