Penumbral imaging and numerical evaluation of large area source neutron imaging system

作     者：YueLei Wu HuaSi Hu BoPing Zhang LinBo Li Da Chen Qing Shan Jie Zhu 

作者机构：School of Nuclear Science & Technology Xi’an Jiaotong University Xi’an 710049 China Institute of Nuclear Physics and Chemistry China Academy of Engineering Physics Mianyang 621900 China College of Material Science and Technology Nanjing University of Aeronautics and Astronautics Nanjing 210016 China Xi’an Research Institute of Hi-Tech Xi’an 710025 China 

出 版 物：《Science China(Technological Sciences)》 (中国科学（技术科学英文版）)

年 卷 期：2009年第52卷第9期

页      面：2567-2575页

核心收录：

学科分类：0810[工学-信息与通信工程] 08[工学] 080401[工学-精密仪器及机械] 0804[工学-仪器科学与技术] 080402[工学-测试计量技术及仪器] 0835[工学-软件工程] 081002[工学-信号与信息处理] 

基　　金：Supported by the NSAF Joint Fund set up by NSFC and CAEP (Grant No. 10576022) 

主　　题：penumbral imaging reconstruction unit source spatial invariance spatial resolution MCNP code 

摘      要：The fusion neutron penumbral imaging system Monte Carlo model was established. The transfer functions of the two discrete units in the neutron source were obtained in two situations: Imaging in geometrical near-optical and real situation. The spatial resolutions of the imaging system in two situations were evaluated and compared. The penumbral images of four units in the source were obtained by means of 2-dimensional (2D) convolution and Monte Carlo simulation. The penumbral images were reconstructed with the same method of filter. The same results were confirmed. The encoding essence of penumbral imaging was revealed. With MCNP(Monte Carlo N-particle) simulation, the neutron penumbral images of the large area source (200 μm×200 μm) on scintillation fiber array were obtained. The improved Wiener filter method was used to reconstruct the penumbral image and the source image was obtained. The results agree with the preset neutron source image. The feasibility of the neutron imaging system was verified.