遠紫外光子計數(shù)成像探測器分辨率及計數(shù)率的優(yōu)化
發(fā)布時間:2018-11-16 17:27
【摘要】:基于遠紫外(FUV)成像光譜儀對所用光子計數(shù)成像探測器高計數(shù)率、高空間分辨率的要求,研制出使用感應電荷位置靈敏陽極的FUV波段二維光子計數(shù)成像探測器原理樣機,該探測器主要由工作在脈沖計數(shù)模式下的微通道板(MCP)堆、楔條形(WSA)感應位敏陽極及相關(guān)的模擬和數(shù)據(jù)處理電路組成。感應電荷WSA陽極探測器的分辨率主要由前端模擬電路的信噪比決定,而信噪比與整形放大器的整形時間有關(guān),整形時間越長,信噪比越高,模擬電路的輸出計數(shù)率越低。測量了整形時間分別為0.25、0.5、1、2、4μs條件下探測器的分辨率及計數(shù)率,測量結(jié)果表明探測器的分辨率為3~9lp/mm,最高計數(shù)率為11~105kcounts/s,只有0.5μs整形時間放大器能滿足FUV成像光譜儀對分辨率和最高計數(shù)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.
【作者單位】: 中國科學院長春光學精密機械與物理研究所;
【基金】:國家自然科學基金(61275152) 吉林省科技發(fā)展重大項目(20116013)
【分類號】:TH744.1
[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.
【作者單位】: 中國科學院長春光學精密機械與物理研究所;
【基金】:國家自然科學基金(61275152) 吉林省科技發(fā)展重大項目(20116013)
【分類號】:TH744.1
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