硬X射线焦斑环孔编码成像的理论与实验研究

doi:10.16568/j.0254-6086.201704006

核聚变与等离子体物理 ›› 2017, Vol. 37 ›› Issue (4): 404-410.DOI: 10.16568/j.0254-6086.201704006

硬X射线焦斑环孔编码成像的理论与实验研究

张美，胡华四，盛亮，王培伟，李阳，袁媛，彭博栋，周海生，李奎念

(1. 西安交通大学能动学院，西安 710049；2. 西北核技术研究所强脉冲辐射环境模拟与效应国家重点实验室，西安 710024)

收稿日期:2016-08-09 修回日期:2017-08-24 出版日期:2017-12-15 发布日期:2017-12-15
作者简介:张美(1979–)，男，内蒙古商都人，副研究员，博士研究生，从事核科学与技术研究。
基金资助:
国家自然科学基金(11275155)

Ring coded imaging for hard X-ray focal spot

ZHANG Mei, HU Hua-si, CHENG Liang, WANG Pei-wei, LI Yang, YUAN Yuan, PENG Bo-dong, ZHOU Hai-sheng, LI Kui-nian

(1. School of Energy and Power Engineering, Xi’an Jiaotong University, Xi’an 710049； 2. State Key Laboratory of Intense Pulsed Radiation Simulation and Effect, Northwest Institute of Nuclear Technology, Xi’an 710024)

Received:2016-08-09 Revised:2017-08-24 Online:2017-12-15 Published:2017-12-15

摘要/Abstract

摘要：

针对几十~百keV能量的低强度X射线焦斑源测量，建立了高探测效率环孔编码成像技术。研究给出了环孔成像效率和信噪比与环孔结构参数的关系，采用微联结的环孔结构设计并模拟了联结区尺寸对成像质量的影响，解决了环孔结构同轴成像技术难题。所建立环孔成像系统应用于Unique-II X射线焦斑源成像实验。结果表明，X射线焦斑的空间分布近似为‘马鞍’形状，而且中间部分的强度低于两侧的强度，与针孔成像结果相似，但环孔的探测效率明显高于针孔的效率。最后，分析了维纳滤波与R-L两种复原图像方法的效果。

关键词: 环孔编码成像, R-L方法图象复原, X射线焦斑

Abstract:

Ring coded imaging technology with high detection efficiency was put forward to diagnose space distribution for low intensity X-ray spot with several tens to hundred of keV. In this paper, the relations of detection efficiency and signal – noise ratio varied with the ring geometric parameters were researched. The coaxial imaging technology was resolved by employing the design of local micro joins on the ring aperture, and simulating the influence of micro joint area size on imaging quality. The ring aperture imaging system was developed and the Unique-II X-ray spot imaging experiment was implemented. The results show that the space distribution of the X-ray spot is approximate a ‘saddle’ shape, and the intensity in the middle part is lower than both sides along the long axis of the elliptical surface; this conclusion is consistent with pin-hole image; the detection efficiency of ring is evidently more than that of pin. Finally, the effects of and the R-L method and Wiener method used to restore the image are analyzed.

Key words: Ring coded imaging, Richardson-Lucy method image restoration, X-ray focal spot

中图分类号:

TN762

张美，胡华四，盛亮，王培伟，李阳，袁媛，彭博栋，周海生，李奎念. 硬X射线焦斑环孔编码成像的理论与实验研究[J]. 核聚变与等离子体物理, 2017, 37(4): 404-410.

ZHANG Mei, HU Hua-si, CHENG Liang, WANG Pei-wei, LI Yang, YUAN Yuan, PENG Bo-dong, ZHOU Hai-sheng, LI Kui-nian. Ring coded imaging for hard X-ray focal spot[J]. NUCLEAR FUSION AND PLASMA PHYSICS, 2017, 37(4): 404-410.

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硬X射线焦斑环孔编码成像的理论与实验研究

Ring coded imaging for hard X-ray focal spot

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