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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。
Based on the requirement of high count rate and high spatial resolution of the photon counting imaging detector used by far ultraviolet (FUV) imaging spectrometer, a prototype prototype of FUV band two-dimensional photon counting imaging detector using sensitive charge position sensitive anode was developed. The detector Mainly by the micro-channel plate (MCP) reactor working in pulse counting mode, wedge-shaped (WSA) sensing bit sensitive anode and related analog and data processing circuit. Inductive charge WSA anode detector resolution mainly by the front-end analog signal to noise ratio of the decision, and the signal to noise ratio and shaping the plastic shaping time, the longer shaping time, the higher the signal to noise ratio, the analog circuit output count rate low. The resolution and counting rate of the detector under the condition of shaping time of 0.25, 0.5, 1, 2, 4μs were measured respectively. The measurement results showed that the resolution of the detector was 3 ~ 9lp / mm and the highest counting rate was 11 ~ 105kcounts / s , Only 0.5μs shaping time amplifier to meet the FUV imaging spectrometer resolution and maximum count rate requirements.