基于布拉格反射镜的X射线多色单能成像谱仪

报道了一种基于布拉格反射镜的多色单能成像谱仪研制工作，谱仪由针孔阵列、布拉格反射镜和CCD相机组成.大约有300个微孔的针孔阵列板置于布拉格镜前用于空间成像，通过布拉格反射镜的单色化，投射到CCD上的数百个小孔成像沿色散方向获得了能量分辨.经过图像处理，可以还原得到目标的多色单能二维成像.根据采用的布拉格分光元件和图像还原方法，谱仪的能量分辨达到了50—200（λ/Δλ）；针孔成像的空间分辨优于10 μm.同时还为该谱仪开发了专门的单能图像重建软件及图像数据后处理软件，可以在任意选择的窄能带内还原准单能图像.并重点介绍了该谱仪的优化设计、获得的技术指标以及专门研制的超短周期（2.5 nm）X射线W/B₄C多层镜. 关键词： X射线光学 诊断技术 布拉格反射镜 X射线多层镜

A multiple monochromatic X-ray imaging spectrometer based on flat Bragg mirror

Development of an multiple monochromatic X-ray imager based on flat Bragg mirror has been reported, The instrument consists of a pinhole array,a Bragg mirror,and a X-ray CCD camera.An array of approximately 300 pinhole in front of a flat Bragg mirrors projects hundreds of images onto the CCD camera afer reflection off the Bragg mirror,which introduces spectral dispersion along the reflection axis. This spectrometer has a spectral resolution of 50—200 （λ/Δλ） according to the Bragg device and processing technique for systematic reconstruction of quasimonochromatic image.Spatial resolution of 10um is achieved by combining it with pinhole imaging system.Specialism software package have been developed for systematic reconstruction an post date processing,it could restructure an image with flexible spectral bandwidth selection.The article mainly emphasizes the characteristic, optimization design of the spectrometer and the specialized X-ray W/B₄C multilayer mirror with depth-graded interplannar spacing centered at 2.5 nm.