对数螺旋型劳厄弯晶的X射线单色成像应用

Logarithmic Spiral Bent Laue Crystals for X-Ray Monochromatic Imaging Applications

利用劳厄晶体研究了X射线的单色衍射性质,研究了对数螺旋型劳厄弯晶在等离子体X射线单色成像中的应用。根据光线追迹原理及对数螺旋线的表面方程,研究了对数螺旋型劳厄弯晶的单色成像原理,分析了单色衍射像不受透射白光X射线影响的准则,以及子午、弧矢放大倍数和单色成像视场等性能参数。研制了石英晶体(1010)对数螺旋劳厄弯晶分析器,以铜靶X射线源作为背光源,对网丝直径为50μm的金属网格进行了单色背光成像实验。实验结果表明,当背光源尺寸为110μm时,对数螺旋型劳厄弯晶的空间分辨力约为11.9μm,分析器在子午和弧矢方向的视场分别达到22.3557mm和8.2602mm。

Taking advantages of the monochromatic X-ray diffraction property of Laue crystals, an innovative use of logarithmic spiral bent Laue crystals for X-ray monochromatic imaging is investigated. According to the ray tracing method and the surface equation of the logarithmic spiral, the imaging principles and characteristics of the logarithmic spiral bent Laue crystals are studied, including the condition that the diffracted beam can be separated from the transmitted beam, the magnifications and the field of view （FOV）. A logarithmic spiral bent quartz （1010） Laue crystal analyzer is developed. With the proposed crystal analyzer, the monochromatic backlight imaging experiment for the mesh grid with a diameter of 50μm is carried out by taking an X-ray source of Cu target as the backlighter. The experimental results show that the spatial resolution of the analyzer is approximately 11.9 μm under a source diameter of 110μm Furthermore, the FOVs of the crystal analyzer are 22. 3557 mm and 8. 2602 mm in horizontal and vertical directions, respectively.