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ID:34127756
大小:2.39 MB
页数:53页
时间:2019-03-03
《大气co2甚高光谱分辨率成像光谱仪光学设计》由会员上传分享,免费在线阅读,更多相关内容在行业资料-天天文库。
1、英文摘要大气CO2甚高光谱分别率成像光谱仪分析与光学设计OpticalDesignofImagingSpectrometerwithVeryHighSpectralResolutionandforAtmosphericCO2DetectionAbstractCO2isthemostimportantgreenhousegases.Inrecentdecades,climateproblemduetoitsincreasingemissionhasbecomeoneofmajorandgloballyconcernedenvironmentalpr
2、oblems.Inordertostudyitseffectsonglobalclimatechangeandecosystem,itisnecessarytomeasurespatialandtemporalchangesofatmosphericCO2ontheglobalscalewithhighaccuracy.Inthisthesis,opticalsystemofimagingspectrometerbeingspaceborneonlowcostmini-satellitesisstudiedforthispurpose.First
3、ly,theprincipleofremotelymeasuringtheatmosphericCO2columnconcentrationisintroduced.Throughanalysisoftherelationshipamongmeasurementaccuracy,spectralresolutionandtherequiredsignaltonoiseratio(SNR)withhelpoftheLine-By-LineRadiativeTransferModel(LBLRTM),theseperformancesandthent
4、herelativeapertureandotherspecificationsoftheinstrumentaredetermined.Basedontheproposedspecificationsandminiaturizationrequirement,animagingspectrometerschemecomposedofaSchwarzchildtelescopeandanoff-axisThree-Mirroranastigmat(TMA)Littrowspectroscopicmountwithanimmersionechell
5、egratingisstudied.Theopticalpathsofitsthreebandssharethesameopticalsystem,andsoitiscompact.Then,startingfromthehalfofTMALittrowmountduetoitssymmetry,itsinitialconfigurationparametersaresolvedwithitsprimaryaberrationformula.ThecompactopticalsystemofimagingspectrometerwithF/4an
6、d21000spectralresolvingpowerisdesignedwiththecommercialopticaldesignsoftware.Inordertoreducesizeoftheimagingspectrometer,theprincipleandmethodofimmersiongratingimprovingspectralresolvingpowerandreducingspectroscopicmountsizearestudiedandanalyzed.Studyandopticaldesignshowthats
7、izeofspectroscopicmountwithanimmersionechellegratingreducedto40%oftheoriginal.Finally,tolerancesofthedesignedimmersionechellegratingopticalsystemareoptimallyallocated.Theallocationresultsinlinewithactualprocessingrequirementsareacquired.Bafflestructuresaredesigned,andstraylig
8、htanalysisshowsthatthesystemhasII大气CO2甚高光谱分辨率成像光谱仪光学设计英文摘要lowstrayli
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