激光驱动X射线单色背光照相系统优化设计
Optimum design of laser-driven-monochromatic X-ray backlighting system
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摘要: 基于球面几何光学对激光驱动X射线单色背光照相系统的空间分辨力和成像效率等关键性能参数进行了理论推导，分析了当系统光学参数发生变化时，系统空间分辨力和成像效率互为制约的关系，由此提出了在保证能探测到图像的前提下，尽量提高系统空间分辨能力的优化设计方法。按照此方法具体设计了光子能量分别为5.07 keV和5.41 keV的两套背光照相系统，并用光线追迹模拟实验进行了验证。结果表明：设计的两套系统都能够在大约1 cm2的视场范围内，具有优于10 μm的空间分辨力。Abstract: Theoretical expressions for the key performance parameters(spatial resolution and imaging efficiency, et al) of a laser-driven-monochromatic X-ray backlighting system were deduced and the relationship beteween these parameters were analyzed when the optical parameters varied. An optimum design method for the system was then proposed based on the maxmum of the spatial resolution ability with the constraint of obtaining a well image(the exposure intensity is greater than the sensitivity of the detector). Two backlighting systems with photon energy of 5.07 keV and 5.41 keV were designed using this method and the ray tracing results show that both systems can achieve a spatial resolution smaller than 10 μm in about 1 cm2 field of view.
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Key words:
- x-ray /
- plasma /
- backlighting /
- spherically bent crystal /
- spatial resolution /
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