Skip to Main content Skip to Navigation
Theses

Mesure des défauts de forme de microballons par imagerie X : exploitation du phénomène de constraste de phase

Abstract : Since 1996, the CEA's Military Applications Division (DAM) guaranties the reliability and safety of Frenchnuclear warheads without conducting any further nuclear test. It relies particularly on major facilities forvalidating the equations used to model the functioning of nuclear weapons. Among them, the Megajoule Laser(LMJ) allows studying experimentally, as "laboratory" measurements, representative phenomena gatheringtime·scale and space distribution of extreme temperature and pressure conditions. These experiments are ledwith millimetric objects named microshells. Before experimenting them, these microshells are characterizedusing X·rays technics. On the radiographies, one can observe straight gray level variations which are generatedby the phase contrast phenomenon added to x·rays absorption contrast. Information included in this formercontrast is used to sharply determine microshell's edges. The delimiting points of these edges are thenintegrated as input data to compute microshell's surface form defects. A study is also led to determine theoptimized number of radiographies needed for estimating the search defect modes. Measurement uncertainty isfinally evaluated, thus giving a complete microshell's characterization.
Complete list of metadatas

https://tel.archives-ouvertes.fr/tel-02451690
Contributor : Abes Star :  Contact
Submitted on : Thursday, January 23, 2020 - 12:40:09 PM
Last modification on : Friday, January 24, 2020 - 2:01:58 AM
Long-term archiving on: : Friday, April 24, 2020 - 2:03:17 PM

File

These_Dutto.pdf
Version validated by the jury (STAR)

Identifiers

  • HAL Id : tel-02451690, version 1

Citation

Vincent Dutto. Mesure des défauts de forme de microballons par imagerie X : exploitation du phénomène de constraste de phase. Traitement du signal et de l'image [eess.SP]. Université de Toulon, 2018. Français. ⟨NNT : 2018TOUL0013⟩. ⟨tel-02451690⟩

Share

Metrics

Record views

448

Files downloads

34