Publications
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Numerical study of a phased array-based ultrasonic polar scan to determine plane-wave reflection coefficients of plates Ghent University KU Leuven
Implications of finite sized transducers on the determination of the viscoelastic tensor of composite plates with the ultrasonic polar scan Ghent University
Detection and Localization of Delaminations in Thin Carbon Fiber Reinforced Composites with the Ultrasonic Polar Scan Vrije Universiteit Brussel
In this paper, the hybrid compliance-stiffness matrix method for simulating wave propagation in (delaminated) multilayered media with viscoelastic anisotropy has been confronted with high-quality amplitude and phase experiments on delaminated composites, obtained using the ultrasonic polar scan setup (UPS) in transmission by considering harmonic as well as pulsed ultrasound. Results are presented for multiple thin carbon/epoxy laminates with an ...
Determination of the fiber direction and the C-tensor of a UD carbon/epoxy composite by means of the ultrasonic polar scan Vrije Universiteit Brussel
The pulsed ultrasonic polar scan relies on the simple amplitude measurement of the transmitted (or reflected) sound pulse for a 2D range of oblique incidence angles. It has been conjectured in the 80's that the ultrasonic polar scan provides a unique fingerprint of the underlying elasticity tensor at the insonified material spot. Until now, that premise has not been thoroughly investigated, nor validated, despite the enormous opportunities this ...
3D simulations of a phased array ultrasonic polar scan Ghent University
The pulsed ultrasonic backscatter polar scan and its applications for NDT and material characterization Vrije Universiteit Brussel
In a conventional ultrasonic polar scan (UPS) experiment, the amplitude or time-of-flight-diffraction (TOFD) values of the transmitted and/or reflected acoustic pulse are recorded for a wide range of incidence angles, in view of gaining knowledge about the elastic properties at the insonified material spot. Here we apply the pulsed UPS technique and investigate the backscattered signal, resulting in the ultrasonic backscatter polar scan (UBPS). ...
The quasi-harmonic ultrasonic polar scan for material characterization: experiment and numerical modeling Vrije Universiteit Brussel
The conventional ultrasonic polar scan (UPS) records the transmitted amplitude of an acoustic pulse for a certain solid angle, resulting into a unique fingerprint of the local critical bulk wave angles, which relate to the local elasticity tensor at the insonified material spot. Numerical plane wave computations reveal that the use of harmonic sound, instead of sound pulses, provides a picture that exposes the leaky Lamb wave angles. For the ...
Efficient extraction of the directional wave curves from a pulsed ultrasonic polar scan experiment Vrije Universiteit Brussel
The pulsed ultrasonic polar scan (UPS) technique provides an amplitude map with characteristic contours reflecting the critical bulk wave angles, which relate to the mechanical stiffness of the insonified material spot. Besides these contours, additional information is captured in a UPS experiment which has particular importance for the inspection of anisotropic materials. By extensive post-processing on a single UPS experiment, we successfully ...
Extraction of bulk wave characteristics from a pulsed ultrasonic polar scan Vrije Universiteit Brussel
The pulsed ultrasonic polar scan (P-UPS) technique provides a map with characteristic contours reflecting the critical bulk wave angles, which directly relate to the in-plane elastic properties of the insonified material spot. Besides these contours, additional information is captured in a P-UPS experiment which has particular importance for the inspection of anisotropic materials. By extensive post-processing on a single P-UPS experiment, we ...