物理学报2025，Vol.74Issue(17)：64-73,10.DOI:10.7498/aps.74.20250512
台式X射线系统多光栅调制屏设计与特性
Design and characteristics of multi-grating modulation screen for desktop X-ray system
摘要
Abstract
The desktop X-ray system has limitations such as low flux and poor coherence.It faces great challenges in application scenarios such as microscopic imaging and high-precision measurement.Fourier-transform ghost imaging(FGI)has low requirements for the coherence of the light source.Using this principle,multi-angle FGI based on spatial correlation can effectively improve the imaging efficiency and is suitable for desktop X-ray systems.However,this technology is still in the theoretical stage,and there is a lack of effective devices to modulate X-rays and form focused multiple beams.To this end,a multi-grating modulation method is proposed in this work.The partially coherent radiation of the X-ray source is modulated by arranging multiple sub-gratings in a specific direction.The X-ray emitted by a single sub-grating is spatially coherent light,and the X-rays between the sub-gratings are incoherently superimposed at the sample position to form a focused multi-angle beam.This effectively improves the flux utilization of the desktop system.The modulation principle of multi-grating is described theoretically,and the key design parameters and their selection basis are clarified.Through numerical simulation,the modulation characteristics of partially coherent X-rays in the propagation process behind the modulation screen are systematically analyzed.By optimizing the parameters such as the size,material and thickness of the sub-grating,the influences of the sub-grating on the size,uniformity and diffraction efficiency of the focused spot are investigated.The results show that when the sub-grating size matches the spatial coherence size of the X-ray source,the focusing effect of the beam can be significantly improved,and a smaller and uniform focal spot can be obtained.Based on the theoretical and simulation results,a gold multi-grating modulation screen is designed and fabricated for the liquid target X-ray source.The simulation and theoretical predictions will be validated experimentally,once the experimental conditions are met.The design and implementation of the modulation screen provide effective support and a feasible way for multi-angle diffraction imaging and related applications in miniaturized X-ray systems.关键词
台式X射线系统/多光栅调制屏/空间调制/衍射成像Key words
tabletop X-ray system/multi-grating modulation screen/spatial modulation/diffraction imaging引用本文复制引用
汪德,谈志杰,李晴宇,喻虹,韩申生..台式X射线系统多光栅调制屏设计与特性[J].物理学报,2025,74(17):64-73,10.基金项目
国家自然科学基金(批准号:11627811)资助的课题. Project supported by the National Natural Science Foundation of China(Grant No.11627811). （批准号:11627811）
