Optimization algorithms for ultrasonic array Imaging in homogeneous anisotropic steel components with unknown properties - CentraleSupélec Access content directly
Journal Articles NDT & E International Year : 2020

Optimization algorithms for ultrasonic array Imaging in homogeneous anisotropic steel components with unknown properties

Abstract

In this paper, we investigate the ability of an adaptive ultrasonic method to image point-like reflectors inside anisotropic and homogeneous nuclear steels with unknown properties, such as V-shape welds or cladded components. The optimization scheme combines the Total Focusing Method (TFM) imaging algorithm with a customized gradient ascent method to improve both the quality and the reliability of ultrasound images. A statistical analysis of its robustness is performed with simulated echoes and using a surrogate model to speed up the computation times of the TFM images. Then, the optimization procedure is evaluated with several experimental cases and provides highly enhanced images with a 5 MHz array. The positioning of the artificial defects of 2.0 mm diameter is estimated with less than 1 mm error with respect to their actual position, and the signal-to-noise ratio is increased by up to 10 dB. The elastic properties are also estimated with less than 10% error when compared to their actual values.

Dates and versions

hal-02475497 , version 1 (12-02-2020)

Identifiers

Cite

Corentin Ménard, Sebastien Robert, Roberto Miorelli, Dominique Lesselier. Optimization algorithms for ultrasonic array Imaging in homogeneous anisotropic steel components with unknown properties. NDT & E International, 2020, 116, pp.102327. ⟨10.1016/j.ndteint.2020.102327⟩. ⟨hal-02475497⟩
119 View
0 Download

Altmetric

Share

Gmail Facebook X LinkedIn More