一种基于石墨烯电场效应的软X射线探测器

A Soft X-ray Detector Based on Electric Field Effect of Graphene

针对脉冲星导航对软X射线探测的实际要求,研究分析了一种基于石墨烯电场效应的软X射线探测器的性能。通过理论计算,并利用COMSOL Multiphysics有限元仿真软件,给出了探测器时间分辨率和能量分辨率的估值公式。在5.9keV软X射线入射硅吸收层的情况下,时间分辨率的理论值可达7.2ns,能量分辨率的理论值约为90eV(1.5%)。结果表明,该探测器能够初步满足脉冲星软X射线的探测需求。

In view of the requirements of X-ray detection in pulsar-based navigation,the performance of a soft X-ray detector based on electric field effect of graphene is studied.The formula of time resolution and energy resolution of the detector is given by theoretical calculation and COMSOL Multiphysics simulation software.When the soft X-ray of 5.9 keV is incident on the silicon absorption layer,the theoretical value of the time resolution is about 7.2 ns and the theoretical value of the energy resolution is about 90 eV（1.5%）.The results show that the detector can meet the basic requirement of X-ray detection in pulsar-based navigation.