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308 Matching spectroscopy with the ultrasonic polar scan for advanced NDT of composites
* 1 , 1 , 2 , 2 , 2 , 2 , 1
1  Department of Materials, Textiles and Chemical Engineering, Ghent University, 9052 Zwijnaarde, Belgium
2  Wave Propagation and Signal Processing (WPSP), Department of Physics, KU Leuven Kulak, 8500 Kortrijk, Belgium


The Pulsed Ultrasonic Polar Scan (P-UPS) is a powerful technique for characterizing anisotropic materials like fiber reinforced plastics. A time-domain analysis of the ultrasonic signals yields amplitude and time-of-flight polar diagrams that provide a fingerprint of the local stiffness properties. Though, this simple analysis ignores a lot of information contained in the ultrasonic signals. In this study, we propose to use the P-UPS technique in combination with the spectroscopic analysis of broadband pulses, to obtain plane wave transmission spectra for all in-plane polar angles. This allows us to combine on one hand the strengths of the P-UPS technique, that does not require a priori knowledge about the sample anisotropy, and on the other hand the frequency-domain analysis that utilizes information contained in the broadband pulses.

Keywords: Ultrasonic Polar Scan; Spectroscopy; Broadband