中子照相系统整体空间分辨率计算与分析  

Calculation and analysis of the neutron radiography spatial resolution

作　　者：贺林峰[1] 韩松柏[1] 王雨[1] 魏国海[1] 武梅梅[1] 王洪立[1] 刘蕴韬[1] 陈东风[1] 

机构地区：[1]中国原子能科学研究院核物理所中核集团中子散射应用技术重点实验室,北京102413

出　　处：《核技术》2014年第4期52-57,共6页Nuclear Techniques

基　　金：国家重点基础研究发展计划项目(No.2010CB833106);国家自然科学基金(No.11375271);中国原子能科学研究院院长基金--青年英才培育基金(No.16YC-201302,No.16YC-201303)资助

摘　　要：本文综合考虑几何不锐度和探测系统固有不锐度的影响,把准直比、样品与转换屏间距离、转换屏和CCD(CMOS)相机分辨率等关键参数引入到系统脉冲响应函数,推导出更准确和全面的中子照相系统整体空间分辨率计算公式,探讨了公式中各参数与分辨的定量关系和影响规律。利用该公式对中国先进研究堆实时中子成像探测系统在不同准直比条件下的整体空间分辨率进行了计算与分析,讨论了如何优化调整各影响因素以提高中子照相装置的整体测试性能。为中子照相装置的优化设计以及确定特定样品的测试方案,提供了重要的理论依据。Background： Spatial resolution is the key parameter for neutron radiography facility. A model of the integrated system resolution is important when designing or using a system to ensure that the realistic resolution goals can be established and achieved. Purpose： For this resolution modeling analysis we focused on the effects of the geometry effects of L/D, the optical diffusion response of the scintillator and the sampling at the sensor （CCD or CMOS camera） and a formula was derived indicating their functional relationship. Methods： This resolution modeling analysis has been down by theoretic calculations. Then this integrated system resolution model was used as an empirical methodology to verify and optimize the performance of the detection system for real-time neutron radiography at China Advance Research Reactor. Results： The special resolutions at very collimation conditions have been calculation by using this method. And three of important parameters of this resolution model have been discussed to optimize the system performance. Conclusion： These resolution analysis concepts and methods will benefit both the design and the characterization of radiography systems.

关 键 词：中子照相 空间分辨率 调制解调函数 

分 类 号：TL99[核科学技术—核技术及应用]