Müller O, Lützenkirchen-Hecht D, Frahm R
Bergische Universität Wuppertal, Gaußstraße 20, Wuppertal 42119, Germany.
Rev Sci Instrum. 2015 Mar;86(3):035105. doi: 10.1063/1.4913900.
A fast X-ray chopper capable of producing ms long X-ray pulses with a typical rise time of few μs was realized. It is ideally suited to investigate the temporal response of X-ray detectors with response times of the order of μs to ms, in particular, any kind of ionization chambers and large area photo diodes. The drive mechanism consists of a brushless DC motor and driver electronics from a common hard disk drive, keeping the cost at an absolute minimum. Due to its simple construction and small dimensions, this chopper operates at home lab based X-ray tubes and synchrotron radiation sources as well. The dynamics of the most important detectors used in time resolved X-ray absorption spectroscopy, namely, ionization chambers and Passivated Implanted Planar Silicon photodiodes, were investigated in detail. The results emphasize the applicability of this X-ray chopper.
实现了一种快速X射线斩波器，它能够产生持续时间为毫秒级的X射线脉冲，典型上升时间为几微秒。它非常适合用于研究响应时间在微秒到毫秒量级的X射线探测器的时间响应，特别是任何类型的电离室和大面积光电二极管。驱动机构由一个无刷直流电机和来自普通硬盘驱动器的驱动电子设备组成，将成本保持在绝对最低水平。由于其结构简单、尺寸小，这种斩波器也可在基于家庭实验室的X射线管和同步辐射源上运行。详细研究了时间分辨X射线吸收光谱中使用的最重要探测器，即电离室和钝化注入平面硅光电二极管的动力学特性。结果强调了这种X射线斩波器的适用性。
