用于動態(tài)材料混合實驗的 X 射線相襯成像方法

摘要：用于密度分布測量的基于透射光柵的射線相襯成像已經(jīng)開發(fā)并測試用于動態(tài)實驗應(yīng)用。Talbot-Lau X射線偏轉(zhuǎn)測量法是一種除衰減和超小角度散射之外的測量 X 射線折射的新方法，最近已開發(fā)用于靜態(tài)成像，主要用于醫(yī)療和工業(yè)應(yīng)用。為了從快速演化的系統(tǒng)中獲得密度分布，我們必須使用光斑尺寸遠大于使用連續(xù)微聚焦源的靜態(tài)成像系統(tǒng)的閃光X射線源，而且我們只能獲得一次曝光。解決了從單幅圖像、低空間分辨率系統(tǒng)測量兩種混合元素的電子密度分布的挑戰(zhàn)，并在 2018 財年末到2019年財年初，在氣體發(fā)射器上進行了首次動態(tài)實驗并得到了初步結(jié)果。在2019 財年，我們設(shè)計并建造了一款專為雷管實驗設(shè)計的新型偏轉(zhuǎn)計，以測試新技術(shù)以提高診斷的靈敏度和可靠性。

X-Ray Phase Contrast Imaging for Dynamic Material Mix Experiments

Abstract

X-ray phase contrast imaging with transmission gratings for density profile measurements has been developed and tested for dynamic experimental applications. Talbot-Lau x-ray deflectometry is a new method of measuring x-ray refraction in addition to attenuation and ultrasmall-angle scattering that has recently been developed for static imaging, primarily for medical and industrial applications. To obtain density profiles from fast-evolving systems, we must use a flash x-ray source with a spot size much larger than the continuous microfocus sources of static imaging systems, and we can obtain only a single exposure. The challenges to measuring electron density profiles of two mixed elements from a single-image, low spatial resolution system are addressed, and initial results from the first dynamic experiments with one such system, conducted on a gas launcher at the end of FY 2018 and beginning of FY 2019, are presented. In FY 2019, we designed and built a new deflectometer designed for detonator experiments to test new techniques to improve the sensitivity and reliability of the diagnostic.

文章鏈接： Clayton, Daniel J., et al. X-Ray Phase Contrast Imaging for Dynamic Material Mix Experiments, LAO-003-17, Year 3 of 3. No. DOE/NV/03624-1009. Nevada National Security Site (NNSS), North Las Vegas, NV (United States), 2021.

文章中所使用的光柵是由德國Microworks生產(chǎn)定制、生產(chǎn)的（點擊了解詳情）。