在微聚焦X射线以及等离子体X射线源平台上开展了多层球壳靶丸的相衬成像实验.实验结果表明,通过相衬成像能够获得清晰的多层球壳靶丸图像并观察到球壳内外表面晕区暗区现象.根据光的折射原理解释了该晕区暗区现象产生的物理机制.实验结果与几何模型计算结果符合较好.%X-ray phase contrast imaging experiments have been performed on micro-focus X-ray facility and Shenguang-Ⅱ laser driven plasma X-ray source. The Halo and dark zones at capsule shell interface have been found. Our work proposed the principle of light refraction to explain the halo and dark zones, and acquires the theoretic width of the halo and dark zones by sphere model and geometry optics. The theoretic width accords well with the experimental results. Thus, phase contrast imaging has an advantage over absorption imaging in low-Z material sample, and the halo and dark zones are very useful for precise diagnoses in low-Z material interface.
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