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| 平行式Schmidt型龙虾眼X射线光学系统研究 |
| Study on lobster eye X-ray optical system based on parallel Schmidt geometry |
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| DOI： |
| 中文关键词: 龙虾眼系统 Schmidt结构 X射线聚焦 视场 |
| 英文关键词:lobster-eye system Schmidt geometry X-ray focusing field of view(FOV) |
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| 中文摘要: |
| 龙虾眼X射线系统是实现大视场X射线成像的有效手段。现研制了由多组平行玻璃平板构成的Schmidt型X射线龙虾眼光学系统,开展了X射线聚焦和成像的演示实验。基于掠入射反射理论,以210 μm厚的超光滑平板玻璃作为光学元件,通过堆叠的方式制作了放大倍数为1的演示系统。用8 keV的X射线光源对系统进行了聚焦和实验,直径280 μm的光源聚焦半高宽约为320 μm,与理论模拟结果基本一致。利用X射线背光照明,得到2 mm×2 mm大小图样的成像。实验结果表明,该龙虾眼光学系统可以在几毫米视场下达到百微米分辨。 |
| 英文摘要: |
| Lobster-eye X-Ray system is an effective method to achieve X-ray imaging with a large field of view. A lobster eye X-ray optical system is designed based on Schmidt geometry using parallel glass plate and X-ray focusing and imaging demonstration experiment is carried out. Based on the principle of grazing incidence reflection, a demonstration system with a unit magnification was made through stacking the flat thin glasses of 210 μm with ultra-smooth surface. Experiment of X-ray focusing was carried out using 8 keV X-ray source and a pinhole with diameter of about 280 μm. A full-width at half-maximum of about 320 μm was achieved which is almost the same with the ray tracing result. Then, the imaging ability of the system was also tested using a pattern of about 2 mm×2 mm through X-ray backlighting. The results show that this lobster eye system can get a resolution of hundred microns under the FOV of a few millimeters. |
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