Using 2-D arrays for sensing multimodal Lamb waves

Marcus Engholm; Tadeusz Stepinski

doi:10.1117/12.847607

8 April 2010 Using 2-D arrays for sensing multimodal Lamb waves

Marcus Engholm, Tadeusz Stepinski

Proceedings Volume 7649, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2010; 764913 (2010) https://doi.org/10.1117/12.847607
Event: SPIE Smart Structures and Materials + Nondestructive Evaluation and Health Monitoring, 2010, San Diego, California, United States

Abstract

Monitoring structural integrity of large planar structures requires normally a relatively dense network of uniformly distributed ultrasonic sensors. A 2-D ultrasonic phased array with all azimuth angle coverage would be extremely useful for the structural health monitoring (SHM) of such structures. Known techniques for estimating direction of arriving (DOA) waves cannot efficiently cope with dispersive and multimodal Lamb waves (LWs). In the paper we propose an adaptive spectral estimation technique capable of handling broadband LWs sensed by 2-D arrays, the modified Capon method. Performance of the technique is evaluated using simulated multiple-mode LWs, and verified using experimental data.

Citation Download Citation

Marcus Engholm and Tadeusz Stepinski "Using 2-D arrays for sensing multimodal Lamb waves", Proc. SPIE 7649, Nondestructive Characterization for Composite Materials, Aerospace Engineering, Civil Infrastructure, and Homeland Security 2010, 764913 (8 April 2010); https://doi.org/10.1117/12.847607

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