Abstract
The guided waves based imaging techniques have been intensely developed in recent years as quick and accurate NDT solutions for various types of plate structures. One of the more attractive imaging methods is the local wavenumber spectroscopy, which exploits the dispersive nature of the guided waves to detect local thinning, corrosion or delamination type defects. The method paired with the non-contact excitation and detection of guided waves, using laser techniques, is an efficient solution for fast examination of large areas of plate-like structures. In this paper, we present the application of a laser-based system using local wavenumber estimation (LWE) method as a defect evaluation technique for a multi-thickness CFRP sample with multiple simulated damages. The examined specimen is excited using an Nd:YAG laser and the resulting ultrasound wave field is measured using a scanning laser Doppler vibrometer (SLDV). Data processing using the LWE algorithm produces two dimensional maps, where different plate thicknesses and simulated damages can be clearly visible.
How to Cite:
Spytek, J. ., Mrówka, J. ., Dziedziech, K. . & Pieczonka, ?. ., (2019) “Non-contact laser-based damage detection in composite laminates using local wavenumber estimation”, Review of Progress in Quantitative Nondestructive Evaluation .
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