Guided waves have been extensively explored in the field of Structural Health Monitoring (SHM) and Non-Destructive Testing (NDT) over many years. Guided waves are usually excited and registered by using an array of piezoelectric transducers attached to the surface of the inspected structure. However, in some cases, piezoelectric transducers cannot be used directly on the structure and noncontact wave excitation methods are preferable. This paper is a continuation of authors’ previous research on complete non-contact NDT methods in which low-cost resonant-based ultrasonic transmitters together with scanning laser Doppler vibrometer are used. The aim of the paper is the comparison of guided wave actuation ability in a composite plate by using the single ultrasonic transmitter, flat ultrasonic transmitter array and spherical ultrasonic transmitter array. Full wavefield of propagating guided waves was registered on a fine grid of points by using laser vibrometer and processed by using the wavenumber filtering method. Finally, the accuracy of delamination localization and size was estimated for each actuation setup.

Date Published: 1 April 2019
PDF: 8 pages
Proc. SPIE 10971, Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII, 109711J (1 April 2019); doi: 10.1117/12.2514017

Published in SPIE Proceedings Vol. 10971:
Nondestructive Characterization and Monitoring of Advanced Materials, Aerospace, Civil Infrastructure, and Transportation XIII
Andrew L. Gyekenyesi, Editor(s)