远紫外光子计数成像探测器分辨率及计数率的优化

发布时间：2018-11-16 17:27

【摘要】：基于远紫外(FUV)成像光谱仪对所用光子计数成像探测器高计数率、高空间分辨率的要求,研制出使用感应电荷位置灵敏阳极的FUV波段二维光子计数成像探测器原理样机,该探测器主要由工作在脉冲计数模式下的微通道板(MCP)堆、楔条形(WSA)感应位敏阳极及相关的模拟和数据处理电路组成。感应电荷WSA阳极探测器的分辨率主要由前端模拟电路的信噪比决定,而信噪比与整形放大器的整形时间有关,整形时间越长,信噪比越高,模拟电路的输出计数率越低。测量了整形时间分别为0.25、0.5、1、2、4μs条件下探测器的分辨率及计数率,测量结果表明探测器的分辨率为3~9lp/mm,最高计数率为11~105kcounts/s,只有0.5μs整形时间放大器能满足FUV成像光谱仪对分辨率和最高计数率的要求。
[Abstract]:Based on the requirement of high counting rate and high spatial resolution of photon counting imaging detector used in far ultraviolet (FUV) imaging spectrometer, the principle prototype of two-dimensional photon counting imaging detector in FUV band using inductive charge position sensitive anode is developed. The detector consists of a microchannel plate (MCP) stack operating in pulse counting mode, a wedge-shaped (WSA) inductive position-sensitive anode, and related analog and data processing circuits. The resolution of the inductive charge WSA anode detector is mainly determined by the signal-to-noise ratio of the front-end analog circuit, and the SNR is related to the shaping time of the shaping amplifier. The longer the shaping time is, the higher the SNR is, and the lower the output counting rate of the analog circuit is. The resolution and counting rate of the detector were measured when the shaping time was 0.25 ~ (0.5) ~ (-1) ~ (-1) ~ (-1) ~ (2) 渭 s, respectively. The results showed that the resolution of the detector was 3 ~ (9) lp / mm, and the highest counting rate was 11 ~ (10 ~ 5) kcounts / s. Only 0.5 渭 s shaping time amplifier can meet the requirements of FUV imaging spectrometer for resolution and maximum counting rate.
【作者单位】：中国科学院长春光学精密机械与物理研究所;
【基金】：国家自然科学基金(61275152) 吉林省科技发展重大项目(20116013)
【分类号】：TH744.1

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