基于激光尾波加速的涡轮叶片高能X射线CT

郭博; 刘得翔; 吴双华; 马跃; 华剑飞; 鲁巍

doi:10.11884/HPLPB202133.210201

基于激光尾波加速的涡轮叶片高能X射线CT

doi: 10.11884/HPLPB202133.210201

郭博^1,,
刘得翔¹,
吴双华¹,
马跃²,
华剑飞¹,
鲁巍^1, ,

1.
清华大学工程物理系，北京 100084
2.
北京量子信息科学研究院技术与产业开发中心，北京 100193

基金项目: 清华大学自主科研计划资助项目

详细信息

作者简介:
郭　博（1992—），男，博士，博士后，从事激光尾波加速驱动射线源研究

通讯作者:
鲁　巍（1977—），男，博士，教授，从事激光尾波加速研究

中图分类号: TG115.28
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出版历程
- 收稿日期: 2021-05-25
- 修回日期: 2021-07-05
- 网络出版日期: 2021-07-13
- 刊出日期: 2021-07-15

Micro-focus computed tomography for turbine blade based on all-optical bremsstrahlung source

Guo Bo^1
,,
Liu Dexiang¹,
Wu Shuanghua¹,
Ma Yue²,
Hua Jianfei¹,
Lu Wei^{1
, ,}

1.
Department of Engineering Physics, Tsinghua University, Beijing 100084, China
2.
Technology Transfer and Industrialization Center, Beijing Academy of Quantum Information Sciences, Beijing 100193, China

摘要

摘要:
发展微焦点高能X射线源技术是实现高精度高能工业CT突破的关键，基于激光尾波加速驱动高能轫致辐射源开展了微焦点高能X射线源产生以及对涡轮叶片高能CT成像研究。利用一台20 TW钛蓝宝石超快超强激光器，通过电离注入的方式获得了（140±44）pC的高能电子束，并使用1.5 mm厚钨靶产生了累积源尺寸为25 μm的高能轫致辐射X射线。利用该微焦点高能X射线源，采用基于压缩感知的CT重建算法，在获取较少角度投影（31个角度）的情况下，获得了对涡轮叶片叶榫结构的CT重建。
- 激光尾波加速 /
- 微焦点X射线源 /
- 全光轫致辐射源 /
- 高能工业CT /
- 电离注入
Abstract:
Computed tomography is a major technique for nondestructive detection of internal defects of dense materials and large-size devices. It is widely used in material science, railway, aerospace, national defense, military industry and other industries. At present, conventional high-energy industrial computed tomography system uses the X-ray source based on traditional thermionic RF electron gun, which can only provide millimeter source size, thus limiting its imaging spatial resolution. A high-energy micro-focus X-ray source is the key means to realize high-resolution high-energy industry computed tomography. As an emerging accelerator technology, the laser wakefield accelerator is a promising candidate for the micro-focus high-energy industrial computed tomography. This article reports experimental results of a micro-focus X-ray source based on laser wakefield acceleration and a computed tomography for a turbine blade. Using a 20 TW Ti: sapphire laser system, an electron beam with a charge of (140±44) pC is generated through ionization-induced injection, and then an all-optical bremsstrahlung X-ray source with an accumulated source size of 25 μm is obtained by using a 1.5 mm tungsten target. Using this source, a preliminary compressed-sensing-based computed tomography for a turbine blade is performed.
- laser wakefield acceleration /
- micro-focus X-ray source /
- all-optical bremsstrahlung source /
- high-energy industry computed tomography /
- ionization-induced injection

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图 1 实验架设示意图

Figure 1. Schematic layout of the experiment

下载: 全尺寸图片幻灯片

图 2 连续30发电子束能谱测量结果

Figure 2. Measured electron spectra for 30 consecutive shots

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图 3 连续100发全光轫致辐射累积能谱以及累积源尺寸测量结果

Figure 3. Measured accumulated spectrum and accumulated source size of all-optical bremsstrahlung radiation for 100 consecutive shots

下载: 全尺寸图片幻灯片

图 4 对涡轮叶片叶榫结构的CT重建结果

Figure 4. CT reconstructions of the turbine blade

下载: 全尺寸图片幻灯片

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