Special Section on Structural Health Monitoring: Use of Guided Waves and/or Nonlinear Acoustic Techniques

Guided ultrasonic wave testing of an immersed plate with hidden defects

[+] Author Affiliations
Abdollah Bagheri

University of Pittsburgh, Department of Civil and Environmental Engineering, Laboratory for Nondestructive Evaluation and Structural Health Monitoring Studies, Pittsburgh, Pennsylvania 15206, Unites States

Piervincenzo Rizzo

University of Pittsburgh, Department of Civil and Environmental Engineering, Pittsburgh, Pennsylvania 15206, United States

Opt. Eng. 55(1), 011003 (Aug 05, 2015). doi:10.1117/1.OE.55.1.011003
History: Received May 6, 2015; Accepted June 9, 2015
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Abstract.  This paper presents the results of an experimental study in which guided ultrasonic waves are used for the contactless nondestructive testing of a plate immersed in water. In the experiment, narrowband leaky Lamb waves are generated using a focused transducer and are detected with an array of five immersion sensors arranged in a semicircle. The ultrasonic signals are processed to extract a few damage-sensitive features from the time and frequency domains. These features are then fed to an artificial neural network to identify the presence of hidden defects, i.e., defects devised on the surface of the plate not facing the probing system. We find that the noncontact inspection system and the signal processing technique enable the classification of the plate health with a success rate >75%.

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© 2016 Society of Photo-Optical Instrumentation Engineers

Citation

Abdollah Bagheri and Piervincenzo Rizzo
"Guided ultrasonic wave testing of an immersed plate with hidden defects", Opt. Eng. 55(1), 011003 (Aug 05, 2015). ; http://dx.doi.org/10.1117/1.OE.55.1.011003


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