P4G-3 An Efficient Measurement Strategy for Plate Wave Diffraction Tomography

Abstract

This paper reconsiders the implementation details of plate wave diffraction tomography for quantitative nondestructive evaluation of flat isotropic plates. Compared to previous implementations, the approach presented here requires substantially fewer individual wave field measurements, while being also more flexible with respect to the source-receiver configuration geometry. This is achieved 1) by assuming the damage location is known, since this can be efficiently determined using other guided wave techniques and 2) by considering only far-field scatter measurements, which are usually possible if the damage location is already known prior to the imaging. Using numerical simulations of plate wave scattering due to cylindrical damage obstacles of varying size and severity, both the quantitative performance and measurement efficiency of the new implementation strategy are demonstrated.