Abstract This study explores the ability of a hard K α x-ray source (17.48 keV) produced by 10 TW class laser system operated at high temporal contrast ratio and repetition rate for phase imaging. For demonstration, parametric based on known object (PET films) shows clear evidence feasibility imaging over large range intensity target (from ~10 17 W/cm 2 to 7.0 × 18 ). To highlight this result, comparison raw retrieved images biological (a wasp) is done different intensities below...

X-ray imaging is widely used in non-destructive testing dedicated to industry, medical or security domain.In aircraft production, the aerospace industry increasingly integrates carbon fibre reinforced polymers (CFRP), which may develop defects from operational wear, like lightning strikes.To robustly characterize density changes resulting induced damage CFRP, multilateral shearing interferometry (MLSI) -a phase technique -have been incorporated on a laboratory bench.Indeed, such method...

We present a graphical tool that we call "confidence map". It allows to evaluate locally the quality of phase image retrieved from measurement its gradients. The is primarily used alert observer presence artifacts could affect his interpretation image. can also be optimize imager since it associates cause with creation each artifact: dislocation, under-sampling and noise. An illustration use confidence map presented, based on microfocus X-ray tube using multilateral shearing interferometry,...

X-ray grating-based techniques often lead to artifacts in the phase retrieval process of objects presenting very fast spatial transitions or sudden jumps, especially field non-destructive testing and evaluation. In this paper, we present a method that prevents emergence by building an interferogram corrected from any variations object intensity given as input process. For illustration, is applied carbon fiber specimen imaged microfocus tube single 2D grating. A significant reduction has been...

We present an in-situ energy dispersive X-ray fluorescence measurement of the content Chromium and Nickel in fumes produced by selective laser melting on Inconel 625 powder. Significant variations intensities Kα lines were evidenced as a function power, lasing velocity chamber atmosphere. Calibration has been carried out using Monte–Carlo particle transport simulations allowed to obtain quantitative estimate mass fraction fumes. The experimental data compared predictions analytical...

The purpose of this paper is to show that the Shack-Hartmann wavefront sensor (SHWFS) gives access more derivatives than two orthogonal classically extracted either by estimating centroid or taking into account first harmonics Fourier transform. demonstration based on a simple model SHWFS, microlens array as whole and linking SHWFS multi-lateral shearing interferometry family. This allows for quality these additional derivatives, paving way new reconstruction techniques involving cross...

Grade2XL is a European project funded by the H2020 program that gathers 21 academic and industrial partners. Started in March 2020 for 4 years, principal objective to print extra-large structures using WAAM (Wire Arc Additive Manufacturing) method with complete control of fabrication process. Since relatively new technology printing large specimens, it important develop quality assurance methods can be used during once structure has been built, which focus CEA List project. Regarding applied...

X-ray imaging is widely used in non-destructive testing dedicated to industry, medical or security domain. In aircraft production, the aerospace industry increasingly integrates carbon fibre reinforced polymers (CFRP), which may develop defects from operational wear, like lightning strikes. To robustly characterize density changes resulting induced damage CFRP, multilateral shearing interferometry (MLSI) – a phase technique have been incorporated on laboratory bench. Indeed, such method...

Getting complementary physical information from a single image acquisition is particularly valuable for materials analysis. Grating based X-ray Phase Contrast Imaging (XPCI) methods allow decoupling attenuation, phase and scattering information. However, the extraction processes can easily suffer artefacts, which detrimental to implement this imaging technique in societal applications. In paper, we demonstrate that grating XPCI provide robust measurement complex such as damaged composites....

Le contraste de phase en imagerie par rayons X permet voir des détails structures dans les matériaux peu absorbants. Plusieurs techniques existent mais l’interférométrie à décalage multilatérale (IDML) une mesure simultanée gradients selon plusieurs directions un post-traitement le domaine Fourier. Dans cet article nous présentons résultats cette méthode sur deux types matériaux, polymères issus fabrication additive biosourcée et composites carbonés utilisés l’aéronautique. Des outils...

Cette communication présente des résultats de spectrométrie par fluorescence X à dispersion d’énergie (ED-XRF) acquis durant procédés fabrication additive métallique. technique caractérisation sans contact et non-destructive est appliquée deux techniques Le but renforcer la maitrise ces répondre exigences contrôle qualité. Deux cas d’études sont abordés, l’un concernant mesures effectuées sur échantillons possédant une gradation composition chimique l’alliage, l’autre présentant le...

The interest towards developing intense and compact ultrashort x-ray sources is motivated both by scientific applications like time-resolved X-ray diffraction or absorption spectroscopy[1] societal such as phase contrast imaging for biology medicine[2]. At LP3 laboratory, objectives are today achievable thanks to development of hard <tex xmlns:mml="http://www.w3.org/1998/Math/MathML" xmlns:xlink="http://www.w3.org/1999/xlink">$\mathrm{K}\upalpha$</tex> pulsed laser plasma source generated...

A 100 Hz sub-picosecond K α x-ray source (17.48 keV) with a very high photon flux is thoroughly optimized to make phase contrast imaging in large range of laser intensity up 10 19 W/cm2.

In this paper, we propose a model dedicated to X-ray phase contrast imaging, which is well adapted the characterization or inspection of low attenuating samples. We introduce hybrid approach that combines ray-tracing step with wave propagation computation. The mathematical basis our described and present comparison experimental results, for case an optical fiber sample, in framework free-propagation technique. extension 3D imaging proposed on simulated data using grating based technique more...