12MeV LIA X射线斑点测试及其调制传递函数

摘要: 介绍了测试12MeV LIA X光斑点的测试系统，利用刀口法和大孔成像法测出所成像的黑密度分布, 获得X光斑点大小结果; 根据该光源的近乎轴对称特点和大孔所成像的密度分布，经数值处理拟合出斑点强度的空间分布；利用该系统，获得了判断12MeV LIA X光成像空间分辨能力的调制传递函数。

Abstract: The measurement system of Xray spot size for the 12MeV LIA is described in this paper. The Xray spot size and modulation transfer function, which judges the space resolution of 12MeV LIA Xray image, for the 12MeV LIA can be obtained using this system. According to the characteristic of approximate axial symmetry of Xray source and the distribution of image black density, the spa ce distribution of spot intensity is also imitated．