远紫外光子计数成像探测器分辨率及计数率的优化.pdf

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1、第34卷第8期光学学报Vo1．34，No．82014年8月ACTA0PTICASINICAAugust，2014远紫外光子计数成像探测器分辨率及计数率的优化尼启良(中国科学院长春光学精密机械与物理研究所，吉林长春130033)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

2、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、4s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0．5s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。关键词探测器；远紫外；微通道板；光子计数成像探测器；感应电荷楔条形位置灵敏阳极中图分类号0433．1；TH744．1文献标识码Adoi：10．3788／AOS2o1434．0804001Opt

3、imizationforSpatialResolutionandCountRateofaFarUltravioletPhoton·CountingImagingDetectorBasedonInducedChargePosition．SensitiveAnodeNiQiliang(ChangchunInstituteofOptics，FineMechanicsandPhysics，ChineseAcademyofSciences，Changchun，Jilin130033，China)AbstractAnewprototypeoftwo—di

4、mensionalphoton—countingimagingdetectorwithinducedchargeWSAanodeinfarultraviolet(FUV)regionhasbeendevelopedbasedontheFUVimagingspectrometerSrequirementsonhighoutputcountrateandspatialresolution．ThedetectorismainlycomposedofaCsIChevronmicrochannelplate(MCP)stacksoperatinginp

5、ulse—countingmode，induced—chargewedge—stripposition—sensitiveanode(WSA)andcorrelativeanaloganddataprocessingcircuit．Athreeelectrodeinduced-chargeWSAanodewith48mmdiameteractiveareaisdesignedandfabricated．andfront—endanaloganddatacollectioncircuitarealsobeendeveloped．Thespace

6、resolutionforinduced—chargeWSAanodedependsonthesignal-to—noiseratio(SNR)offront-endanalogcircuit，whiletheSNRisrelativetotheshapingtimeofshapingamplifier．Thelongeristheshapingtime，thehigheristheSNR，andtheloweristhemaximumoutputrateofthefront—endanalogcircuit．Bothresolutionan

7、dmaximumcountratearemeasuredfordifferentshapingtimesuchas0．25，0．5，1，2and4bts．Themeasuredresultsshowthattheresolutionisbetween4lp／mmand9lp／mm。andmaximumoutputrateisbetween11kcounts／sand105kcounts／s．Theshapingamplifierwith0．5ptsshapingtimecanonlycompletelysatisfytherequiremen

8、tofFUVimagingspectrometeronthespatialresolutionandmaximumoutputrate．Keywordsdetect