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中子边缘增强效应是近年来发展的基于中子波动性的新型中子成像技术.相较于传统的中子照相技术利用样品中不同元素对中子衰减能力的差别来得到样品内部的结构潜像,边缘增强效应成像利用中子射线穿过物体时各种元素对中子的折射率不同来反映物体的内部结构.为研究中子边缘增强效应成像的实际工业应用可行性,通过数值模拟方法分析了边缘增强效应的产生过程,并基于反应堆进行了不同条件下的多色热中子边缘增强效应成像实验.模拟与实验结果表明在适当准直比条件下,铝材料边缘将出现明显的边缘增强效应,该效应与准直比、样品与转换屏之间的距离密切相关.
The neutron edge enhancement effect is a new neutron imaging technique based on neutron volatility developed in recent years.Compared with the traditional neutron imaging technique, the difference in the decay ability of different neutrons in the sample can be used to obtain the structural latent in the sample Edge enhancement imaging uses neutron refractive index to reflect the internal structure of the object when the neutron beam passes through the object.In order to study the practical application of neutron edge enhancement imaging in industrial applications, the numerical simulation method The generation process of edge enhancement effect is analyzed and the multi-color thermal neutron edge enhancement effect imaging experiment under different conditions is carried out based on the reactor.The simulation and experimental results show that the edge of aluminum material will appear obvious edge under appropriate alignment conditions The enhancement effect, which is closely related to the collimation ratio and the distance between the sample and the conversion screen.