Xie Honglan, Luo Hongxin, Du Guohao, Zhao Chengqiang, Xu Wendong, Zhou Guangzhao, Chen Rongchang, Xiao Tiqiao
Shanghai Synchrotron Radiation Facility (SSRF), Shanghai Institute of Applied Physics, Chinese Academy of Sciences, Shanghai, People's Republic of China.
Shanghai Institute of Optics and Fine Mechanics, Chinese Academy of Sciences, Shanghai, People's Republic of China.
J Synchrotron Radiat. 2019 Sep 1;26(Pt 5):1631-1637. doi: 10.1107/S1600577519010075. Epub 2019 Aug 23.
Indirect X-ray imaging detectors consisting of scintillator screens, long-working-distance microscope lenses and scientific high-speed complementary metal-oxide semiconductor (CMOS) cameras are usually used to realize fast X-ray imaging with white-beam synchrotron radiation. However, the detector efficiency is limited by the coupling efficiency of the long-working-distance microscope lenses, which is only about 5%. A long-working-distance microscope lenses system with a large numerical aperture (NA) is designed to increase the coupling efficiency. It offers an NA of 0.5 at 8× magnification. The Mitutoyo long-working-distance microscope lenses system offers an NA of 0.21 at 7.5× magnification. Compared with the Mitutoyo system, the developed long-working-distance microscope lenses system offers about twice the NA and four times the coupling efficiency. In the indirect X-ray imaging detector, a 50 µm-thick LuAG:Ce scintillator matching with the NA, and a high-speed visible-light CMOS FastCAM SAZ Photron camera are used. Test results show that the detector realized fast X-ray imaging with a frame rate of 100000 frames s and fast X-ray microtomography with a temporal sampling rate up to 25 Hz (25 tomograms s).
由闪烁体屏幕、长工作距离显微镜镜头和科学高速互补金属氧化物半导体（CMOS）相机组成的间接X射线成像探测器通常用于利用白光同步辐射实现快速X射线成像。然而，探测器效率受到长工作距离显微镜镜头耦合效率的限制，该耦合效率仅约为5%。设计了一种具有大数值孔径（NA）的长工作距离显微镜镜头系统以提高耦合效率。它在8倍放大率下提供0.5的数值孔径。三丰长工作距离显微镜镜头系统在7.5倍放大率下提供0.21的数值孔径。与三丰系统相比，所开发的长工作距离显微镜镜头系统的数值孔径约为其三丰系统的两倍，耦合效率为其四丰系统的四倍。在间接X射线成像探测器中，使用了与数值孔径匹配的50 µm厚的LuAG:Ce闪烁体以及高速可见光CMOS FastCAM SAZ Photron相机。测试结果表明，该探测器实现了100000帧/秒的快速X射线成像以及高达25 Hz（25张断层图像/秒）的时间采样率的快速X射线显微断层成像。
