两块晶体衍射增强成像方法研究

在北京同步辐射装置4W1A光束线形貌学实验站用两块晶体开展了衍射增强成像方法的实验和理论研究.研究了晶体热膨胀对两块晶体衍射增强成像的影响,分析的结论表明,晶体转轴垂直于同步辐射偏振面能基本避免晶体热膨胀的影响,获得较好的成像质量.实验结果证实了分析的正确性. 关键词： 相位衬度成像 同步辐射 晶体衍射

Study on the methods for diffraction-enhanced imaging with two crystals

Diffraction_enhanced imaging by using two crystals has been recently developed i n x_ray topogrphy station in Beijing Synchrotron Radiation Facility. In this art icle the analysis for the influence of the thermal expansion of the first crysta l on the diffraction enhanced imaging is presented. The conclusion is that the i nfluence of the thermal expansion of the first crystal can be avoided and much b etter images can be obtained when the axes of crystals are placed vertically to the polarization plane of the synchrotron radiation. The experimental results co nfirmed this analysis.