理论分析了利用X射线同轴离焦相衬成像法测量金黑腔内塑料中心微球位置的可行性, 在此基础上进行了实验研究。实验结果证明, 由于低Z低密度材料对高能X射线有相位调制作用, 因此仍能够形成一定的图像反差, 这种效应并不依赖X射线的能量, 因此在一定的尺度范围内, 可以实现高Z高密度材料与低Z低密度材料在高能X射线下同时成像, 克服了传统吸收成像的不足, 最终实现了内爆靶装配参数的精密检测。

The feasibility of measuring the location of the plastic microsphere in the gold hohlraum target by using coaxial-of-focus X-ray phase contrast imaging was theoretically analyzed, based on which an experiment was carried out. The experimental results show that, due to the phase modulation of low Z and low-density materials to high energy X-ray, a certain image contrast could be formed. This effect is independent on X-ray energy, so in a certain range of sizes,simultaneous imaging of high Z high-density and low Z low-density materials in the high-energy X-ray is achieved, which overcomes the shortcomings of traditional absorption imaging. The precision assembly parameters measurement of implosion target is realized.