强激光与粒子束, 2011, 23 (8): 2047, 网络出版: 2011-09-20
闪光照相中MeV级网栅的设计
Design of MeV anti-scatter grid in flash radiography
MeV级网栅 散射 蒙特卡罗模拟 闪光照相 MeV anti-scatter grid scatter Monte Carlo simulation flash radiography第23卷第8期强激光与粒子束Vol.23 No.8
摘要
通过理论分析,确定了MeV级多孔网栅的设计目标、拟采用的照相布局及图像接收系统。在此基础上,通过蒙特卡罗模拟和理论分析,确定了网栅的主要参数,包括网栅厚度、孔径与孔间距和W薄片厚度,并研究了加工误差和非理想照相因素对网栅性能的影响,最后给出了原理样机的设计参数。针对原理样机开展了数值模拟,利用模拟图像进行了网栅图像修补与插值等图像预处理工作,初步验证了原理样机在实际应用中的可行性。
Abstract
Scattered radiation, which seriously decreases the precision of image reconstruction in high energy flash X-ray radiography, can be largely diminished by anti-scatter grid. The design aim of MeV anti-scatter grid is firstly presented, and the radiographic system layout and the imaging system are given using theoretic analysis. Then parameters of anti-scatter grid, such as the total thickness, aperture and space between holes, and the thickness of W thin foil with small holes, are detailed using Monte Carlo simulation and analysis. Effects of the machining error and imperfect alignments of radiographic components on the performance of MeV anti-scatter grid are also discussed, and design parameters of the prototype of anti-scatter grid are presented. With the designed anti-scatter grid, the calculated radiograph using Monte Carlo code are preprocessed, such as image mend and image restoration and interpolation. It is shown that the designed prototype can be used in high energy flash X-ray radiography.
刘军, 刘进, 管永红, 景越峰. 闪光照相中MeV级网栅的设计[J]. 强激光与粒子束, 2011, 23(8): 2047. Liu Jun, Liu Jin, Guan Yonghong, Jing Yuefeng. Design of MeV anti-scatter grid in flash radiography[J]. High Power Laser and Particle Beams, 2011, 23(8): 2047.