光电子放大的X射线全息实时成像系统

A photoelectron amplified X-ray holographic imaging system

本文介绍一种将同步辐射X射线成像与电子光学显微技术结合起来的实时记录方法。通过加速阳极对电子束的加速,控制其波长,再经过一个中心对称的电磁透镜系统的放大,最后到达CCD记录并输出,通过计算机实时重构出高分辨率的显微图像。该放大系统还可以应用到同步辐射的X射线相衬、显微和层析方面。对同步辐射应用技术的发展将产生不可估量的影响。

A layout of the photoelectron amplified X-ray holographic imaging system at synchrotron radiation facility is presented in this paper. By using a photocathode and electromagnetic lenses placed at the X-ray interference area, the hologram is transferred into electron hologram and amplified by the electromagnetic lenses afterward. It reduced the resolution requirement for the recording medium greatly. The hologram is capable of being recorded by CCD and then the images can be reconstructed on real time. This technology can also be used in X-ray phase contrast imaging. It will be a promising means to detect super-short dynamic process at nanosecond level if the photoelectron is derived from super short X-ray pulses in synchrotron radiation.