發(fā)射光譜層析算法研究及其三維流場重建應用.pdf

1、南京航空航天大學博士學位論文發(fā)射光譜層析算法研究及其三維流場重建應用姓名：萬雄申請學位級別：博士專業(yè)：測試計量技術及儀器指導教師：于盛林20040901發(fā)射光譜層析算法研究及其三維流場重建膨用TheoreticalStudyonEmissionSpectralTomographyAlgorithmsanditsApplicationtoThree—dimensionalFluidFieldReconstructionsAbstractO

2、pticalComputedTomography(OCT)isabranchofComputedTomography，whichisatestingtechniquenotdisturbingthedistributionofthefieldstobereconstructedOCTshowssuperioritiesintestingthermophysicalparametersanddiagnosingplasmaEspecial

3、lyinphysicalparametersreconstructionofthethree—dimensionalfluidfieldsOCTisalmostthebesttechniquethatcan’tbereplacedbyotherapproachesEmissionspectraltomography(EST)ispracticableandonlyneedssimpledevices，whichisthecombinat

4、ionoftheemissionspectralmeasurementwithOCTandcanbewidelyusedinmechanism，metallurgy，energysources，aeronautics，andastronautics，etcTheapplicationofESTtechniqueisalwaysadifficultproblemintheworldThemainproblemsarethatontheon

5、ehand，itisdifficulttoobtaintheprecisedataofemissionintensityofmultiorientationsandwavelengths，whichneedsahighprecision，afastmechanicalscanningdevice，andfastresponseoptoelectronicsensorsforatestingsystem；ontheotherhand，bo

6、thinparallelbeamCTandfanbeamCT，itishardforESTtogaintransientemissiondatafromalotofangels，therefore，thealgorithmsofESTneedtobeapplicabletolimited—viewandincompletedataconditionsFirstlyfocusingonreconstructionproblemsofEST

7、withincompletedata，detailedstudiesonthetraditionalOCTalgorithms，includingtransformbasedandseriesexpansion—basedalgorithms，wereaccomplished；influencesofvariousparametersonreconstructionprecisionoftraditionalalgorithmswere

8、analyzed，whichprovidesatheoreticalfoundationforimprovingtheperformanceofthesealgorithmswithincompletedataOnthebasisofabovestudies，somenewalgorithms，whichareapplicabletotheincompletedatacondition，havebeenproposedinthisdis