摘要
微孔光学阵列聚焦镜头是实现X射线探测系统高探测效率、轻小型化的有效手段,近年来得到了深入研究。X射线探测系统通过测量脉冲星辐射的X射线光子的到达时间,重构脉冲轮廓来实现航天器导航。为了获得更精确的脉冲星信号,必须尽可能多地收集X射线光子,因此探测系统的聚焦性能是X射线探测系统的核心指标,也是微孔光学阵列主要的设计目标。文章根据脉冲星能谱的分布特点,分析了微孔光学阵列通道长宽比对X射线聚焦性能的影响,提出了针对不同脉冲星选取特定长宽比的方法,实现了不同的脉冲星能谱分布下最优的聚焦效率,为后续微孔光学阵列的研制和工程搭载提供了参考。基于这种方法,文章对Crab脉冲星的能谱分布进行了微孔光学阵列设计,设计结果显示,其聚焦性能得到明显提高。
The focusing lens based on micro plate optics is a new effective method to achieve X-ray detection system with high detection efficiency, light weight and miniaturied volumn, which has been paid more and more attention to. Spacecraft navigation is based on pulsar pulse time of arriving and reconstruction of pulsar profile, X-ray photons should be collected as many as possible to achieve highly-accurate pulsar signal. Accordingly, focusing efficiency is the core factor of X-ray detection system and the main design objective of micro plate optics. This article investigates the influence of channel ratio of micro plate optics on focusing performance for different pulsar X-ray sources. A practical method for design of micro plate optics at different energy spectrum distribution is proposed, which brings higher focusing efficiency. This method provides an important basis for future research and engineering. Based on this method, the case of Crab pulsar has been studied, the results show that the focusing performance of detection system is improved prominently.
出处
《航天返回与遥感》
北大核心
2015年第3期69-77,共9页
Spacecraft Recovery & Remote Sensing
